Abstract
A tunable optical rail is embedded into the cavity of a nonlinear-polarization-rotation
(NPR) mode-locked fiber laser to generate a sampling pulse with different repetition frequencies and
realize bit-rate-adaptive software synchronous optical sampling. Two ultrashort pulses (20.26677 and
20.22900 MHz) are derived, and a 100-MHz data signal is sampled twice with these pulses based on
sum-frequency generation (SFG) in periodically poled lithium niobate (PPLN). The eye diagram is
successfully recovered, and an estimated bit rate of 102.22 MHz is derived. This method is feasible
for bit rates ranging from 200 MHz to 1 GHz, with <3% relative error.
© 2013 Chinese Optics Letters
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