Bit rate and wavelength transparent all-optical clock recovery scheme for NRZ-coded PRBS signals

• Published in: IEEE photonics technology letters Vol. 18; no. 7; pp. 844 - 846
• Main Authors: Slovak, J., Bornholdt, C., Kreissl, J., Bauer, S., Biletzke, M., Schlak, M., Sartorius, B.
• Format: Journal Article
• Language: English
• Published: New York IEEE 01.04.2006; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: All-optical processing; Binary sequences; Bit rate; Circuits; Clock recovery; Clocks; Jitter; Lasers; Noise levels; optical clock recovery; Optical filters; Optical signal processing; Preprocessing; self-pulsating laser; Semiconductor lasers; semiconductor optical amplifier (SOA); Semiconductor optical amplifiers; Stimulated emission; Wavelengths
• ISSN: 1041-1135; 1941-0174
• DOI: 10.1109/LPT.2006.871834

All-optical clock recovery from 40-Gb/s nonreturn-to-zero (NRZ) pseudorandom binary sequence data streams based on self-pulsating lasers is presented. A compact preprocessing circuit is utilized to convert an NRZ signal to a pseudoreturn-to-zero sequence before injecting into the optical clock. It comprises a semiconductor optical amplifier followed by a periodical wavelength-division-multiplexing demultiplexer filter. A stable sinusoidal clock signal with a root-mean-square jitter below 700 fs is detected at the output of the self-pulsating laser within data dynamic range of more than 8 dB. The performance of the all-optical clock recovery scheme is investigated by varying the bit rates between 39.81 and 43.02 Gb/s as well as for various wavelengths in the C-band.