EP0191235A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Optical fibre coupler
Assignee: Nortel Networks Optical Components Ltd
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Filing: 1985-12-13
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Granted: —
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Expires: 2005-12-13
Abstract
Abstract Polartsation beam splitters/combiners or polarisation insensitive beam splitters/combiners are manufactured from low or zero birefringence single mode optical fibre, rather than high birefringence fibre, by using a differential pulling technique to induce the appropriate amount of form birefringence.
Inventors
- 👤 Terry Bricheno
- 👤 Vernon Baker
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-24 18:29
CPC Classifications
G; G02; G02B; G02B6/00; G02B6/24; G02B6/26; G02B6/27; G02B6/2726; G02B6/274; G02B6/2753; G02B6/2773; G02B6/28; G02B6/2804; G02B6/2821; G02B6/2835; G02B6/2843
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
14 words
A polarisation beam splitter/combiner formed from low or zero birefringence single mode optical fibre.
Claim 2
Dependent Claim
14 words
A polarisation beam splitter/combiner formed from low or zero birefringence single mode optical fibre.
Claim 3
Dependent Claim
15 words
A polarisation insensitive beam splitter/combiner formed from low or zero birefringence single mode optical fibre.
Claim 4
Dependent Claim
15 words
A polarisation insensitive beam splitter/combiner formed from low or zero birefringence single mode optical fibre.
Claim 5
Independent Claim
45 words
A method of manufacturing a polarisation beam splitter/combiner, or polarisation insensitive beam splitter/combiner from low or zero birefringence single mode fibre including employing a heating and differential pulling technique to induce form birefringence and wherein the achieved form birefringence is controlled by the temperature employed.
Claim 6
Independent Claim
45 words
A method of manufacturing a polarisation beam splitter/combiner, or polarisation insensitive beam splitter/combiner from low or zero birefringence single mode fibre including employing a heating and differential pulling technique to induce form birefringence and wherein the achieved form birefringence is controlled by the temperature employed.
Claim 7
Independent Claim
62 words
A method manufacturing a polarisation beam splitter/combiner, or a polarisation insensitive beam splitter/combiner, from low or zero birefringence single mode fibre by means of a differential pulling technique including the step of determining the end point thereof by monitoring light from the output ports of the splitter/combiner for the separation of both orthogonal polarisation states, or the occurrence of unpolarised states, respectively.
Claim 8
Independent Claim
62 words
A method manufacturing a polarisation beam splitter/combiner, or a polarisation insensitive beam splitter/combiner, from low or zero birefringence single mode fibre by means of a differential pulling technique including the step of determining the end point thereof by monitoring light from the output ports of the splitter/combiner for the separation of both orthogonal polarisation states, or the occurrence of unpolarised states, respectively.
References Cited (Backward Citations)
No citation records indexed.
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