Tunable optical filter

Optical waveguides – With optical coupler – Particular coupling function

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356352, 385 50, 385 72, G02B 638

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active

050730045

ABSTRACT:
A tunable fiber Farby-Perot interferometer includes two aligned ferrule assemblies (22--22) having adjacent end faces separated by a gap. Each assembly includes a mirror (40) disposed transverse to a longitudinal axis (28) of the assembly and embedded internally therein adjacent to the exposed end surfaces which defines the gap. Each ferrule assembly is held in a sleeve (74) disposed in an end fixture (70) with a piezoelectric transducer system (44) extending between end fixtures. Means (82--82) are provided in each end fixture for deforming slightly the sleeve to cause the ferrule assembly disposed therein to be moved into alignment with the other. The transducer system is operated to adjust the length of the gap between the exposed adjacent end faces. Also, the facilities including the transducer system are provided such that a portion or portions of it may be operated selectively to fine tune further the alignment between the fibers.

REFERENCES:
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patent: 4383732 (1983-05-01), Dalgoutte et al.
patent: 4830451 (1989-05-01), Stone
patent: 4861136 (1989-08-01), Stone et al.
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I. P. Kaminow et al., 8th Oct. 1987, Electronics Letters, vol. 23, No. 21, pp. 1102-1103, "FMD-FSK Star Network with a Tunable Optical Filber Demultiplexer".
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D. L. Franzen et al., "Long Optical-Fiber Fabry-Perot Interferometers", Applied Optics, vol. 20, No. 23, Dec. 1, 1981, pp. 3991-3992.
S. Mallinson, "Wavelength-Selective Filters for Singel-Mode Fiber WDM Systms Using Fabry-Perot Interferometers", Applied Optics, vol. 26, No. 3, Feb. 1, 1987, pp. 430-436.
R. Wyatt et al., "20 KHZ Linewidth 1.5 um InGaAsP External Cavity Laser with 55 um Tuning Range", Electronic Letters, vol. 19, No. 3, Feb. 3, 1983, pp. 110-112.
W. Iuma et al., "Control of Mirror Position in a High Precision Intefereometer", Journal of Physical E. Scientific Instruments 1973, pp. 169-170.

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