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1. (WO1998015859) OPTICAL WAVEGUIDE FILTERS

Pub. No.:    WO/1998/015859    International Application No.:    PCT/GB1997/002769
Publication Date: Apr 16, 1998 International Filing Date: Oct 8, 1997
IPC: G02B 6/34
Applicants: NORTHERN TELECOM LIMITED
ROBINSON, Alan
Inventors: ROBINSON, Alan
Title: OPTICAL WAVEGUIDE FILTERS
Abstract:
A distributed Bragg reflection pass-band filter in an optical fibre waveguide (170) is provided by grating elements (172) arranged to provide improved flatness of reflection pass-band, a high rate of roll-off, and reduced amplitude side-bands by the use of nonlinear chirp and apodisation profiles that are related such that the square of the coupling coefficient is substantially proportional to the rate of change of chirp.