Abstract
We propose a novel optical 90$^{\circ}$ hybrid consisting of a
paired-interference based 2$\,\times\,$4 multimode interference (MMI) coupler, a phase
shifter and a 2$\,\times\,$2 MMI coupler. We theoretically clarified that the proposed
device shows superior performances to a conventional 4$\,\times\,$4 multimode
interference coupler from the viewpoint of a wavelength sensitive loss and an operating
bandwidth. We fabricated the proposed 90$^{\circ}$ hybrid using a deep-ridge waveguide
with a GaInAsP/InP material system, and experimentally demonstrated quadrature phase
response with a low interchannel imbalance, a high common-mode rejection ratio
($> 20$ dB) and a low phase deviation $(<5^{\circ})$ over 94-nm-wide
spectral range.
© 2010 IEEE
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