Ultrahigh-speed clock recovery with phase lock loop based on four-wave mixing in a traveling-wave laser diode amplifier

Abstract

A new phase lock loop (PLL) is proposed and demonstrated for clock recovery from an ultrahigh-speed time-division multiplexed (TDM) optical signal. A traveling-wave laser-diode amplifier (TW-LDA) is used as a phase detector, and the crosscorrelation component between the optical signal and an optical clock pulse train is detected as a four-wave-mixing (FWM) signal generated in the T W-LDA. A timing clock from a TDM signal is extracted as a prescaled electrical clock, and this prescaled clock is directly recovered from a randomly modulated TDM optical signal. A prescaled 6.3 GHz clock is successfully extracted from a 100 Gb/s signal using the timing comparison output obtained as the cross-correlation between the optical signal and a short ( 4 0 ps) 6.3 GHz optical clock pulse train in the generated FWM light. A comparison of tlhe PLL phase noise with a previously reported gain modulation method is also shown, and the possibility of the Tbit/s operation of this PLL is also considered in the experiments.

All-Optical Switching and Wavelength Conversion Based on Ultrafast Nonlinearities in Semiconductor Optical Amplifiers

“…This value is limited by the residual noise in the output without pump pulse, as well as by the polarization converted pump pulse residue as discussed below eq. (18). It can be derived from eq.…”

“…It has been shown by combining switches based on nonlinear interference effects, that more sophisticated all-optical logic functionalities can be realized. In particular, proof of concept has been given for optical address recognizers, [13][14][15] optical bit-level synchronizers, 16,17) optical clock recovery circuits, 18) optical shift registers with inverters, 19,20) optical memories with read-write abilities, [21][22][23][24] binary half-and full adders, 25,26) pseudorandom number generators, 27) optical parity checkers 28) and optical packet switches. 29) The processing speed of the digital optical logic based on resonant optical transitions as described above is restricted to approximately 200 GHz.…”

Phase Sensitive Signal Processing using Semiconductor Optical Amplifiers

“…In contrast to the materials above operating on variations of the Kerr effect, nonlinearity in SOA's is mediated by carrier excitation enabling signal processing with significantly lower optical power levels [16]. SOAs have been previously demonstrated in many FWM based devices including wavelength conversion [17], clock recovery [18],optical sampling [19] and optical regeneration [20], but very little work has been performed on phase sensitive applications [21,22]. In this paper, we report on the first ever multi-channel regeneration in a semiconductor optical amplifier [22].…”

Dispersion Insensitive, High-Speed Optical Clock Recovery based on a Mode-Locked Laser Diode

“…A number of different OCR methods have been demonstrated [2,3], with the work reported here utilising a ModeLocked Laser Diode (MLLD) [4,5]. The advantage of this method is that when an RZ data stream is injected into the MLLD, it produces a sub-harmonic optical pulse train as an output [4].…”