We propose a self-clocking method based on in-band clock pilot insertion at the transmission data signal. The method can achieve clock recovery without the need for an ultrafast phase comparator and a phase-locked loop in the receiver. We demonstrate fast synchronization, low timing jitter, and a highly stable recovered clock from a 160 Gbit/s optical time-division multiplexing data signal after a 51 km fiber transmission. The recovered clock shows no patterning effect with a clock dynamic range of 10 dB for error-free operation of 160 to 40 Gbit/s demultiplexing with a power penalty of 1.1 dB.
"As an effort to increase the capacity and transmission speed, one of the solutions is to combine wavelength division multiplexing (WDM) system with optical time division multiplexing (OTDM) system. High-repetition rates optical clock pulses are useful for ultrahigh-speed OTDM systems and all-optical signal processing  . "
[Show abstract][Hide abstract] ABSTRACT: In new optical pulse generator using delayed-interference-signal-wavelength-converter (DISC)-type all-optical gate, we injected sinusoidally modulated light to ring cavity. With this way, externally modulated laser oscillation and mode-locked pulse laser oscillation occurred. These generated pulse's widths and repetition frequencies are 27 ps, 10.5 GHz and 2.1 ps, 10.5 GHz, respectively.
[Show abstract][Hide abstract] ABSTRACT: We report experimental results on timing-jitter suppressed optical short pulse generation from a gain-switched single-mode vertical-cavity surface-emitting laser (VCSEL) at 1.55 μm wavelength with an external laser beam injection. The low timing-jittered optical short pulses are very useful for high-speed optical time-division-multiplexed (TDM) communications and signal processing. The obtained timing jitter and pulse duration from the VCSEL were less than 1 ps and 65 ps, respectively, at a pulse repetition rate of 1.6 GHz.
[Show abstract][Hide abstract] ABSTRACT: We demonstrate for the first time, to our knowledge, a clock-distribution method for ultra-high-speed optical time-domain multiplexed systems data packets that provides instantaneous synchronization, fast locking/unlocking times, and a highly stable bursty clock, enabling error-free operation of 160 to 10 Gbit/s time demultiplexing with a power penalty of 1.5 dB after 51 km transmission in standard single-mode fiber (ITU G.652).
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