EP0074152A1
Expired / Lapsed
EP
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Adjustable optical demultiplexer
Assignee: Koninklijke Philips NV
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Filing: 1982-09-06
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Granted: —
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Expires: 2002-09-06
Abstract
Abstract The invention relates to an optical demultiplexer whose "colour band" is adjustable, so that the demultiplexer can always be adapted to future P.T.T. standards. The adjustment is performed either by tilting the optical grating (33) with respect to the light beam incident thereon or by deflecting the light by means of a liquid crystal arranged in the light beam.
Inventors
- 👤 Giok Djan Khoe
- 👤 Antonius J.A. Nicia
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-02 21:15
CPC Classifications
G; G02; G02B; G02B6/00; G02B6/24; G02B6/26; G02B6/28; G02B6/293; G02B6/29304; G02B6/29305; G02B6/29313; G02B6/29314; G02B6/27; G02B6/2706; G02B6/29379; G02B6/2938; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/1313; G02B6/2931; G02B6/29311
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
109 words
An optical demultiplexer which comprises an optical input fibre for transporting a plurality of light signals of different wavelengths, a wavelength-selective member, at least one output member for receiving a light signal in a given waveband, and a lens system which is arranged between the wavelength-selective member on one hand and the input fibre and the output member on the other hand, the arrangement being such that between the input fibre and the output member there exists a low-loss transmission path which is dependent on the wavelength of the light, characterized in that the orientation of the wavelength-selective member with respect to a light beam incident thereon is adjustable.
Claim 2
Dependent Claim
109 words
An optical demultiplexer which comprises an optical input fibre for transporting a plurality of light signals of different wavelengths, a wavelength-selective member, at least one output member for receiving a light signal in a given waveband, and a lens system which is arranged between the wavelength-selective member on one hand and the input fibre and the output member on the other hand, the arrangement being such that between the input fibre and the output member there exists a low-loss transmission path which is dependent on the wavelength of the light, characterized in that the orientation of the wavelength-selective member with respect to a light beam incident thereon is adjustable.
Claim 3
Dependent Claim
28 words
An optical demultiplexer as claimed in Claim 1, characterized in that the wavelength-selective member is rotatable with respect to the lens system by means of an adjusting screw.
Claim 4
Dependent Claim
23 words
An optical demultiplexer as claimed in Claim 1, characterized in that light-deflecting means is arranged between the lens system and the wavelength-selective member.
Claim 5
Dependent Claim
21 words
An optical demultiplexer as claimed in Claim 3, characterized in that the light deflecting means comprises an electrically controllable nematic crystal.
Claim 6
Dependent Claim
36 words
An optical demultiplexer as claimed in any of the preceding Claims, characterized in that between the lens system and the wavelength-selective member there is arranged an optical device for converting non-polarized light into linearly polarized light.
Claim 7
Dependent Claim
67 words
An optical demultiplexer as claimed in Claim 1, 2, 3, 4 or 5 in which the output member is formed by an optical output fibre, characterized in that the diameter of the light-conductive core of the output fibre is at least twice as large as the diameter of the light-conductive core of the input fibre, a diaphragm being arranged between the output fibre and the wavelength-selective member.
Claim 8
Dependent Claim
45 words
An optical demultiplexer as claimed in Claim 6, characterized in that the diaphragm is an adjustable slit diaphragm in which the slit direction extends at right angles to the connecting line between the optical axis of the input fibre and that of the output fibre.
References Cited (Backward Citations)
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