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Optical Engineering

Design and analysis of integrated optic quadrature phase shift keying modulator
Author(s): Kodigenahalli R. Yogesh Prasad; Srinivas Talabattula; D. Venkata Ramana
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Paper Abstract

Quadrature phase shift keying (QPSK) is one of the most popular modulation schemes in coherent optical communication systems for data rates in excess of 40 Gbps because of its high spectral efficiency. This paper proposes a simple method of implementing a QPSK modulator in integrated optic (IO) domain. The QPSK modulator is realized using standard IO components, such as Y-branches and electro-optic modulators (EOMs). Design optimization of EOM is carried out considering the fabrication constraints, miniaturization aspects, and simplicity. Also, the interdependency between electrode length, operating voltage, and electrode gap of an EOM has been captured in the form of a family of curves. These plots enable designing of EOMs for custom requirements. An innovative approach has been adopted in demonstrating the operation of IO QPSK modulator in terms of phase data extracted from beam propagation model. The results obtained by this approach have been verified using the conventional interferometric approach. The operation of the proposed IO QPSK modulator is experimentally demonstrated. The design of IO QPSK modulator is taken up as a part of a broader scheme that aims at generation of QPSK modulated microwave signal based on optical heterodyning.

Paper Details

Date Published: 21 January 2014
PDF: 16 pages
Opt. Eng. 53(1) 015104 doi: 10.1117/1.OE.53.1.015104
Published in: Optical Engineering Volume 53, Issue 1
Show Author Affiliations
Kodigenahalli R. Yogesh Prasad, ISRO Satellite Ctr. (India)
Srinivas Talabattula, Indian Institute of Science (India)
D. Venkata Ramana, ISRO Satellite Ctr. (India)

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