Optical communications – Multiplex – Wavelength division or frequency division
Reexamination Certificate
2006-02-07
2006-02-07
Chang, Audrey (Department: 2872)
Optical communications
Multiplex
Wavelength division or frequency division
C398S087000, C398S081000, C359S566000, C385S037000
Reexamination Certificate
active
06996343
ABSTRACT:
A dispersion compensator having relatively uniform transmission characteristics over the bandwidth of a communication channel. The compensator is designed to process an optical signal corresponding to the communication channel by decomposing that signal into spectral components, routing different components along different optical paths that impart relative delays between the components, and recombining the delayed components spatially and directionally to generate a processed optical signal with reduced chromatic dispersion. In one embodiment, the compensator includes a diffraction grating optically coupled to a mirror array, in which different mirrors receive light corresponding to different communication channels. For each channel, a desired group delay value is produced by selecting the curvature of the corresponding mirror. A compensator employing independently addressable, variable-curvature mirrors enables generation of variable, channel-specific group delays. A representative compensator of the invention can be designed to generate variable group delays between about +400 and −400 ps
m while maintaining transmission band uniformity of better than about ±0.4 dB over a channel bandwidth of about 60 GHz.
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Chang Audrey
Lucent Technologies - Inc.
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