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Showing papers on "Optical Carrier transmission rates published in 1997"


Journal ArticleDOI
TL;DR: In this article, the effects of fiber chromatic dispersion in fiber-wireless systems incorporating external modulators were investigated and the achievable link distance can be increased by varying the chirp parameter of the modulator to give large negative chirps using a dual-electrode Mach-Zehnder modulator biased at quadrature.
Abstract: We demonstrate two techniques to reduce the effects of fiber chromatic dispersion in fiber-wireless systems incorporating external modulators. We theoretically and experimentally show that the achievable link distance can be increased by varying the chirp parameter of the modulator to give large negative chirp using a dual-electrode Mach-Zehnder modulator (MZM) biased at quadrature. In addition, we show that dispersion can be almost totally overcome by implementing a simple method using the dual-electrode MZM to generate an optical carrier with single sideband (SSB) modulation. We demonstrate the transmission of a 51.8-Mb/s pseudorandom bit sequence (PRBS) at 12 GHz over 80 km of standard single-mode fiber using the SSB generator and measure a bit-error-rate (BER) power penalty due to fiber dispersion of less than 0.5 dB for a BER equal to 10/sup -9/.

748 citations


Journal ArticleDOI
TL;DR: In this article, a method for generating an optical carrier with single sideband modulation using a dual-electrode Mach-Zehnder modulator biased at quadrature is presented.
Abstract: The authors present a novel method for generating an optical carrier with single sideband modulation using a dual-electrode Mach-Zehnder modulator biased at quadrature. It is proposed and demonstrated experimentally that this simple technique can be used to reduce dispersion power penalties in fibre-radio systems.

464 citations


Patent
P. V. Mamyshev1
13 Jun 1997
TL;DR: In this paper, a return-to-zero data generator multiplies a non-return-tozero (NRZ) electrical data stream and a sinusoidal electrical signal to generate an RZ electrical signal.
Abstract: Apparatus and method for generating a return-to-zero (RZ) optical data stream. A laser or other continuous wave (CW) optical source generates an optical carrier signal which is applied to a phase modulator. A return-to-zero data generator multiplies a non-return-to-zero (NRZ) electrical data stream and a sinusoidal electrical signal to generate an RZ electrical data stream. The phase modulator modulates the RZ electrical data stream onto the optical carrier signal to generate a phase-modulated optical signal. A Stokes portion or an anti-Stokes portion of the phase-modulated optical signal spectrum is then spectrally separated in an optical filter to provide a corresponding output RZ optical data stream. The spectral separation may be provided using a discrete filter coupled to the output of the phase modulator, or using transmission line filtering in a soliton transmission system. The use of the phase modulator to perform data encoding operations avoids the modulation bias drift problems inherent in amplitude modulators.

55 citations


Patent
09 Apr 1997
TL;DR: In this article, a splitterless optical broadcast switch (110) includes an optical source (112) for generating a plurality of unmodulated optical carrier signals, and a first stage routing module (114) routes the plurality of unpaired optical carrier signal.
Abstract: A splitterless optical broadcast switch (110) for routing a plurality of optical carrier signals. The splitterless optical broadcast switch (110) includes an optical source (112) for generating a plurality of unmodulated optical carrier signals. A first stage routing module (114) routes the plurality of unmodulated optical carrier signals. A modulating module (116) receives a plurality of RF input signals and modulates each of the RF input signals onto any number of the unmodulated optical carrier signals to generate a plurality of modulated optical carrier signals. A second stage routing module (118) routes the plurality of modulated optical carrier signals complimentary to the first stage routing module (114). An output module (120) receives the plurality of modulated optical carrier signals such that the optical output from the optical source (112) is paired to a complimentary optical input of the output module (120).

54 citations


Journal ArticleDOI
TL;DR: In this paper, a novel transmitter design is used to optoelectronically combine baseband and subcarrier channels onto the optical carrier using a differential Mach-Zehnder (MZ) interferometer modulator.
Abstract: We report experimental and analytical results of a fiber-optic link that supports simultaneous transmission of baseband data and subcarrier multiplexed control-data channels. A novel transmitter design is used to optoelectronically combine baseband and subcarrier channels onto the optical carrier using a differential Mach-Zehnder (MZ) interferometer modulator. Microwave direct detection of the subcarrier data channel simplifies the receiver design and network architecture. An approach to optimize the transmitter parameters for a given transmitter/receiver configuration is presented, A discrete component link is implemented and its performance compared to analytical results and discrete-time simulations. Insertion of monolithic-microwave integrated-circuit (MMIC) technology is investigated by utilizing a MMIC mixer for control-channel upconversion and envelope detection in the link transmitter and receiver, respectively. High signal-to-noise ratio (SNR) of the control channel demonstrates that MMIC technology is a viable approach to integration of subcarrier multiplexed fiber links.

40 citations


Patent
21 Feb 1997
TL;DR: In this paper, mixing and modulating methods are described for nonlinear optical amplifiers which can generate intermodulation products of radiofrequency signals in an optical carrier signal without the penalty of an optical conversion loss and without the need for radiofrequency mixers, electro-optic modulators and expensive polarization-maintaining optical fibers.
Abstract: Mixing and modulating methods are described for nonlinear optical amplifiers (30) which can generate intermodulation products of radio-frequency signals in an optical carrier signal (26) without the penalty of an optical conversion loss and without the need for radio-frequency mixers, electro-optic modulators and expensive polarization-maintaining optical fibers. The radio-frequency signals can be applied to either a bias port (36) or an optical input port (32) of the optical amplifier and are used to upconvert and downconvert signals in phased-array antenna and remote antenna embodiments of the invention.

38 citations


Patent
14 Nov 1997
TL;DR: A channelizer for signals for optically channelizing RF signals modulated onto an optical carrier by optically separating the RF signals and mapping the RF signal by way of an optically dispersive element, such as a diffraction grating as mentioned in this paper.
Abstract: A channelizer for signals for optically channelizing RF signals modulated onto an optical carrier by optically separating the RF signals and mapping the RF signals by way of an optically dispersive element, such as a diffraction grating. In an alternate embodiment of the invention, two stages of optical filters elements are provided in series to perform sequential channelization. Bragg reflection gratings are used for coarse filtering into predetermined bands while Fabry-Perot filters tuned to specific sub-bands of the Bragg reflection gratings are used for channelization. In alternate embodiments of the invention, a silica planar waveguide and an optical splitting device, such as a Talbot splitter, are used.

36 citations


Journal ArticleDOI
TL;DR: In this article, a full-duplex, optical feeder network for wireless access operating at 39 GHz is presented, where the system transports 155 Mbit/s of data and three video channels downstream, and 51.8 M bit/s upstream over 40 km of standard singlemode fiber.
Abstract: A full-duplex, optical feeder network for wireless access operating at 39 GHz is presented. The system transports 155 Mbit/s of data and three video channels downstream, and 51.8 Mbit/s upstream over 40 km of standard singlemode fibre. The 39 GHz carrier signal was generated using a novel tripling technique which enables low frequency electronics and optical components to be implemented in the central office. The architecture also incorporates simple, low cost remote base-stations with no millimetre-wave upconverting mixers required. To further minimise cost, an LED was used as the optical source for upstream transmission.

27 citations


Patent
06 Feb 1997
TL;DR: In this article, the authors proposed an electro-optical modulation device consisting of a first Mach-Zehnder interferometric modulator with balanced optical power in each arm to intensity modulate an optical carrier signal in response to information signals.
Abstract: An electro-optical modulation device comprises a first Mach-Zehnder interferometric modulator. This modulator has balanced optical power in each arm to intensity modulate an optical carrier signal in response to an information signal. The invention also includes a second Mach-Zehnder interferometric modulator that is in a cascade connection with the first modulator and also has balanced optical power in each arm. This second modulator receives the optical carrier signal from the first modulator and also intensity modulates the optical carrier signal in response to the information signal. In another embodiment, the electro-optical modulation device comprises an electro-optical modulator, for intensity modulating an optical carrier in response to an electrical signal, and a reflective termination. The termination reflects the intensity modulated optical carrier signal to travel back through the electro-optical modulator. As a result, the modulation effect of the modulator is effectively-doubled. Either embodiment finds application in applications that involve bandwidths of less than one octave, for which the embodiments can be easily optimized. The best examples are links for remote antennas, the most notable exception being cable television. For these sub-octave-bandpass links, second-order distortion does not present a problem since these spurious signals fall outside the band of interest. As a result, the second-order distortion control constraint can be sacrificed in an effort to negate third-order distortion and remediate other problems. This trade-off is not available in broadband cable applications.

25 citations


Proceedings ArticleDOI
16 Feb 1997
TL;DR: In this paper, the cascadability performance of an arrayed waveguide grating multiplexer (AWGM) is evaluated theoretically and experimentally in a loop testbed showing the influence of passband narrowing, if the AWGM is well aligned to the optical carrier frequency.
Abstract: In this paper cascadability performance of an arrayed waveguide grating multiplexer (AWGM) is evaluated theoretically and experimentally in a loop testbed showing the influence of passband narrowing, if the AWGM is well aligned to the optical carrier frequency. At a certain value of frequency detuning of the (de)multiplexers passband, single-sideband amplitude-shift keying (ASK) transmission is obtained with better cascadability performance.

25 citations


Journal ArticleDOI
TL;DR: In this paper, a differential external integrated-optic modulator is proposed to combine the base-band and subcarrier multiplexed data onto an optical carrier. But the authors focus on the nonlinear modulator transfer function.
Abstract: We propose, analyze, and demonstrate a novel transmitter architecture for links that support transmission of base-band data and subcarrier multiplexed control channels. The architecture utilizes a differential external integrated-optic modulator to electrooptically combine the base-band and subcarrier multiplexed data onto an optical carrier. An analytical model is presented that allows optimization of the SNR of the received base-band and control data channels based on modulation parameters. This optimization is based on tradeoffs that result when the base-band and subcarrier channel are combined using a nonlinear modulator transfer function. We experimentally demonstrate a link based on this architecture with 2.5-Gb/s base-band and 100-Mb/s control data multiplexed on a 5.5-GHz subcarrier. Analytical and measured experimental results are compared and are shown to be in good agreement.

Patent
Jean-Pierre Weber1
29 Oct 1997
TL;DR: In this paper, an amplitude modulator is provided for amplitude modulating an optical carrier at high speed with signals to be transmitted, and a suppressing means is provided to suppress at least part of one of the side bands of the modulated carrier to reduce the effect of group velocity dispersion in the optical fiber.
Abstract: In a method and an apparatus for transmitting signals in an optical fiber, an amplitude modulator (1) is provided for amplitude modulating an optical carrier at high speed with signals to be transmitted. A suppressing means is provided to suppress at least part of one of the side bands of the modulated carrier to reduce the effect of group velocity dispersion in the optical fiber.

Proceedings ArticleDOI
08 Jun 1997
TL;DR: The 100BASE-T2 standard defines dual-duplex baseband transmission at a modulation rate of 25 MBaud, and adaptive digital filters are required for echo and NEXT cancellation, equalization, and interference suppression in the receivers.
Abstract: 100BASE-T2 is a new physical layer specification for IEEE 802.3 LANs operating at 100 Mbit/s ("fast Ethernet"). It enables users of the 10BASE-T Ethernet LAN technology to upgrade their networks from 10 Mbit/s to 100 Mbit/s performance while retaining an existing voice-grade cabling infrastructure. 100BASE-T2 transceivers will operate over two pairs in unshielded twisted-pair cables corresponding to EIA/TIA category 3 (UTP-3), which is the minimum requirement for 10BASE-T. In a four-pair UTP-3 cable, simultaneous operation of two 100BASE-T2 links, or one 100BASE-T2 and one 10BASE-T link, is permitted. Since voice-grade cables exhibit more signal attenuation and significantly higher crosstalk coupling between adjacent pairs than data-grade cables, sophisticated digital signal processing techniques are needed to achieve reliable 100 Mbit/s transmission. The 100BASE-T2 standard defines dual-duplex baseband transmission at a modulation rate of 25 MBaud. During each modulation interval, a four-bit data nibble or Ethernet specific control information is encoded into a pair of quinary signals. These signals are transmitted simultaneously on the two wire pairs in both signalling directions. In the receivers, adaptive digital filters are required for echo and NEXT cancellation, equalization, and interference suppression.

Proceedings ArticleDOI
22 Sep 1997
TL;DR: In this paper, experiments on the optical generation of low-phase noise millimeter-wave signals and 140 Mbit/s-data transmissions were reported, where the 62.5 GHz mmWave carrier is remotely generated by heterodyning the signals of semiconductor lasers at an optic/mmWave converter.
Abstract: Experiments on the optical generation of low-phase noise millimeter-wave signals and 140 Mbit/s-data transmissions are reported. The 62.5 GHz millimeter-wave carrier is remotely generated by heterodyning the signals of semiconductor lasers at an optic/millimeter-wave converter.

Patent
13 Aug 1997
TL;DR: In this article, the amplitude modulation of the optical carrier signals for different channels using different LF frequencies, before combining the optical for all channels using a wavelength-selective optical multiplexer (3), with conversion of optical signal into a corresponding electrical signal.
Abstract: The method uses amplitude modulation of the optical carrier signals for the different channels using different LF frequencies, before combining the optical for all channels using a wavelength-selective optical multiplexer (3), with conversion of the optical signal into a corresponding electrical signal. The LF signals for the different channels are isolated amplitudes of the LF signals for the individual channels are determined, for controlling the laser light sources of the channel transmitters.

Patent
08 Jan 1997
TL;DR: In this paper, the authors proposed a simple and small base station to make the device inexpensive and also to improve maintainability and reliability, where an LN modulator 11b performs light modulation of output light of a laser light source 11a to generate an optical carrier, and after a non- deflector 11d nonpolarizes it, it is transmitted to a base station 60A through an optical fiber 20a.
Abstract: PROBLEM TO BE SOLVED: To make the structure of a base station device simple and small to make the device inexpensive and also to improve maintainability and reliability. SOLUTION: A center device 10A is provided with an optical carrier sending part 11, where, an LN modulator 11b performs light modulation of output light of a laser light source 11a to generate an optical carrier, and after a non- deflector 11d nonpolarizes it, it is transmitted to a base station 60A through an optical fiber 20a. On the other hand, at the station 60A, an LN modulator 61a performs light modulation of an optical carrier signal that is transmitted from the station 10A by an up radio communication signal that is transmitted from a mobile station by radio to generate an up optical communication signal, and the up optical communication signal is transmitted to the device 10A through the fiber 20a. COPYRIGHT: (C)1998,JPO

Patent
19 Sep 1997
TL;DR: In this paper, an automatic level control (ALC) processing is performed to suppress the light intensity fluctuation of wavelength light and an optical carrier is generated, which is then inputted to an optical modulator and modulated with data inputted through an amplifier.
Abstract: PROBLEM TO BE SOLVED: To suppress intense noise, to transmit a signal with narrow ASE (amplified natural discharge light) at a higher bit rate and to effectively use an optical band. SOLUTION: The natural discharge light of a wide band is emitted from a light source 21 and an optical filter 22 cuts specified wavelength light and inputs it in an optical modulator 23. A part of wavelength obtained in the optical filter 22 is extracted by an optical coupler 24 and a photodiode 25 measures the light intensity amplitude. The measured result is polarity-inverted in an inversion amplifier 27 and it is set to be the modulation input of an optical modulator 23. Thus, an ALC processing (automatic level control) is executed, the light intensity fluctuation of wavelength light is suppressed and an optical carrier is generated. The optical carrier is inputted to an optical modulator 26 and is modulated with data D inputted through an amplifier 28. Thus, an optical transmission signal is obtained. Thus, the intense noise of the optical carrier can be suppressed by ALC and the signal of the high bit rate can be transmitted with the considerably low bit error rate.

Journal ArticleDOI
TL;DR: In this paper, the ability of an 8-channel sequentially-pulsed 1555 nm integrated multifrequency laser distributed to 4.3 million WDM PON lines through five amplifier/splitter stages was described.
Abstract: The ability to provide a 55 Mbit/s service to 33.5 million PON subscribers is described, using an 8-channel sequentially-pulsed 1555 nm integrated multifrequency laser distributed to 4.3 million WDM PON lines through five amplifier/splitter stages. The wavelength-encoded pulses were modulated at 440 Mbit/s with an InGaAsP electroabsorption modulator, and then after 20 km transmission through singlemode fibre, they were demultiplexed with an arrayed-waveguide grating router. Error-free transmission was achieved.

Proceedings ArticleDOI
10 Nov 1997
TL;DR: In this article, a Brillouin selective sideband amplification (BSSA) was proposed to improve the performance and extend the functionality of an analog photonic system, which is much more efficient than any other optical amplification method.
Abstract: In this paper we introduce a powerful technique called Brillouin selective sideband amplification (BSSA) to drastically improve the performance and extend the functionality of an analog photonic system. This optical amplification process is much more efficient than any other optical amplification method because all Brillouin scattering energy from the pump laser goes directly into the desired weak sideband, not to the strong optical carrier. Consequently the saturation of the receiving photodetector can also be avoided. We obtained a net link gain of 20 dB of an externally modulated photonic link at 5 GHz with an optical power of only 2.6 mW in the photodetector. Such a large and efficient signal amplification will prove extremely important in systems with narrow instantaneous bandwidth but broad overall bandwidth (e.g. widely tunable systems).

Proceedings ArticleDOI
16 Feb 1997
TL;DR: In this paper, 3.3 V operating SDH/SONET 3R receiver modules for 156 M bit/s and 622 Mbit/s optical communication are reported.
Abstract: Optical communication has been growing rapidly and requires continual improvement in the performance of optical data link modules. In many cases, the supply voltage of optical data link modules is 5.0 V. In this paper, 3.3 V operating SDH/SONET 3R receiver modules for 156 Mbit/s and 622 Mbit/s optical communication are reported.

Proceedings ArticleDOI
21 Jul 1997
TL;DR: In this paper, multimode interference in a semiconductor optical amplifier is used to simultaneously split (× 10) and amplify a RF signal on an optical carrier, which is used in this paper.
Abstract: In this work, multimode interference in a semiconductor optical amplifier is used to simultaneously split (× 10) and amplify a RF signal on an optical carrier.

Journal ArticleDOI
TL;DR: In this article, the transversal tapped delay line (TSL) technique was used to construct an infinite impulse response structure for an optical carrier wave (OCW) in a fiber-optic network.
Abstract: Analogue microwave filters can be produced using optical components when the microwave signal is modulated onto an optical carrier wave, processed optically, and then recovered electrically. The fiber-optic network presented here displays a bandpass filter response to the modulating signal. The processing operation is based on the transversal tapped delay line technique forming an infinite impulse response structure. By employing an incoherent optical carrier wave for signal transmission, the structure's responses are modelled using linear discrete signal processing techniques.

Proceedings ArticleDOI
16 Feb 1997
TL;DR: It is demonstrated that an optical sampling technique maybe used to achieve rate conversion in network applications where the desired time-dilated data stream rates range from 100 MHz-10 GHz.
Abstract: 100 Gbit/s TDM multi-access networks will provide guaranteed bandwidth and bandwidth-on-demand packet service to high-end users. In these networks, most of the data processing will be performed electronically. Therefore, it is essential for a receiver node to buffer the incoming ultrahigh-speed (100 Gbit/s) optical data packets, rate convert the data to electronic rates (100 MHz-10 GHz), detect and process the data. Rate-converted data is a time-dilated version of the original data, and as such, differs from demultiplexed data. Time dilation of clock and data streams to low rates has been used as a pulse-characterization technique. Such schemes enabled characterization of narrow pulses without high-speed photodiodes or mechanical translation stages. We demonstrate that an optical sampling technique maybe used to achieve rate conversion in network applications where the desired time-dilated data stream rates range from 100 MHz-10 GHz. We demonstrate all-optical rate conversion of 10 Gbit/s data packets to 100 Mbit/s, 200 Mbit/s, 400 Mbit/s, 600 Mbit/s, and 800 Mbit/s data packets. The variation in the converted data rate is achieved using a tunable-repetition-rate sampling source. Extension of this technique to rate-converting 100 Gbit/s data streams is straightforward and will be discussed.

Patent
21 Jan 1997
TL;DR: In this paper, the authors proposed a light modulator and an optical fiber communication system capable of suppressing a relative strength noise and improving an SN ratio, where a light distributor equally distributes a light carrier A to 1st and 2nd light carriers A1, A2.
Abstract: PROBLEM TO BE SOLVED: To provide a light modulator and an optical fiber communication system capable of suppressing a relative strength noise and improving an SN ratio. SOLUTION: A light distributor 11 equally distributes a light carrier A to 1st and 2nd light carriers A1, A2. An 180 deg. distributer 12 distributes an RF subcarrier signal B to 1st and 2nd RF subcarrier signals B1, B2 of which phases are unutuaily inverted by 180 deg.. An electro-optical modulator 13 modulates the 1st optical carrier A1 by the 1st RF subcarrier signal B1 and outputs a 1st optical signal C1. An electro-optical modulator 14 modulates the 2nd optical siganal A2 by the 2nd RF subcarrier signal B2 and outputs a 2nd optical signal C2. Photodiodes 6, 7 respectively convert the 1st and 2nd optical signals C1, C2 transmitted through optical fibers 4, 5 into 1st and 2nd electric signals D1, D2. An 180 deg. synthesizer 8 inverts the phase of the signal D1 by 180 deg. and synthesizes the inverted signal and the 2nd electric signal D2.

Proceedings ArticleDOI
18 May 1997
TL;DR: In this paper, the AIII-V Mach-Zehnder (MZ) optical modulator was employed within a.10 Gb/s optical transmitter to achieve transmission in excess of 80 km over NDSF without use of external dispersion compensation components.
Abstract: AIII-V Mach-Zehnder (MZ) optical modulator has successfully been employed within a .10 Gb/s optical transmitter1,2 to achieve transmission in excess of 80 km over NDSF without use of external dispersion compensation components.

01 Sep 1997
TL;DR: In this article, the authors discuss the properties of PIN-waveguide photodetectors, GaAs microwave monolithic integrated circuits with dual gate FETs, InP edge-coupled Heterojunction Bipolar Phototransistors to fulfill the requirements of fiber optic radio communications.
Abstract: Fiber optic radio communications will require devices able to convert an optical carrier into a millimeter wave carrier. After a brief recall of possible systems to be used, showing that in most cases, the transducer must associate the following functions : high speed photodetection, millimeter wave amplification, and mixing, we will discuss the properties of PIN-waveguide photodetectors, GaAs microwave monolithic integrated circuits with dual gate FETs, InP edge-coupled Heterojunction Bipolar Phototransistors to fulfill these requirements.

01 Jan 1997
TL;DR: An InGaAs-InAlAs multiple-quantum-well (MQW) electroabsorption (EA) waveguide modulator fabricated on a GaAs substrate has been designed and characterized at 1.3 m wavelength for microwave signal transmission on an analog fiber- optic link.
Abstract: An InGaAs-InAlAs multiple-quantum-well (MQW) electroabsorption (EA) waveguide modulator fabricated on a GaAs substrate has been designed and characterized at 1.3- m wavelength for microwave signal transmission on an analog fiber- optic link. The modulator structure with a lattice constant 2.5% larger than that of GaAs is grown upon a 0.7- m-thick three- stage compositionally step-graded In Al As relaxed buffer. The waveguide modulator exhibits a high-electrooptic slope effi- ciency of 0.56 V , a 3-dB electrical bandwidth of 20 GHz, and a large optical saturation intensity in excess of 17 mW. These high- speed optoelectronic modulators could potentially be integrated with on-chip GaAs electronic driver circuits. HE 1.3- m spectral window is desirable for fiber-optic communications because the standard single-mode sil- ica optical fiber exhibits a low-loss chromatic dispersion minimum at wavelengths between 1301 and 1321 nm. Op- toelectronic devices operating at 1.3 m can take advantage of not only the second-generation fiber-optic telecommunica- tion networks deployed but also the commercially available high-power, low-RIN-noise solid-state lasers. The latter is important for analog fiber-optic links since the optical carrier power directly determines the RF link gain, noise figure, and spurious-free dynamic range. Optoelectronic devices on GaAs substrates offer the potential for monolithic integration with GaAs MMIC's. Implementation of 1.3- m vertical-cavity electroabsorption (EA) modulators on GaAs substrates has been demonstrated by growing the InGaAs multiple-quantum wells (MQW's) on top of a thick buffer (2.3 4.6 m) in which the composition is linearly-graded (1)-(3). Recently, we have reported that a novel step-graded InAlAs strain-relief buffer as thin as only 0.3 m can also effectively confine the misfit dislocations for subsequent growth of high-quality 1.3- m MQW's (4). The simple structure has been modi- fied to incorporate quaternary InGaAlAs waveguide layers to implement a high-speed GaAs-based electroabsorption wave- guide modulator. This letter describes the performance of the waveguide modulator for analog fiber-optic link applications. The schematic of the p-i(MQW)-n ridge waveguide modu- lator structure on an n GaAs substrate is illustrated in Fig. 1.

Journal ArticleDOI
TL;DR: The fabrication and performance characteristics of a receiver electronics array for optical data links and parallel optical interconnects are described and the 18-channel array operates at 622 Mbit/s with 10-15 error rate.
Abstract: The fabrication and performance characteristics of a receiver electronics array for optical data links and parallel optical interconnects are described. The 18-channel array operates at 622 Mbit/s with a 10-15 error rate.

Proceedings ArticleDOI
22 Sep 1997
TL;DR: Optical switching of Tbit/sec ATM streams through dynamic WDM is proposed, overcome technological obstacles, and central control is avoided via optical carrier detection.
Abstract: Optical switching of Tbit/sec ATM streams through dynamic WDM is proposed. Optical manipulations are concentrated in a small area, overcoming technological obstacles. Central control is avoided via optical carrier detection. Multimedia and parallel computing applications are supported.

Patent
28 Apr 1997
TL;DR: In this paper, the authors proposed a method which performs fully decompressing optical pulses to perform reception in the optical network communication system, where the flow rates of the electric field can be adapted to those of the optical field due to the time division multiplex, with compression of the pulses forming the optical data transmises.
Abstract: In the optical network communication systems, flow rates of the electric field can be adapted to those of the optical field due to the time division multiplex, with compression of the pulses forming the optical data transmises.L'invention relates to a method which performs so fully decompressing optical pulses to perform reception. The method comprises: - forming q auxiliary signals (Se-Sh) obtained by modulating the received signal (S'1) q optical carrier waves having different wavelengths (lambdae-lambdah), and- combining q auxiliary signals delayed (Re-Rh) obtained by applying the auxiliary signals (Se-Sh) delays such as delayed two auxiliary signals (Re-Rh) are shifted temporally consecutive any duration to pulses forming the received signal (S'1) .