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Compensation of quadrature imbalance in an optical QPSK coherent receiver.

Fatadin, I M A; Savory, S J*; Ives, D J (2008) Compensation of quadrature imbalance in an optical QPSK coherent receiver. IEEE Photonics Technol. Lett., 20 (17-20). pp. 1733-1735.

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Abstract

This letter explores the Gram-Schmidt orthogonalization procedure (GSOP) for compensation of quadrature imbalance in an optical 90o hybrid. We present computer simulations for an optical QPSK communication system using a digital coherent receiver and investigate the impact of quadrature imbalance on the required optical signal to noise ratio for the receiver and the frequency estimation algorithm. We then demonstrate the improvement which can be achieved using the GSOP, including the impact of quantization in the digital coherent receiver. Finally we show that the GSOP can equally be applied to polarization division multiplexed (PDM) systems, applying the GSOP in conjunction with the constant modulus algorithm to demultiplex a PDM-QPSK signal.

Item Type: Article
Subjects: Optical Radiation and Photonics
Optical Radiation and Photonics > Optical Comms. And Data
Last Modified: 02 Feb 2018 13:15
URI: http://eprintspublications.npl.co.uk/id/eprint/4267

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