Abstract
We explore the technique of injection locking a semiconductor
laser with a portion of the received optical signal to regenerate a local
oscillator for eventual use with a homodyne receiver. In addition, we show
that the injection locking process can be electronically stabilized by using
the Modulation Transfer Ratio (MTR) of the slave laser as a monitor, given
either a DFB or Fabry–Pérot slave laser. We show that this stabilization
technique maintains injection lock (given a locking range of ~1 GHz) for laser drift much greater than what is
expected in a typical transmission system. In addition, we
explore the quality of the output of the slave laser, and analyze its suitability
as a local oscillator signal for a homodyne receiver.
© 2008 IEEE
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