The dynamics of coherent clock recovery (CR) using self-pulsing two-section distributed feedback (TS-DFB) lasers have been investigated. Both simulation and experimental results indicate fast lockup and walk-off of the clock-recovery process on the order of nanoseconds. Phase stability of the recovered clock from a pseudorandom bit sequence (PRBS) signal can be achieved by limiting the detuning between the frequency of free-running self-pulsation and the input bit rate. The simulation results show that all-optical clock recovery using TS-DFB lasers can maintain a better than 5% clock phase stability for large variations in power, bit rate, and optical carrier frequency of the input data and therefore is suitable for applications in optical packet switching.
© 2005 IEEE
Inwoong Kim, Cheolhwan Kim, Patrick L. LiKamWa, and Guifang Li, "Dynamics of All-Optical Clock Recovery Using Two-Section Index- and Gain-Coupled DFB Lasers," J. Lightwave Technol. 23, 1704- (2005)