OPTIMIZED DESIGN FOR AN EFFICIENT 3-DB SINGLE-MODE Y-JUNCTION

A design for a 3-dB single-mode Y-junction has been developed and inve stigated by the beam propagation method with a purpose of decreasing r adiation loss in the case of power dividers. The design has two aspect s. 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 gu iding 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.