Optical clock recovery from 10‐Gb/s NRZ signal after propagation on 100 km of DS, NZD or SR installed fiber

Abstract

An optical clock has been experimentally recovered by an actively mode-locked fiber ring based on a semiconductor optical amplifier (SOA) from a 10-Gb/s NRZ data stream after propagation on 100 km of installed fiber (either DS, or NZD, or SR). The results indicate the flexibility and robustness of the technique, which seems well suited for application in optical networks. (C) 2005 Wiley Periodicals, Inc

All-Optical RZ Data Conversion With Temporally and Spectrally Gain-Sliced Semiconductor Optical Amplifier Via Broadband Optical Injection

“…By using special techniques such as gain clamping, optical injection, cross-phase modulation, nonlinear polarization rotation [1]- [3], [5]- [7], [13], four-wave mixing [23], crossgain modulation (XGM) [20], bandpass filtering [30], loopmirror [15], [17], [19], and interferometer [8], [21], [29], the transformation between non-return-to-zero (NRZ) and returnto-zero (RZ) formats or between NRZ ON-OFF keying (NRZ-OOK) and RZ quadrature phase shift keying (RZ-QPSK) formats can be implemented. Other speculated functions including all-optical clock-recovery [9], [10], [12], [16], [17], [22], 3R regeneration [11], and wavelength-division multiplexing (WDM) multicasting [31] have also been involved together with the data format converter to extend the feasibility of such device for versatile applications. To date, the operational bit rates extending from 10 to 40 Gb/s have previously been demonstrated [2], [3], [6], [13]- [17].…”