Magnetic Control And Plastic Optical Parametric Oscillator Clock Extraction

With the fast expansion of network-scale and the increasing of the transmissionspeeds,3R regeneration (re-timing, re-shaping, re-amplifying) becomes one of the keytechnologies in high speed all optical communications. The research works are asfollows:1. A10Gb/s all optical clock extraction based on magnetically controllable fiberoptical parametric oscillator (MC-FOPO) is demonstrated. The operation properties ofthe magnetic control unit, composed of a solenoid and a magneto-optic crystal of highVerdet constant, are experimentally investigated. By adjusting the drive current of thesolenoid, the magneto-optical crystal unit may serve as a tunable optical fiber delay linewith polarization control to some extent. The experimental results show that theMC-FOPO is capable of repetitively magnetic tunability desirable for all optical clockrecovery.2. A simulation model of two-wavelength clock reshaping via four-wave mixinghas been studied in this paper. A pump which is shared by the two channels of clocksignals is coupled into highly nonlinear fiber with a probe. Interchannel crosstalk offour-wave mixing can be avoided when we add a time delay into one channel toseparate the two clocks. Two idles generated via four-wave mixing are reshaped clock.The relation between duty cycles of the input clocks and the quality of reshaped clockshas been studied. We also investigate the relation of the relative amplitude jittersbetween input clock signal and output clock signal under optimum duty cycles.3. A toroid coil is designed for optical clock extraction with magnetic tunability offiber optical parametric oscillators, which is used in MC-FOPOs. The distribution of themagnetic field inside the toroid coil is derived by finite element method. The impacts oftoroid coil radius, thickness of the turns, cross section on the magnetic field are alsoanalysed. According to the derivation, detailed parameters of the needed toroid coil aregive out.