Simultaneous clock recovery and demultiplexing of a 320 Gb/s OTDM system using an optoelectronic osc

• 作 者: 稽誉 贾锡学 李岩 伍剑 林金桐
• 机 构: State Key Laboratory of Information Photonics and Optical Communications,Beijing University of Posts
• 出 处: Chinese Optics Letters
• 发表日期: 2013年05期
• 关键词: oscillator OTDM cascaded clock modulator optoelectronic multiplexing jitter keyi

An improved optoelectronic oscillator scheme for an optical time division multiplexing(OTDM) system based on cascaded Mach-Zehnder modulator(MZM) and polarization modulator(PolM) is experimentally investigated.The system can simultaneously realize clock recovery and demultiplexing.With the MZM working at peak point to generate return-to-zero-33 optical pulses and the PolM working as an equivalent intensity modulator,a high-quality clock signal with 35-fs timing jitter is extracted from the 160-GBaud OTDM-differential quaternary phase-shift keying signal.Narrow short optical switch gates(4 ps) are also generated to demultiplex 160-GBaud signals to 40-GBaud signals.Error-free performance is achieved with 2.4-dB power penalty in the worst case.

An improved optoelectronic oscillator scheme for an optical time division multiplexing (OTDM) system based on cascaded Mach-Zehnder modulator (MZM) and polarization modulator (PolM) is experimentally investigated. The system can now realize clock recovery and demultiplexing .With the MZM working at peak point to generate return-to-zero-33 optical pulses and the PolM working as an equivalent intensity modulator, a high-quality clock signal with 35-fs timing jitter is extracted from the 160-GBaud OTDM-differential quaternary phase-shift keying signal.Narrow short optical switch gates (4 ps) are also generated to demultiplex 160-GBaud signals to 40-GBaud signals. Error-free performance is achieved with 2.4-dB power penalty in the worst case.