Optical 90 degree hybrid with broad operating bandwidth of 94 nm.
We propose an optical 90 degree hybrid where no waveguide intersection in coupling to balanced photodiodes is required for coherent detection. The proposed device consisting of a paired-interference 2x4 multimode interference (MMI) coupler, a phase shifter, and a 2x2 MMI coupler exhibited quadrature phase response over a 94-nm-wide spectral range.
Jeong
Seok-Hwan
SH
Fujitsu Laboratories Ltd., 10-1 Morinosato-Wakamiya, Atsugi 243-0197 Japan. jeong.sh@jp.fujitsu.com
Morito
Ken
K