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

Author

Krishnamachari, Uppiliappan ; Ristic, Sasa ; Chen, Chin-Hui ; Johansson, Leif ; Ramaswamy, Anand ; Klamkin, Jonathan ; Norberg, Erik ; Bowers, John E. ; Coldren, Larry A.

Author_Institution

Electr. & Comput. Eng., Univ. of California, Santa Barbara, CA, USA

Volume

23

Issue

5

fYear

2011

fDate

3/1/2011 12:00:00 AM

Firstpage

311

Lastpage

313

Abstract

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.

Keywords

III-V semiconductors; gallium arsenide; indium compounds; integrated optics; optical beam splitters; optical couplers; optical modulation; optical receivers; phase modulation; photodiodes; 180° hybrid ultra-compact coherent receiver; InP-InGaAsP; balanced photodiode; coherence efficiency; integrated trench couplers; monolithic integration; phase modulators; total internal reflection; trench splitter; 3-dB coupler; Beam splitter; coherent mixing; etched slot; frustrated total internal reflection (FTIR); trench;

fLanguage

English

Journal_Title

Photonics Technology Letters, IEEE

Publisher

ieee

ISSN

1041-1135

Type

jour

DOI

10.1109/LPT.2010.2100376

Filename

5671474