Dynamics of all-optical clock recovery using two-section index- and gain-coupled DFB lasers

• Published in: Journal of lightwave technology Vol. 23; no. 4; pp. 1704 - 1712
• Main Authors: Inwoong Kim, Cheolhwan Kim, LiKamWa, P.L., Guifang Li
• Format: Journal Article
• Language: English
• Published: New York, NY IEEE 01.04.2005; Institute of Electrical and Electronics Engineers; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: All optical circuits; Applied sciences; Bit rate; Carrier-suppressed return-to-zero (CSRZ); Chromium; Circuit properties; Clock recovery; Clocks; Coding, codes; distributed feedback (DFB) laser; Distributed feedback devices; Dynamics; Electric, optical and optoelectronic circuits; Electronics; Exact sciences and technology; Frequency; Information, signal and communications theory; injection locking; laser dynamics; Laser feedback; laser model; Laser stability; Lasers; Nanostructure; Optical and optoelectronic circuits; optical clock recovery; Optical feedback; Optical packet switching; Phase stability; Power lasers; Signal and communications theory; Simulation; Switching and signalling; Systems, networks and services of telecommunications; Telecommunications; Telecommunications and information theory; Transmission and modulation (techniques and equipments); RZ code; Packet switching; Self-pulsing; Distributed feedback laser; Laser feedback; Information rate; Carrier-suppressed return-to-zero (CSRZ); Injection locking; Optical frequency; Clock; All optical circuit; Information transmission; laser model; laser dynamics; Clock recovery; optical clock recovery; Carrier frequency; Simulation; Optical switching; Phase stability; distributed feedback (DFB) laser; Pseudorandom sequence; Gain; ns range
• ISSN: 0733-8724; 1558-2213
• DOI: 10.1109/JLT.2005.844211

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.