Abstract: We demonstrate a 40 Gb/s self-synchronizing, all-optical packet
clock recovery circuit designed for efficient packet-mode traffic. The circuit
locks instantaneously and enables sub-nanosecond packet spacing due to the
low clock persistence time. A low-Q Fabry-Perotfilter is used as a passive
resonator tuned to the line-rate that generates a retimed clock-resembling
signal. As a reshaping element, an optical power-limiting gate is
incorporated to perform bitwise pulse equalization. Using two preamble
bits, the clock is captured instantly and persists for the duration of the data
packet increased by 16 bits. The performance of the circuit suggests its
suitability for future all-optical packet-switched networks with reduced
transmission overhead and fine network granularity.
Abstract: We demonstrate instantaneous 40 Gb/s clock extraction from 1 ns long data packets
separated by 750 ps. The circuit comprises a Fabry-Perotfilter and an all-optical power limiting
gate and requires very short inter-packet guardbands.
Abstract: We demonstrate a simple method for upgrading the repetition rate of 10 GHz optical sources to 40 GHz. It employs a Fabry-Perotfilter and the saturation properties of a Semiconductor Optical Amplifier.
Abstract: Packet clock generation from flag bits is demonstrated, using a Fabry-Perotfilter followed by a semiconductor optical amplifier. Ten clock pulses are generated from a single pulse with less than 0.45 dB amplitude modulation.
Abstract: We present a new technique for extending the decay time of the impulse response function of a Fabry-Perotfilter while simultaneously maintaining a large bandwidth. It involves double passing through the filter and it can be used for the easy multiplication of the repetition rate of optical sources. We apply the concept to a 10-GHz pulse train to demonstrate experimentally the rate quadruplication to 40 GHz.
Abstract: We present recent advances in multi-wavelength, power-equalized laser sources that incorporate a semiconductor optical amplifier (SOA) and simple optical filters, such as Lyot-type and Fabry-Perot, for comb generation. Both linear and ring-cavity configurations are presented, and single-pass optical feedback technique is proposed to improve the performance in terms of the number of simultaneously oscillating lines and output channel power equalization. This technique resulted in a broadened oscillating spectrum of 52 lines spaced at 50 GHz, power-equalized within 0.3 dB. Finally, a simplified version that uses only an uncoated SOA for both gain and comb generation is demonstrated.