Demodulation of optical DPSK using in-phase and quadrature detection

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Demodulation of optical DPSK using in-phase and quadrature detection

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© The Institution of Electrical Engineers
Published

A 140 Mbit/s optical DPSK system experiment employing a 90 degree optical hybrid to achieve in-phase and quadrature detection is reported. The principle of the optical hybrid is outlined and the effect of polarisation misalignment on the optical performance is compared with that for standard homodyne/heterodyne detection.

Inspec keywords: optical modulation; phase shift keying; optical communication

Other keywords: optical DPSK; in-phase detection; polarisation misalignment; 90 degree optical hybrid; quadrature detection

Subjects: Optical communication

References

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      • T. Brichen , V. Baker . All-fibre polarisation splitter/combiner. Electron. Lett. , 251 - 252
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      • W.R. Leeb . Realisation of 90 and 180 degree hybrids for optical frequencies. Arch. Elektron. & Übertragungstech. , 203 - 206
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      • Davies, A.W., Wright, S.: `A phase insensitive homodyne optical receiver', Digest no. 1985/30, IEE colloquium on advances in coherent optic devices and technologies, 1985, , p. 11/1–11/5.
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      • T.G. Hodgkinson , D.W. Smith , R. Wyatt , D.J. Malyon . Coherent optical fibre transmission systems. Br. Telecom. Technol. J. , 5 - 18
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