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
- 17 February 2010
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in Journal of Lightwave Technology
- Vol. 28 (9), 1323-1331
- https://doi.org/10.1109/jlt.2010.2042278
Abstract
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.Keywords
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