InP/InGaAsP-Based Integrated 3-dB Trench Couplers for Ultra-Compact Coherent Receivers

We present the design, fabrication, and test results for ultra-compact 3-dB frustrated total internal reflection-based trench couplers in an InP/InGaAsP monolithic integration platform. The trench coupler is integrated with phase modulators and a balanced photodiode (BPD) pair to enable a 180° hybri...

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Bibliographic Details
Published inIEEE photonics technology letters Vol. 23; no. 5; pp. 311 - 313
Main Authors Krishnamachari, U, Ristic, S, Chin-Hui Chen, Johansson, L, Ramaswamy, A, Klamkin, J, Norberg, E, Bowers, J E, Coldren, L A
Format Journal Article
LanguageEnglish
Published IEEE 01.03.2011
Subjects
3-dB coupler
Beam splitter
coherent mixing
Couplers
etched slot
frustrated total internal reflection (FTIR)
Modulation
Optical polarization
Optical receivers
Optical reflection
Optical waveguides
trench
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Summary:We present the design, fabrication, and test results for ultra-compact 3-dB frustrated total internal reflection-based trench couplers in an InP/InGaAsP monolithic integration platform. The trench coupler is integrated with phase modulators and a balanced photodiode (BPD) pair to enable a 180° hybrid ultra-compact coherent receiver. Several trench splitter designs exhibit near 3-dB splitting with a loss of 3 dB. The BPD pair is used to characterize coherent mixing of two input optical signals into the trench splitter, and coherence efficiency of 75% is achieved.
ISSN:1041-1135
1941-0174
DOI:10.1109/LPT.2010.2100376