Method for setting the local oscillator of an optical superheter

Details Method for setting the local oscillator of an optical superheter Method for setting the local oscillator of an optical superheter

1994-09-19

1996-04-23

Boudreau, Leo

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359192, H04B 1006

Patent

active

055109276

ABSTRACT:
Novel structure and methods for tuning the local oscillator of an optical superheterodyne receiver are disclosed. In a first method, the value of the local oscillator frequency at which the maximum of the chronological average of the output signal from the demodulator occurs is used to set the local oscillator frequency. An alternate method first and second discriminators are used to receive the intermediate frequency signal. The separate discriminator characteristics of the first and second frequency discriminators are used in setting the local oscillator frequency.

REFERENCES:
patent: 4868896 (1989-09-01), Pietzsch
patent: 4965857 (1990-10-01), Auracher et al.
Abbas, A Dual-Detector Optical Heterodyne Receiver for Local Oscillator Noise Suppression.
"Mark Density, Polarization Insensitive Frequency Tracking System for Optical FSK Transmission", by Takamasa Imai, et al., NTT Transmission Systems Laboratories, pp. 50-51, Proc I.O.O.C. 1989 Kobe, Japan, Paper 18, C2-6.
"ECOC 88", Fourteenth European Conference on Optical Communication Sep. 11-15, 1988, Part 1.
"Comparison of Polarization Handling Methods in Coherent Optical Systems", by Reinhold Noe, et al, Journal of Lightwave Technology, vol. 9, No. 10, Oct. 1991, pp. 1353-1366.
"Polarisation-Insensitive, 500 Mbit/s FSK Transmission Over 153 km by Passive Polarisation Switching" Electronics Letters, Jan. 5, 1989, vol. 25, No. 1, pp. 4-5.

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