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Date of Publication:2010-01-01

Journal:光学学报

Volume:30

Issue:7

Page Number:2098-2103

ISSN No.:0253-2239

Abstract:The time delay characteristics of integrated waveguide microring
   resonator with tunable coupler constructed by the Mach-Zehnder
   interferometer (MZI) is analyzed, and the time delay response function
   is deduced. The results show that the variation of the phase difference
   between the two arms of MZI tunes the equivalent coupling coefficient of
   the microring resonator, and it also changes the additional phase of the
   tunable coupler, which makes the resonant frequency shift of the
   microring resonator. The influence of the discrepancy of coupling
   coefficients of the 3 dB couplers in MZI on the tuning range of the
   equivalent coupling coefficient and the resonant frequency shift of the
   microring resonator is also presented. By amending the phase of ring
   waveguide, the target delay time of 0.6 ns, bandwith of 2 GHz, and delay
   time ripple metric less than 1*10~(-3)ns~2 are obtained with cascaded
   four microring resonators.

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