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all-optical clock extraction for CSRZ modulation data

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Frontiers of Optoelectronics 2009年第1期2卷 21-27页

作者： Zhixin CHEN Xin JIN Huaihu CAO Jian WANG School of Information Central University of Finance and Economics

This paper demonstrates a theoretical investigation on clock extraction from carrier-suppressed returnto-zero(CSRZ) modulation format data at 40 Gbit/s by using a semiconductor optical amplifier(SOA)-based ring laser. A completely numerical analysis about the clock characteristics at 40 Gbit/s is done, which is an effective guide for the experiment and necessary to optimize system performance. The crucial parameters, including the pulse width, energy of the CSRZ data signals and influence of SOA bias current, are analyzed because they determine the quality of the recovered clock pulses. Meanwhile, simulation results show that high-quality clock extraction from 2～7–1 pseudo-random binary sequence(PRBS) CSRZ data at 40 Gbit/s can be achieved by using higher power assisting continuous-wave(CW) light into a SOA-based ring laser.

关键词： all-optical signal processing all-optical clock extraction semiconductor optical amplifier (SOA) cross gain modulation (XGM) carrier-suppressed return-to-zero (CSRZ) modulation

Simulation of 40 Gbit/s NRZ to RZ format conversion based on sum-frequency generation using a PPLN loop mirror

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Frontiers of Optoelectronics 2009年第1期2卷 9-14页

作者： Jian WANG Junqiang SUN Weiwei ZHANG Zhefeng HU Wuhan National Laboratory for Optoelectronics College of Optoelectronic Science and Engineering Huazhong University of Science and Technology

A novel scheme of all-optical format conversion is proposed and simulated from non-return-to-zero(NRZ) to return-to-zero(RZ) at 40 Gbit/s by exploiting sum-frequency generation(SFG) in a periodically poled lithium niobate loop mirror(PPLN-LM). The conversion performance is analyzed, including eye diagrams, conversion efficiency, pulse width ratio, duty cycle, Q-factor,extinction ratio, and tunability. It is found that the signal wavelength can be tuned in a wide wavelength range by properly changing the pump wavelength.

关键词： nonlinear optics optical communications all-optical signal processing all-optical format conversion non-return-to-zero (NRZ) return-to-zero (RZ) sum-frequency generation (SFG) periodically poled lithium niobate (PPLN) loop mirror

Real-time and ultrafast optical pulse quantization based on slicing the supercontinuum

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Chinese Optics Letters 2021年第8期19卷 69-74页

作者： Ya Guo Qiang Cai Zhiwei Jia Bingjie Xu Zhensen Gao Qianwu Zhang Ruonan Zhang Adonis Bogris K.Alan Shore Yuncai Wang Pu Li Key Laboratory of Advanced Transducers and Intelligent Control System Ministry of EducationTaiyuan University of TechnologyTaiyuan 030024China School of Information Engineering Guangdong University of TechnologyGuangzhou 510006China Key Laboratory of Specialty Fiber Optics and optical Access Networks Shanghai UniversityShanghai 200444China School of Electronics and Information Northwestern Polytechnical UniversityXi’an 710072China Science and Technology on Communication Security Laboratory Institute of Southwestern CommunicationChengdu 610041China Department of Informatics and Computer Engineering University of West AtticaAthens 12243Greece School of Electronic Engineering Bangor UniversityWales LL571UTUnited Kingdom

all-optical analog-to-digital conversion is a paramount issue in modern science. How to implement real-time and ultrafast quantization to optical pulses with different intensities in an all-optical domain is a central problem. Here, we report a realtime demonstration of an all-optical quantization scheme based on slicing the supercontinuum in a nonlinear fiber. In comparison with previous schemes through off-line analysis of the power of different optical spectral components in the supercontinuum, this, to the best of our knowledge, is the first demonstration of such functionality online in the time ***, the extinction ratio among the quantized outputs can exceed 10 d B, which further confirms the feasibility of the proposed quantization scheme. The current 3 bit resolution in the proof-of-principle experiment is limited by the current experimental condition, but it can be expected to be greatly enhanced through improving both the spectral width of the generated supercontinuum and the number of filtering channels used.

关键词： all-optical analog-to-digital conversion photonic quantization all-optical signal processing supercontinuum generation

Principle and applications of semiconductor optical amplifiers-based turbo-switches

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Frontiers of Optoelectronics 2016年第3期9卷 346-352页

作者： Xuelin YANG Weisheng HU State Key Laboratory of Advanced optical Communication Systems and Networks Shanghai Jiao Tong University Shanghai 200240 China

all-optical effectively increase the semiconductor optical recovery time or the high-speed turbo-switches can switching speed using cascaded amplifiers （SOAs）. The overall bandwidth of turbo-switch was numerically analyzed with time-domain and frequency-domain SOA models. The turbo-switch was explored from the fundamental carrier dynamics in SOAs for the purpose of further increasing its operation speed. An integrated turbo-switch was also been proposed and demonstrated, where a phase adjustable Mach-Zehnder interferometer （MZI） was applied as an optical band-pass filter between SOAs. Wavelength conversion was first demonstrated at 84.8 Gbit/s using the integrated turbo-switch.

关键词： semiconductor optical amplifier (SOA) all-optical signal processing high-speed switches semicon-ductor integration

Review of photonic Hilbert transformers

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Frontiers of Optoelectronics 2013年第1期6卷 78-88页

作者： Chaotan SIMA Optoelectronics Research Centre University of Southampton Southampton SOl 7 1B J UK

This paper reviews the demonstrations of photonic Hilbert transformers (PHTs), describing their progress and recent developments. The physical operating principles of PHTs including fractional Hilbert transformers are discussed, together with device applications in all-optical signal processing. Versatile approaches to realize PHTs are discussed, e.g., discrete free space optics, fiber-based schemes and integrated planar geometry. The numerical designs and experimental performances of these PHTs are analyzed in terms of spectral quality, operating bandwidth, system integration, and mechanical and thermal stability. Recent developments of the monolithically integrated photonic Hilbert transform (HT) devices include directional couplers and planar Bragg gratings which allow all-optical single-sideband (SSB) suppression and sideband switching.

关键词： photonic Hilbert transformer (PHT) Bragg reflectors direct UV writing all-optical signal processing

Review on SOA-MZl-based photonic add/drop and switching operations

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Frontiers of Optoelectronics 2013年第1期6卷 67-77页

作者： Claudio PORZI Giovanni SERAFINO Sergio PINNA An NGUYEN Giampiero CONTESTABILE Antonclla BOGONI The TeCIP Institute of Scuola Superiore Sant'Anna di Pisa via G. Moruzzi 1 56124 Pisa Italy Centre d'optique photonique et laser 2375 rue de la Terrasse local 2104 Universit6 Laval Qu6bec G1V-0A6 Canada 3 CNIT via G. Moruzzi 1 56124 Pisa Italy CNIT via G. Moruzzi 1 56124 Pisa Italy

Semiconductor optical amplifier-Mach-Zehnder interferometer (SOA-MZI) is a technologically mature optical device that can be exploited for a wide range of operations on both amplitude and phase modulated signals, with performance limited by the carrier lifetime in the SOAs. Recent advances on SOA structures have demonstrated their suitability for high quality, ultra-fast photonic signal processing, making SOA-MZI a good candidate for elaborating signals in new generation high-capacity optical networks. Dynamic wavelength switching/routing and add/drop operations are expected to bring benefits in future optical networks in terms of improved system flexibility and efficiency. The capability of performing such operations directly in the optical domain can significantly reduce the number of opto/electrical and electro/optical conversions in the routing nodes, reducing their power consumption and their latency time. Moreover, since phase-shift keying (PSK) formats or other advanced modulation formats involving both amplitude and phase modulation, start to coexist in optical communication systems with the conventional on-off keying (OOK) modulation format, the availability of a single device, suitable for processing all these different signals, is mandatory. The SOA-MZI fits all these requirements for both OOK and constant-envelope phase-modulated signals, providing a compact and flexible solution. Here we review on the use of the SOA-MZI for carrying out alloptical switching operations, by realizing wavelength conversion and add/drop functionalities, both for OOK and differential binary phase shift keying (DPSK) signals up to 40 Gb/s. Power penalties lower than 2 dB are demonstrated in all cases.

关键词： all-optical signal processing wavelength conversion semiconductor optical amplifier-Mach-Zehnder interferometer (SOA-MZI)

Novel Scheme of all-optical AND Gate Based on Fabry-Perot Semiconductor optical Amplifier

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Semiconductor Photonics and Technology 2007年第1期13卷 63-68页

作者： ZHANG Wei QIU Kun LING Yun PANG Ying Key Laboratory of Broadband Fiber Transmission and Communication Networks University of Electronic Science and Technology of China Chengdu 610054 CHN

A novel scheme of all-optical AND gate based on a Fabry-Perot semiconductor optical amplifier(FP-SOA) is proposed and its feasibility is verified by simulation. Using this scheme, all-optical AND gate can be realized with the extinction ratio of 10 dB. The influence of pulse interval and pulse width on the extinction ratio is also investigated.

关键词： all-optical packet switching all-optical signal processing all-optical AND gate FP-SOA