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Novel Optical 90 ^{\circ} Hybrid Consisting of a Paired Interference Based 2 ,\times, 4 MMI Coupler, a Phase Shifter and a 2 ,\times, 2 MMI Coupler

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2 Author(s)
Seok-Hwan Jeong ; Fujitsu Laboratories Ltd., Atsugi, Japan ; Ken Morito

We propose a novel optical 90?? hybrid consisting of a paired-interference based 2 ?? 4 multimode interference (MMI) coupler, a phase shifter and a 2 ?? 2 MMI coupler. We theoretically clarified that the proposed device shows superior performances to a conventional 4 ?? 4 multimode interference coupler from the viewpoint of a wavelength sensitive loss and an operating bandwidth. We fabricated the proposed 90?? hybrid using a deep-ridge waveguide with a GalnAsP/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??) over 94-nm-wide spectral range.

Published in:

Journal of Lightwave Technology  (Volume:28 ,  Issue: 9 )