Optical communications – Multiplex – Wavelength division or frequency division
Reexamination Certificate
2004-05-24
2008-08-12
Sedighian, M. R. (Department: 2613)
Optical communications
Multiplex
Wavelength division or frequency division
C398S158000, C398S164000, C398S202000
Reexamination Certificate
active
07412170
ABSTRACT:
A wavelength division multiplexing (WDM) module for transmitting and/or receiving multiple signals simultaneously includes an array of vertical cavity surface emitting lasers (VCSELs) and/or photodetectors, respectively. In the transmitter case, different VCSELs are operated at different wavelengths that change depending on a value of a condition such as temperature and/or one or more other parameters. Multiple VCSELs are assigned to each channel of the WDM. The currently active VCSEL is switched to a different VCSEL assigned to a same channel and preferably having an operating wavelength that is closer to the signal wavelength at the current measured or estimated temperature and/or other parameter value. Multiple photodetectors are assigned to each channel of the WDM, and currently active detector is switched to the second detector within the same channel. A tuning layer and a resonant waveguide grating coupler are preferably integrated into the resonant structure of the VCSEL array and wavelength specific detector array.
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Guilfoyle Peter
Louderback Duane A.
DLA Piper (US) LLP
Opticomp Corporation
Sedighian M. R.
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