Abstract
This study employed the coherent phase modulation (PM) detection method to
characterize the phase noise of a Sampled-Grating Distributed Bragg Reflector (SGDBR)
laser via delayed self-heterodyne (DSH) measurements. We derived the formula for
phase-error variance from the FM noise spectrum of the laser and performed measurements
on the Distributed Feedback (DFB) and SGDBR lasers. The results confirmed that the DFB
laser phase noise is well described by white FM noise while the SGDBR laser has
additional frequency fluctuations below 400 MHz. The measurement and simulation results
also demonstrated that the low frequency excess noise significantly broadens the
linewidth of SGDBR lasers and can degrade the performance of coherent optical
communication systems.
© 2013 IEEE
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