Abstract
We present the design, fabrication, and results from the first
monolithically integrated optical phase-locked loop (OPLL) photonic
integrated circuit (PIC) suitable for a variety of homodyne and offset phase
locking applications. This InP-based PIC contains two sampled-grating
distributed reflector (SG-DBR) lasers, semiconductor optical amplifiers
(SOAs), phase modulators, balanced photodetectors, and multimode
interference (MMI)-couplers and splitters. The SG-DBR lasers have more than
5 THz of frequency tuning range and can generate a coherent beat for a wide
spectrum of frequencies. In addition, the SG-DBR lasers have large tuning
sensitivities and do not exhibit any phase inversion over the frequency
modulation bandwidths making them ideal for use as current controlled
oscillators in feedback loops. These SG-DBR lasers have wide linewidths and
require high feedback loop bandwidths in order to be used in OPLLs. This is
made possible using photonic integration which provides low cost, easy to
package compact loops with low feedback latencies. In this paper, we present
two experiments to demonstrate proof-of-concept operation of the OPLL-PIC:
homodyne locking and offset locking of the SG-DBR lasers.
© 2010 IEEE
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