Pulse or digital communications – Receivers – Angle modulation
Reexamination Certificate
1999-07-28
2004-03-09
Bayard, Emmanuel (Department: 2631)
Pulse or digital communications
Receivers
Angle modulation
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.
REFERENCES:
patent: 4037171 (1977-07-01), Cordell
patent: 4423390 (1983-12-01), Waters
patent: 5007106 (1991-04-01), Kahn et al.
patent: 5247382 (1993-09-01), Suzuki
patent: 5323258 (1994-06-01), Tsushima et al.
patent: 5359613 (1994-10-01), Mols et al.
patent: 5396361 (1995-03-01), Sasaki et al.
patent: 5422752 (1995-06-01), Hardcastle
patent: 5471660 (1995-11-01), Masaki
patent: 5510922 (1996-04-01), Naito
patent: 5510927 (1996-04-01), Noe
patent: 5568305 (1996-10-01), Naito et al.
patent: 5572351 (1996-11-01), Hadjifotiou
patent: 5657307 (1997-08-01), Taneya et al.
patent: 5687261 (1997-11-01), Logan
patent: 5887247 (1999-03-01), Baltus et al.
patent: 6008931 (1999-12-01), von Helmolt et al.
patent: 4110138 (1992-03-01), None
patent: 535494 (1993-04-01), None
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).
Bayard Emmanuel
Contraves Space AG
Hynes William Michael
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