Abstract
Abstract A design for a 3-dB single-mode Y-junction has been developed and investigated by the beam propagation method with a purpose of decreasing radiation loss in the case of power dividers. The design has two aspects. The first introduces a general design of the boundaries of the 3-dB Y-junction. The second aspect is the replacement of a strip of the guiding material with a lower refractive index near the branching vertex. The design is optimized for low radiation loss, so the output power is increased by 42% over a conventional design.
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