Abstract
A set of recursion equations is developed to synthesize a coherent two-port
lattice-form optical delay-line circuit with different coupler structures.
A fifth-order lattice-form optical interleaver is designed, and parameter
tolerance is analyzed with crosstalk consideration. Results show that the
phase tolerance of delay lines is six times the coupling-coefficient-angle
tolerance of directional couplers. The coupling-coefficient-angle tolerance
of directional couplers in an interleaver with stabilized couplers is improved
by one order than that in an interleaver with simple directional couplers
if global uniformity of the planar-lightwave-circuit process is supposed.
The tolerance of an interleaver with cascaded multimode interference (MMI)
couplers does not improve much, but an MMI coupler is more immune to process
error than a directional coupler. Theoretical analysis meets the simulation
results well. A stabilized coupler and a cascaded MMI coupler are both good
substitutes for a simple directional coupler in lattice-form optical interleaver,
and both help to reduce crosstalk.
© 2006 IEEE
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