A four-port guided-wave nonsymmetric Mach–Zehnder interferometer based on two hybrid optical couplers is proposed. A potential application of the device is a 0.98 μm/1.55 μm wavelength multiplexer in connection with an optical ring resonator. The proposed device is designed by using the effective indices of the guided modes in a silver ion-exchanged waveguide. The device is fabricated in glass substrate by a two-step ion-exchange process, and it is characterized using a continuous source as well as lasers at λ=1.06, 1.3, and 1.523 μm.
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Wang et al. (1992) studied this question.
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