Abstract

We propose an optical 90° hybrid where no waveguide intersection in coupling to balanced photodiodes is required for coherent detection. The proposed device consisting of a paired-interference $2\times 4$ multimode interference (MMI) coupler, a phase shifter, and a $2\times 2$ MMI coupler exhibited quadrature phase response over a $94\text{-}\mathrm{nm}$-wide spectral range.

© 2009 Optical Society of America

Compact optical 90° hybrid employing a tapered 2×4 MMI coupler serially connected by a 2×2 MMI coupler

Seok-Hwan Jeong and Ken Morito
Opt. Express 18(5) 4275-4288 (2010)

Optical 60° hybrid for demodulating six-level DPSK signal

Seok-Hwan Jeong and Ken Morito
Opt. Lett. 36(3) 322-324 (2011)

Compact optical 90° hybrid based on a wedge-shaped 2 × 4 MMI coupler and a 2 × 2 MMI coupler on a thin-film lithium niobate platform

Yake Chen, Xiaojun Xie, Yang Sun, Wei Pan, and Lianshan Yan
Opt. Lett. 49(5) 1145-1148 (2024)

Ultra-compact optical 90° hybrid based on a wedge-shaped 2 × 4 MMI coupler and a 2 × 2 MMI coupler in silicon-on-insulator

Wei Yang, Mei Yin, Yanping Li, Xingjun Wang, and Ziyu Wang
Opt. Express 21(23) 28423-28431 (2013)

Simple analytical calculation and experimental demonstration of optical 90° hybrids based on tapered 2×4 and 2×2 multimode interference couplers

Seok-Hwan Jeong and Ken Morito
J. Opt. Soc. Am. B 28(1) 159-164 (2011)