Research Of Fiber Optic Four-wave Mixing Regeneration Technologies

All-optical regeneration techniques based on fiber optic four-wave mixing (FWM),could achieve the all three aspects of all-optical signal regeneration as re-amplification,re-shaping and re-timing. Their properties of femtosecond response speed, THzfrequency bandwidth and optically controlled not only improve the exchange rate ofoptical communication network greatly but also suitable for DWDM systems. Itbecomes one of the important research directions for future high-speed all-opticalnetwork. This paper studies fiber-optic parametric2R regenerator (FOPR) andall-optical clock recovery based on fiber-optic parametric oscillator (FOPO). The maincontent as follows:1. The principles and characteristics of FWM are analyzed, for the actions used in(FOPR) and FOPO-based clock recovery. In addition, the principle of FOPR is given inview of power transfer characteristics and principle of FOPO-based clock recovery unitis given from the perspective of the mode-locked loop oscillator. The job providetheoretical basis for the future design of FOPR and FOPO.2. The operating principle and design criterion of data-pump fiber-optic parametric2R regenerators (FOPRs) are described. A degenerate four-wave mixing (FWM)-basedFOPR is designed by simulation from pump bandwidth, wavelength configuration ofthe probe continuous wave and power transfer function (PTF) perspectives. Thenecessity of using the power control unit in FOPRs for the regeneration performance isproved in view of theoretic and simulation. And then, an all-optical2R regenerator isdeveloped. The measurement results show that, the PTF slope is about1.7with theextinction ratio (ER) improvement of about5dB, and the experimental data areconsistent with the simulation results. The regenerator will be used to build the opticalpacket switching (OPS) system for single-channel2R signal regeneration.3. An all-optical clock recovery simulation platform based on OptiSystem at40Gbps is completed. Theoretical and simulation studies of FOPO clock extraction unitare done from the oscillation conditions, mode-locking conditions, the clock extraction conditions and FOPA gain saturation characteristics. To be able to realize clock recovery,reduce influence from randomness of pump signal, the FOPO should be formed atFOPA s zero gain point. In assistance of the equivalent model of FOPO and FOPA gainsimulation result, one would overall grasp a FOPO have a strong reference for FOPO sgain or loss setting. Then, based on the simulation platform,the measurement resultshows, when the pseudo-random bit sequence (PRBS)1code occurrence probability is0.5, the recovered clock pulse width is compressed by50%or more to the input signal,and its extinction ratio reaches15dB, the peak jitter is about1.6dB. The influence of1code occurrence probability is also be tested, it shows, the large is the1codeoccurrence probability, the better is the recovered clock quality.