Optical Carrier transmission rates

About: Optical Carrier transmission rates is a research topic. Over the lifetime, 2463 publications have been published within this topic receiving 33293 citations.

A multi-phase 10 GHz VCO in CMOS/SOI for 40 Gbits/s SONET OC-768 clock and data recovery circuits

Abstract: This paper presents the design of a multi-phase voltage-controlled oscillator (VCO) in CMOS/SOI technology, based on a ring amplifier with LC resonators. This circuit is a key block of a 40 Gbit/s serial communications system. Operating at a speed of one-fourth of the nominal data rate, this CMOS architecture complies with SONET OC-768 standard. The circuit exhibits a 25% frequency tuning range from 10.2 GHz to 13 GHz. The core power dissipation is 26 mW under a -1.2 V supply voltage. The single sideband phase noise measured is better than -104 dBc/Hz, at 1 MHz offset, over the frequency tuning range. The single-ended peak-to-peak amplitude of the four differential signals is 50 mV.

Fm modulator for semiconductor laser

Abstract: PURPOSE:To stabilize the optical carrier frequency, by inserting a Fabry-Pe rot etalon to a negative feedback circuit of an FM modulator using a semiconductor laser. CONSTITUTION:A bias DC is applied to a laser 4 from a terminal 5, a signal S1 and an output of a differential amplifier 6 of a negative feedback loop are inputted to a synthesis circuit 7, and the output is inputted to the laser 4 to perform FM modulation corresponding to the change in the signal S1. A part of the output of the laser 4 is collected at a lens 8 and a Fabry-Pe rot etalon FPE11 is inserted into an optical path 9. The intensity of light is changed according to the frequency fluctuation of the FM signal changed at the FPE11 and the transmitted light is detected at a photodetector 13 via a lens 12. The optical signal of an optical path 10 is detected at a photodetector 16 via a lens 15. The output of the detectors 13 and 16 is inputted to a differential amplifier 14 to input a signal S2 proportional to the difference of the optical paths and an input signal S'1 having the equal amplitude with the signal S2 to the amplifier 6, then the output of the amplifier 6 is zero. If the frequency of the laser 4 is changed due to temperature change, the amplifier 6 generates an output cancelling the frequency change to stabilize the laser frequency.

Millimeter-wave wireless LAN based on simultaneous upconversion technique of optical WDM channels

Abstract: The technique of simultaneous electro-optical upconversion is applied to seven operational DWDM channels for generating individual 60 GHz signals in each optical channel. In data transmission experiments including air link, two signal modulation schemes have been applied: OFDM at 50 MBit/s and BPSK at 156 MBit/s. An optical channel spacing of 100 GHz was used and low uncoded bit error rates were obtained in all experiments.

Impact of new transmission technologies on the network architecture, network management and economics

Abstract: Present telecommunication networks in various European countries are generally divided, depending on the size of the country, in three or four hierarchical levels in order to efficiently handle the traffic volume. This architecture is based upon available technology in the past, where many small local exchanges are used to compensate the relatively high cost of transmission systems. Due to the digitalization of the network in the last decade and new developments in transmission technology (e.g. optical fiber) the transmission costs decreased strongly. In addition there is an increasing demand for leased circuits (up to 2 Mbit/s) requiring sophisticated cross-connect systems. The paper discusses the influence of the emerging Synchronous Digital Hierarchy (SDM on the network structure and presents a first costs economic comparison with the current plesiochronous transmission network.

Phased antenna array including a plurality of electro-optical circuits having an optical source with an opto-electronic oscillator and associated methods

Abstract: A phased antenna array includes a plurality of electro-optic (EO) circuits. Each EO circuit has a digital-to-analog converter (DAC) configured to receive a baseband signal, and an optical source comprising an opto-electronic oscillator configured to generate an optical signal. Each EO circuit also has an EO modulator coupled downstream of the DAC and to the optical source and configured to modulate an optical carrier signal based upon the baseband signal and the optical signal, and an optical combiner coupled downstream of the EO modulator and coupled to the optical source. In addition, there are a plurality of antenna circuits spaced apart from the plurality of EO circuits, each antenna circuit comprising at least one photodiode and an antenna element coupled thereto. Moreover, a plurality of optical fibers couple the plurality of EO circuits to the plurality of antenna circuits.