Optical waveguides – With optical coupler – Input/output coupler
Patent
1996-06-20
1997-12-02
Lee, John D.
Optical waveguides
With optical coupler
Input/output coupler
G02B 634
Patent
active
056945027
ABSTRACT:
A method of generating a Bragg reflective grating in a photosensitive optical waveguide using a fringe pattern of electromagnetic radiation additionally employs a further beam of radiation to promote differential heating of the fibre in the region where the grating is being generated. The differential heating produces differential photo-sensitivity of the fibre so that the resulting grating, though it has a constant physical pitch, has an effective optical pitch that is a function of position along the length of the grating.
REFERENCES:
patent: 5327515 (1994-07-01), Anderson et al.
patent: 5495548 (1996-02-01), Bilodeau et al.
Meltz, "Bragg grating formation and germanosilicate fiber photosensitivity" Int'l Workshop of Photoinduced Self-Organization Effects in Optical Fiber, SPIE, vol. 1516, 1991, pp. 185-199.
Rourke, "Fabrication and characterisation of long, narrowband fibre gratings by phase mark scanning", Electronics Letters, vol. 30, No. 16, Aug. 4, 1994, pp. 1341-1342.
Kang Ellen Eunjoo
Lee John D.
Northern Telecom Limited
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