Tunable-filter control method, tunable-filter control apparatus

Details Tunable-filter control method, tunable-filter control apparatus Tunable-filter control method, tunable-filter control apparatus

1995-10-10

1996-09-03

Boudreau, Leo

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359124, 359110, H04B 1000

Patent

active

055529194

ABSTRACT:
A tunable-filter control method or apparatus tracks a central wavelength in a transmission spectrum of a tunable-filter to a wavelength of light to be received. The central wavelength in the transmission spectrum of the tunable-filter is periodically and minutely modulated. An error signal is generated for use in tracking the central wavelength to the wavelength of the light to be received, by using a tunable-filter output which exhibits the effect of the minute modulation of the central wavelength. A tracking condition, which corresponds to one of a draw-in state and a stable state, is monitored to control the modulation of the central wavelength based on a result of the monitoring, so that a modulation amplitude of the central wavelength in the minute modulation is increased at the time of the draw-in state of the tracking condition and is decreased at the time of the stable state of the tracking condition. A phase of an intensity modulation component of a transmission light transmitted through the tunable-filter may be compared with a phase of a modulation signal used for the minute modulation. In this case, the error signal is generated based on a result of the comparison.

REFERENCES:
patent: 5018130 (1991-05-01), Suzuki et al.
patent: 5483370 (1996-01-01), Takahashi
Patel et al., "Frequency Locking Of A Tunable Liquid-Crystal Filter", Journal Of Applied Physics, vol. 71, No. 5 (New York, US), Mar. 1, 1992, pp. 2464-2466.
Chawki et al., "Multielectrode DFB Lasers used as Tunable FM Receiver at 1.5 .mu.m", Journal Of Optical Communications, vol. 11, No. 3 (Berlin De), Sep. 1990, pp. 98-100.
Miller, C. M., et al., Passively Temperature-Compensated Fibre Fabry-Perot Filter and Its Application in Wavelength Division Multiple Access Computer Network, Electronics Letters, IEE, vol. 26, No. 25, Dec. 6, 1990, pp. 2122-2123.
Terakado, Tomoji, et al., Optical Filter Using DFB-LD, 1985 National Conference on the Institute of Electronics and Communication Engineers of Japan, Semiconductor Devices and Material Section, pp. 1-141, 1985 (and English translation).

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