KEYWORDS: Clocks, Optical clocks, Modulation, Semiconductor lasers, Interference (communication), Single sideband modulation, Single mode fibers, Laser optics, Binary data, Signal to noise ratio
We demonstrate 40 Gb/s all-optical clock recovery by using a monolithic integrated amplified-feedback laser (AFL) with
coherent injection-locked method. The AFL consists of a gain-coupled DFB laser and an optical amplified feedback
external cavity. With proper design and operation of AFL, the device can work at self-pulsation state that resulted from
the beating between two lasing modes. The self-pulsation can be injection-locked to the optical clock embedded in input
data streams. Due to different work mechanisms, there are two all-optical clock recovery operation modes: incoherent
injection-locked and coherent injection-locked. It's predicted that the coherent injection method has various advantages:
1) requiring low injection power recovery, 2) independent of the bit rate and 3) introducing little timing jitter to the
recovered clock. The robustness of coherent clock recovery is confirmed by our experimental results. We set up a return-to-
zero (RZ) pseudorandom binary sequence (PRBS) data streams all-optical clock recovery system. This coherent
injection-locked based clock recovery method is optical signal noise ratio (OSNR) and chromatic dispersion (CD)
degeneration tolerant, and has low timing jitter and high sensitivity.
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