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Optical Frequency Comb Generation Using Dual-Mode Injection-Locking of Quantum-Dash Mode-Locked Lasers: Properties and Applications

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11 Author(s)
Sooudi, E. ; Department of Physics, University College Cork, Cork, Ireland ; Sygletos, Stylianos ; Ellis, Andrew D. ; Huyet, G.
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In this paper, we describe generation and application of wide narrow linewidth optical frequency combs using dual-mode injection-locking of InP quantum-dash mode-locked lasers. First, the dependence of the RF locking-range on the device's absorber voltage is experimentally investigated. Under optimized absorber voltage, a continuous wide RF locking-range of {\approx }{\rm 400}~{\rm MHz} is achievable for lasers with 21 GHz repetition rate. The total RF locking-range of {\approx }{\rm 440}~{\rm MHz} is possible considering locking-range for positive and negative absorber voltages. This wide tuning {>}2{%} of the repetition rate, a record for a monolithic mode-locked laser, is reported from a two-section device without any additional passive section or extended-cavity for repetition rate tuning. It is shown that the effective RF locking-range in dual-mode injection corresponds to the optical locking-range and repetition rate tuning under CW injection, which is wider when the free-running mode-locking operation is “less stable.” The widest comb consists of 35 narrow lines within 10 dB of the peak, spanning {\approx }{\rm 0.7}~{\rm THz} and generating 3.7 ps pulses. Second, we show the first demonstration of multi pump phase-synchronization of two 10 Gb/s DPSK channels in a phase-sensitive amplifier using dual-mode injection-locking technique. The phase-sensitive amplifier based on the “black box” scheme shows more than 7 dB phase-sensitive gain and error free performance for both input channels with 1 dB penalty.

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Quantum Electronics, IEEE Journal of  (Volume:48 ,  Issue: 10 )