Showing papers by "Hung-Chang Chien published in 2011"
TL;DR: In this article, a new optical millimeter-wave generation scheme to triple the beating frequency based on subcarrier multiplexing in combination with single sideband technique is proposed, capable of high tolerance of fiber chromatic dispersion.
Abstract: A new optical millimeter-wave generation scheme to triple the beating frequency based on subcarrier multiplexing in combination with single sideband technique is proposed, capable of high tolerance of fiber chromatic dispersion. The proposed scheme can be applied to two types of multiband 60-GHz wireless over fiber access systems: one with widely separated bands including millimeter-wave, microwave and baseband and the other one with multiple 60-GHz sub-bands. Experimental verification of the proposed system with widely separated bands is presented with the generation and error-free transmission of 2.1-Gb/s data on the 63-GHz mm-wave and 21-GHz microwave carriers over 50-km single-mode fiber (SMF-28) without dispersion compensation. The power penalties caused by 50-km fiber transmission for both signals are both less than 1.0 dB at BER of 10-9 Meanwhile, simultaneous generation and transmission of multiple services at 60-GHz sub-bands are also introduced. The experimental results demonstrate the successful delivery of the 1-Gbps data carried by 60-GHz millimeter-wave both over 50-km SMF-28 and wireless distance of 6-m without any dispersion compensation. The optical receiver sensitivity of the transmission with two sub-bands degrades by 2 dB compared with the single band 60-GHz signal, and the power penalty from 50-km SMF-28 transmission is 0.8 dB at BER of 10-9. From the theoretical analysis and experimental demonstrations of the two multiband systems, it is concluded that the proposed millimeter-wave generation scheme indeed increase the transmission distance for the system with 60-GHz signal, which normally having SMF transmission distance of few tens of kilometers, by utilizing optical and electrical components with low-bandwidth requirements.
47 citations
Patent•
25 Feb 2011TL;DR: In this article, the authors describe systems and methods of providing optical information transmission systems, including a precoder configured to differentially encode a binary data signal, a duobinary encoder, an electrical-to-optical conversion unit, and an optical upconversion unit.
Abstract: The present invention describes systems and methods of providing optical information transmission systems. An exemplary embodiment of the present invention includes a precoder configured to differentially encode a binary data signal, a duobinary encoder configured to encode the differentially encoded binary data signal as a three-level duobinary signal, an electrical-to-optical conversion unit configured to convert the three-level duobinary signal into a two-level optical signal, and an optical upconversion unit configured to modulate the two-level optical signal onto a higher frequency optical carrier signal and transmit the modulated higher frequency optical carrier signal onto an optical transmission medium.
46 citations
TL;DR: An "ultra-dense" concept into next-generation WDM-PON systems is introduced, which transmits a Nyquist-WDM uplink with centralized uplink optical carriers and digital coherent detection for the future access network requiring both high capacity and high spectral efficiency.
Abstract: We introduce an "ultra-dense" concept into next-generation WDM-PON systems, which transmits a Nyquist-WDM uplink with centralized uplink optical carriers and digital coherent detection for the future access network requiring both high capacity and high spectral efficiency. 80-km standard single mode fiber (SSMF) transmission of Nyquist-WDM signal with 13 coherent 25-GHz spaced wavelength shaped optical carriers individually carrying 100-Gbit/s polarization-multiplexing quadrature phase-shift keying (PM-QPSK) upstream data has been experimentally demonstrated with negligible transmission penalty. The 13 frequency-locked wavelengths with a uniform optical power level of -10 dBm and OSNR of more than 50 dB are generated from a single lightwave via a multi-carrier generator consists of an optical phase modulator (PM), a Mach-Zehnder modulator (MZM), and a WSS. Following spacing the carriers at the baud rate, sub-carriers are individually spectral shaped to form Nyquist-WDM. The Nyquist-WDM channels have less than 1-dB crosstalk penalty of optical signal-to-noise ratio (OSNR) at 2 × 10(-3) bit-error rate (BER). Performance of a traditional coherent optical OFDM scheme and its restrictions on symbol synchronization and power difference are also experimentally compared and studied.
38 citations
TL;DR: In this article, a low-cost 40 GHz optical millimeter-wave (mm-wave) generation scheme constructed by the utilization of a frequency-tripling directly modulated Fabry-Perot (FP) laser is presented.
Abstract: We propose and demonstrate a low-cost 40-GHz optical millimeter-wave (mm-wave) generation scheme constructed by the utilization of a frequency-tripling directly modulated Fabry-Perot (FP) laser. The scheme requires neither a strong optical injection power nor an additional optical filter to select the desired optical sidebands. Error-free transmission of the generated 40.2-GHz optical mm-wave carrying 2.5-Gb/s signal over a 20-km standard single-mode fiber (SSMF) has been experimentally demonstrated. In addition, a performance comparison with the conventional case of an injection-locked FP laser directly driven with a 40.2-GHz RF signal is also simulated, which shows that the presented scheme with highly reduced bandwidth requirement is suitable for mm-wave radio-over-fiber (RoF) systems.
25 citations
06 Mar 2011
TL;DR: A survivable protection and restoration mechanism is proposed using wavelength switching of low-cost integrated tunable laser assembly to protect multiple fiber failures in a high capacity colorless WDM-PON.
Abstract: A survivable protection and restoration mechanism is proposed using wavelength switching of low-cost integrated tunable laser assembly to protect multiple fiber failures in a high capacity colorless WDM-PON. This scheme does not require any expensive and complex opto-electronic space switching device for high throughput WDM-PON system.
20 citations
TL;DR: In this article, the modulation index of an optical phase modulator without requiring any complicated bias control circuits or narrowband optical filters was used to achieve error-free transmission of 40GHz optical mm-wave with 2.5-Gb/s data over 10-km single mode fiber (SMF-28) and 3m air distance.
Abstract: We have proposed and experimentally demonstrated a new radio-over-fiber system technique generating optical millimeter-waves with central carriers suppressed by simply tuning the modulation index of an optical phase modulator without requiring any complicated bias control circuits or narrowband optical filters. Error-free transmission of the generated 40-GHz optical mm-wave with 2.5-Gb/s data over 10-km single mode fiber (SMF-28) and 3-m air distance was achieved. The experimental results were analyzed and compared with the traditional method that requires a specific carrier suppression optical filter. The power penalty caused by the crosstalk between wavelength division multiplexed (WDM) channels was experimentally measured and studied and was about 4 dB at a bit error rate (BER) of 10-9. The filter bandwidth requirement, achievable carrier suppression ratio, and harmonics fluctuation due to fiber dispersion were also theoretically analyzed.
19 citations
06 Mar 2011
TL;DR: In this article, a bi-directional in-building radio-over-fiber access network is proposed to deliver multi-gigabit, high-definition video and data services using all-optical conversion at the head-end and single-chip, 60GHz CMOS radio transceiver at the end-terminals.
Abstract: We demonstrate, for the first time, a bi-directional in-building radio-over-fiber access network to deliver multi-gigabit, high-definition video and data services using all-optical conversion at the head-end and single-chip, 60GHz CMOS radio transceiver at the end-terminals.
15 citations
06 Mar 2011
TL;DR: An integrated optical wireless access architecture based on radio-over-fiber technology is proposed in order to provide super broadband, ultra low-latency connectivity among various telemedicine modalities to facilitate real- time and near real-time communication for remote health care services.
Abstract: Development of system technology for effective networking infrastructure for next generation e-health applications is addressed. An integrated optical wireless access architecture based on radio-over-fiber technology is proposed in order to provide super broadband, ultra low-latency connectivity among various telemedicine modalities to facilitate real-time and near real-time communication for remote health care services.
14 citations
06 Mar 2011
TL;DR: In this paper, multi-band vector signal delivery over DSB-SC RoF system generated via single-stage optical upconversion has been accomplished through LO power enhancement, and was successfully demonstrated over 100-km fiber and 5-meter wireless.
Abstract: For the first time, multi-band vector signal delivery over DSB-SC RoF system generated via single-stage optical upconversion has been accomplished through LO power enhancement, and was successfully demonstrated over 100-km fiber and 5-meter wireless.
9 citations
18 Sep 2011
TL;DR: In this paper, a dual-pump polarization insensitive wavelength conversion based on four-wave mixing of 1.2 Tb/s optical OFDM superchannel in high-nonlinear optical fiber is proposed and experimentally demonstrated for the first time.
Abstract: Orthogonal dual-pump polarization insensitive wavelength conversion based on four-wave mixing of 1.2 Tb/s optical OFDM superchannel in high-nonlinear optical fiber is proposed and experimentally demonstrated for the first time. The converted signal is coherent detected, and OSNR penalty is around 2 dB after wavelength conversion.
7 citations
Proceedings Article•
04 Jul 2011TL;DR: This work has transported real-time, uncompressed telepathology images over 25-km fiber and proposed a converged optical wireless access architecture using radio-over-fiber technology to deliver medical data and images independent of data bit rates, formats, and protocols.
Abstract: We propose a converged optical wireless access architecture using radio-over-fiber technology to deliver medical data and images independent of data bit rates, formats, and protocols. We have transported real-time, uncompressed telepathology images over 25-km fiber.
06 Mar 2011
TL;DR: In this paper, OFDMA and SC-FDMA were compared experimentally as candidate uplink access techniques for next-generation PONs and important issues like peak-to-average power ratio, optical beat interference, and symbol delay were studied and experimentally measured.
Abstract: For the first time, OFDMA and SC-FDMA are compared experimentally as candidate uplink access techniques for next-generation PONs. Important issues like peak-to-average power ratio, optical beat interference, and symbol delay are studied and experimentally measured.
TL;DR: In this paper, a vector signal transmission scheme through double-sideband carrier-suppressed (DSB-CS) radio-over-flber system is proposed and experimentally demonstrated.
Abstract: A novel vector signal transmission scheme through double-sideband carrier-suppressed (DSB-CS) radio-over-flber system is proposed and experimentally demonstrated. Traditionally, the single-stage DSB-CS optical millimeter (mm)-wave generation scheme could not deliver a vector signal due to the loss of phase information at the receiver. However, we found that by simply adding dc offset to the transmitting vector signal, the desired signal after beating at the receiver can be preserved and enhanced without introducing any hardware complexity to existing systems. A feasibility demonstration of transmitting a 200-Mb/s quadrature phase-shift-keying orthogonal frequency-division-multiplexing (QPSK-OFDM) signal on 60-GHz optical mm-wave over 10-km standard single-mode fiber (SSMF) has been successfully completed with a demodulated error vector magnitude (EVM) less than 5.52% in our experiment. In addition, the value of the required dc offset and its impact to the system performance is also experimentally investigated.
Proceedings Article•
ZTE1
TL;DR: In this article, the authors demonstrated a 24Tb/s (24×1.3Tb) C and L-band WDM transmission of PDM-CO-OFDM superchannels over 2400km EDFA-only SMF-28 link with BER less than the 3rd generation FEC threshold of 2×10−2.
Abstract: We firstly demonstrated a 24Tb/s (24×1.3Tb/s) C and L-band WDM transmission of PDM-CO-OFDM superchannels over 2400km EDFA-only SMF-28 link with BER less than the 3rd generation FEC threshold of 2×10−2. Each PDM-CO-OFDM superchannel per WDM tributary delivers up to 1.3Tb/s total capacity over 13 flattened, frequency-locked optical subcarriers yielding a compact spectral width of 350GHz.
18 Jul 2011
TL;DR: In this article, a spectrally efficient, high-capacity, polarization-interleaved (PI OWDM PON) PON architecture is proposed and the transmission performance of a 3-channel 25GHz-PI-OWDM system is theoretically analyzed and experimentally demonstrated over 15-km SMF-28 access network architecture.
Abstract: We proposed a spectrally-efficient, high-capacity, polarization-interleaved (PI) OWDM PON architecture. The transmission performance of a 3-channel 25GHz-PI-OWDM system is theoretically analyzed and experimentally demonstrated over 15-km SMF-28 access-network architecture.
01 May 2011
TL;DR: Simulated results show that proposed scheme with narrow bandwidth can achieve higher tolerance to narrowband filtering without changing DQPSK demodulation structure.
Abstract: We demonstrate a new modulation format based on PolMux DQPSK with duobinary shape. Simulated results show that proposed scheme with narrow bandwidth can achieve higher tolerance to narrowband filtering without changing DQPSK demodulation structure.
06 Mar 2011
TL;DR: A novel orthogonal wavelength-division-multiplexed passive optical network with 25-GHz channel spacing with error-free transmission over 15-km SMF-28 was proposed and experimentally demonstrated for the first time.
Abstract: A novel orthogonal wavelength-division-multiplexed passive optical network with 25-GHz channel spacing has been proposed and experimentally demonstrated for the first time. Error-free transmission over 15-km SMF-28 was achieved for both 25-Gb/s downlink and 12.5-Gb/s uplink.
06 Mar 2011
TL;DR: A novel optical clock distribution scheme for MIMO-enhanced wireless interconnects and low-power, error-free, multi-gigabit wireless transmission has been demonstrated by employing centrally distributed optical clock.
Abstract: We propose a novel optical clock distribution scheme for MIMO-enhanced wireless interconnects. Low-power, error-free, multi-gigabit wireless transmission has been demonstrated by employing centrally distributed optical clock.
01 May 2011
TL;DR: In this paper, a new frequency-tripling and quadrupling scheme based on directly modulated optically injection-locked Fabry-Perot laser was proposed to achieve error-free transmission of millimeter-wave signal over 20-km SSMF.
Abstract: Optical mm-waves are generated via a new frequency-tripling and quadrupling scheme, respectively, which is based on directly modulated optically injection locked Fabry-Perot laser. Error-free transmission of millimeter-wave signal over 20-km SSMF has been demonstrated.