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100-Gb/s undersea transmission with high spectral efficiency using pre-filtered QPSK modulation format

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Chinese Optics Letters 2010年第9期8卷 831-836页

作者： J.-X. Cai Y. Cai C. R. Davidson D. G. Foursa A. Lucero O. Sinkin W. Patterson A. Pilipetskii G. Mohs Neal S. Bergano Tyco Electronics Subsea Communications LLC ("TE SubCom" formerly known as ~co Telecommunications (US) Inc.) 250 Industrial Way West Eatontown NJ 07724 USA

We provide a review of our recent 100-Gb/s, high spectral efficiency （SE） experiment targeting transoceanic and regional undersea transmission distances. We demonstrated that simple pre-filtering at the transmitter together with a maximum a posteriori probability （MAP） detection algorithm can significantly improve SE. We transmitted 96×100-Gb/s pre-filtered polarization division multiplexed return-to-zero quadrature phase shift keyed （PDM-RZ-QPSK） channels with 300% SE over 10608 km using 52-km spans of 150-μm 2 fiber and simple single-stage erbium-doped fiber amplifiers （EDFAs）. We also achieved 400% SE over 4368 km using similar techniques.

关键词： Bit error rate Erbium doped fiber amplifiers Modulation optical signals Quadrature phase shift keying Signal processing

Digital signal processing for coherent multi-level modulation formats

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Chinese Optics Letters 2010年第9期8卷 863-870页

作者： Xiang Zhou AT&T Labs-Research 200 Laurel Ave South Middletown NJ 07748 USA

This paper presents a review on the recent progress of digital signal processing （DSP） in the high-speed optical transmission system using single-carrier based multi-level modulation formats. The principle of several digital phase and polarization tracking algorithms recently proposed and demonstrated for future spectrally-efficient optical transmission system are discussed in detail. A novel DSP-based interference mitigation algorithm for the single-ended coherent receiver has been included. Recent technology advance on transmitter-side DSP such as digital pulse-shaping, pre-equalization and digital nonlinear compensation has also been discussed.

关键词： Coherent receivers Dense wavelength division multiplexing optical signals Phase recovery Polarization division multiplexing Signal processing

100 nm broadband and ultra-compact multi-dimensional multiplexed photonic integrated circuit for high-capacity optical interconnects

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Photonics Research 2024年第12期12卷 2891-2900页

作者： RUOYU SHEN FANGCHEN HU BINGZHOU HONG XIN WANG AOLONG SUN JUNWEN ZHANG HAIBING ZHAO NAN CHI WEI CHU HAIWEN CAI WEIPING HUANG School of Information Science and Technology Fudan University Zhangjiang Laboratory Shanghai Institute of Optics and Fine Mechanics Chinese Academy of Sciences

Chip-scale multi-dimensional multiplexing technology that combines wavelengths and spatial modes on a silicon photonic integrated circuit(PIC) is highly promising for the link-capacity scaling of future optical ***, current multi-dimensional multiplexed PICs face significant challenges in simultaneously achieving broad optical bandwidth, low mode crosstalk, and dual-polarization modes in an ultra-compact footprint as the number of spatial modes increases.

关键词： Beam splitters Mode conversion optical interconnects optical signals Silicon photonics Waveguide modes

Weak laser pulse signal amplification based on a fiber Brillouin amplifier

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Chinese Optics Letters 2018年第11期16卷 66-69页

作者： Liwen Sheng Dexin Ba Zhiwei Lü National Key Laboratory of Science and Technology on Tunable Laser Harbin Institute of TechnologyHarbin 150001China Corresponding author： dexinba@*** corresponding author： lvzw@***

We propose a high-gain and frequency-selective amplifier for a weak optical signal based on stimulated Brillouin scattering in a single mode fiber. To be able to satisfy the needs of high gain and high signal-to-noise ratio laser pulse amplification, different fiber lengths and core diameters are used to fulfill this experiment. In the experiment, a 430 nW （peak power） pulsed signal is amplified by 70 dB with a signal-to-noise ratio of 14 dB. The small size, high gain, low cost, and low noise of the fiber Brillouin amplifier make it a promising weak signal amplification method for practical applications such as lidar.

关键词： Fiber optic amplifiers Lidar optical amplifiers optical signals Single mode fibers Stimulated Brillouin scattering

Investigation on microwave photonic filter group delay performance

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Chinese Optics Letters 2017年第8期15卷 22-25页

作者：陈碧娟 Erwin H.W.Chan 冯新焕王旭东关柏鸥 Guangdong Provincial Key Laboratory of optical Fiber Sensing and Communications Institute of Photonics Technology Jinan University School of Engineering and Information Technology Charles Darwin University

Processing microwave signals in the optical domain has a number of advantages including high reconfigurability, ultra-wide bandwidth, and immunity to electromagnetic interference （EMI）W. It also provides new capabil... 详细信息

关键词： Bandpass filters Brillouin scattering Fourier transforms Microwave photonic filters optical signals Spatial light modulators