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Push-Pull Drive Method in Linewidth Measurement System with Fiber Type Phase Modulators
Get PDFPush-pull drive method in linewidth measurement systems with fiber type phase modulators is developed. Firstly, we discuss the operation of a fiber type phase modulator. Then the principle of a frequency shifter, which consists of a fiber type phase modulator and a fiber coupler, is described. Secondly, we describe the operation of the push-pull drive method, which arranges an ultrasonic transducer at each end of a fiber loop. Finally, the performance of the push-pull drive method is evaluated by measuring linewidths of several laser diodes. With the push-pull drive method, the carrier component and the second side band components are suppressed by about 10dB
