Optical signal encoding apparatus and decoding apparatus

Details Optical signal encoding apparatus and decoding apparatus Optical signal encoding apparatus and decoding apparatus

2006-05-23

2006-05-23

Lee, John D. (Department: 2874)

Optical waveguides

With optical coupler

Input/output coupler

C385S014000, C385S027000, C385S039000, C398S043000, C398S087000, C398S099000

Reexamination Certificate

active

07050676

ABSTRACT:
There is provided an apparatus for performing, by optical code division multiplex access, at least one of encoding and decoding of wavelength-division-multiplexed light. The apparatus includes: an optical input/output section203for handling input/output of the wavelength-division-multiplexed light; and N fiber gratings (where N is an integer equal to or greater than two)101to103, which are in a series connection to the optical input/output section203. Each of the N fiber gratings has a sampled grating structure having an alternating array of first regions (11to14; 21to24; and31to34) which provide a refractive index modulation with a relatively large amplitude and second regions (201) which provide a refractive index modulation with a relatively small amplitude, the first and second regions being disposed with a constant period P. Each sampled grating structure defines a plurality of reflection wavelength bands which are replicated with a period that is equal to the interval (ΔT) between the central wavelengths of wavelength bands contained in the wavelength-division-multiplexed light. The central values of the respective reflection wavelength bands differ from one fiber grating to another at least during operation.

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