Optical multi-band device with grating

Optical waveguides – With optical coupler – Input/output coupler

Reexamination Certificate

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Reexamination Certificate

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06990273

ABSTRACT:
Apparatus for filtering optical radiation, which apparatus comprises a waveguide (50), and which waveguide (50) comprises a grating (51) having a first reflection wavelength band (52) having a first average wavelength (53) and a first group delay (54), and a second reflection wavelength band (55) having a second average wavelength (56) and a second group delay (57), wherein the first group delay (54) and the second group delay (57) are different in at least a portion of the second reflection wavelength band (55).

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Kashyap, R. et al. “Super-step-chirped fibre Bragg gratings”, Electronics Letters, IEE Stevenage, GB, vol. 32,, No. 15, Jul. 18, 1996, p. 1394-1396, XP006005439; ISSN 0013-5194.

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