Automatic optical heterodyne phase lock by microcomputer-assisted loop filter

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Abstract

<p>This paper demonstrates signal light carrier automatic pull-in and phase-lock to an optical frequency comb reference by our newly developed microcomputer-assisted phase-lock loop circuit. The microcomputer utilizes a binary-search algorithm to alter the oscillation frequency of the slave laser and achieve rapid pull-in to the master laser. It achieves automatic phase-locking time of 0.45 msec when the laser-diode frequency lies within the pull-in range of ±100 MHz. The single side band phase noise is just 1.8° at offset frequencies from 10 Hz to 5 MHz. This phase noise value is not expected to cause any power penalty with QPSK modulation.</p>

Journal

  • IEICE Communications Express

    IEICE Communications Express 5 (12), 448-453, 2016

    The Institute of Electronics, Information and Communication Engineers

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