Abstract
A multifunctional polymer asymmetric Mach-Zehnder interferometer electro-optic switch/filter comprising two serial-cascaded phase-generating couplers and a pair of microstrip electrodes is proposed. Due to the optimization on PGC structure with the given nonlinear least square approximation method, the phase compensation condition and extinction ratio (ER) compensation condition are both realized for achieving periodic frequency response. The ON- and OFF-states voltages are 0 and 8.06 V, respectively. The device has two input ports (A1 and B1) and two output ports (A2 and B2), port A2 contains 10 channels numbered from #−7 to #2, and port B2 contains 9 channels numbered from #−7 to #1. As an optical filter (ON-state), the wavelength space of each channel is within 19.2–21 nm (standard value 20 nm) with the maximum period variation less than 1 nm. The insertion loss for channels #−7 to #2 of port A2 is within 2.69–19.3 dB, and that for channels #−7 to #1 of port B2 is within 2.09–20.2 dB. As an EO switch, the ER of each channel between ON-state and OFF-state for port A2 is more than 15.7 dB, and that for port B2 is more than 12.6 dB. Besides, as required in CWDM networks, the device also exhibits favorable thermal stability under the case of large temperature variation.
Published Version
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