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BPM DESIGN OF A WIDENED X-BRANCH DEMULTIPLEXER IN A GLASS SUBSTRATE BY K+ ION EXCHANGE FOR λ = 1.31 μm AND λ = 1.55 μm

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Abstract

Since first proposed as a total internal reflection (TIR) device in 1978 [1], X-branch waveguide devices have been studied extensively [2], Their characteristics in terms of the extinction ratio, insertion loss, device dimension prove to be very attractive. The widened X branch (Fig 1) offers the additional advantage of a simpler fabrication process, as there is only one step involved in the ion-exchange. However, in the commonest two mode interference operation region, the requirements on the design parameters of a widened X-branch type demultiplexer are tight, when one wants to achieve wavelength demultiplexing [3], specially in a device made in a glass substrate, which allows little possibilities of an electrooptic adjustment. To find the best point for demultiplexing one can use, the following parameter R [4]:

© 1993 Optical Society of America

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