Optical: systems and elements – Deflection using a moving element – Using a periodically moving element
Patent
1993-06-18
1995-10-17
Boudreau, Leo H.
Optical: systems and elements
Deflection using a moving element
Using a periodically moving element
359118, 359189, H04B 1000
Patent
active
054595991
ABSTRACT:
An optical transmission system includes a number of transceivers which are mutually connected by means of a network and are provided with a transmitter, a receiver and a local oscillator. Connected to the local oscillator or a second oscillator is a frequency control device for mutually locking the frequency of the additional signal originating from the second oscillator and the frequency of the output signal of the local oscillator. The receiver is provided with an input for feeding at least a portion of the additional signal. At least one receiver is provided with a first mixing device to which the output signal of the local oscillator and at least a portion of the additional signal are fed. Connected to an input of a mixing and splitting device for obtaining mixed signals having mutually orthogonal polarisations is the output of the first mixing device. The received signal is fed to another input of the mixing and splitting device. The outputs of the mixing and splitting device are connected via mixed-signal branches to balanced detectors, one of the balanced detectors being connected to the input of the frequency control device.
REFERENCES:
patent: 5307197 (1994-04-01), Tanabe et al.
patent: 5315425 (1994-05-01), van Deventer et al.
Polarization-diversity Receiver For Heterodyne/coherent Optical Fiber Communications, T. Okoshi et al, published in I00C 1983, Fourth Int. Conf. Integrated Opt. Optical Fiber Commun., Tokyo, Japan, Jun. 1983, Paper No. 30C3-2 Tech. Digest, pp. 386-387.
Polarisation-insensitive Coherent Receiver Using A DOuble Balanced Optical Hybrid System, L. D. Tzeng et al, published in Electronics Letters, vol. 23, No. 22, Oct. 22, 1987, pp. 1195-1196.
Measurement of Excess Sensitivity Penalty Of A Four-diode Polarisation Diversity Coherent Receiver, L. D. Tzeng et al, published in Electroncis Letters, vol. 24, No. 6, Mar. 17, 1988, pp. 330-332.
Abstracts of Japanese Patent Application JA-01-177520, Jul., 1989, Polarized Wave Diversity Light Receiver, NEC. Corp. Shibuya et al.
R. Welter et al, "Sixteen-Channel Coherent Broadcast Network AT 155 Mbit/s", Oct. 1989, pp. 1438-1444, Journal of Lightwave Technology, No. 10.
Boudreau Leo H.
Koninklijke PTT Nederland N.V.
Negash Kinfe-Michael
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