Affiliation:
1. Anqing Normal University
Abstract
A 90° optical hybrid (OH) based on a
4
×
4
multimode interference (MMI) coupler is characterized and analyzed using the silica-based planar light circuit. The OH is designed to be polarization-insensitive with an extremely low polarization-dependent loss (
<
0.18
d
B
) and phase error (
w
i
t
h
i
n
±
1
.
3
∘
)
. The fabricated chip exhibits an excess loss of 3.4 dB and 3.8 dB for TE and TM polarizations at 1550 nm. The measured phase error is
w
i
t
h
i
n
±
7
.
2
∘
over 50 nm in the
C
+
L
band with a polarization-dependent error
w
i
t
h
i
n
±
3
.
5
∘
. The fabrication tolerance of the MMI width and waveguide sidewall angle is analyzed, which can well explain the deviation from the theoretical calculation.
Funder
Natural Science Foundation of Anhui Province
Provincial Foundation for Excellent Young Talents of Colleges and Universities of Anhui Province
State Key Laboratory on Integrated Optoelectronics
Scientific Research Foundation of Education Department of Anhui Province of China
Subject
Atomic and Molecular Physics, and Optics,Engineering (miscellaneous),Electrical and Electronic Engineering
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