Device for the homodyne reception of optically phase-keyed...

Pulse or digital communications – Receivers – Angle modulation

Reexamination Certificate

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Details

C398S187000

Reexamination Certificate

active

06704375

ABSTRACT:

FIELD OF THE INVENTION
The invention relates to a device for the homodyne reception of optically phase-keyed signals, having a heterodyne receiver, a data discriminator, a frequency acquisition circuit and a local oscillator laser.
BACKGROUND OF THE INVENTION
Various modulating methods for digital signal systems, which operate by phase-keying, are known in telecommunications technology, wherein the carrier recovery required for demodulation can take place, for example, by multiplication, remodulation or with the aid of a Costa control loop. When using such or similar systems in connection with optical systems, the problem of phase regulation of a local laser source often arises, which is relatively expensive.
OBJECT AND SUMMARY OF THE INVENTION
It is therefore the object of the invention to create a device for the homodyne reception of optically phase-keyed signals which leads to a simpler phase regulation of the local laser source.


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Barry et al.,Carrier Synchronization for Homodyne and Heterodyne Detection of Optical Quadriphase-Shift Keying, Journal of Lightwave Technology, vol. 10, No. 12, pp. 1939-1951, (1992).

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