Optical wavelength tracking receiver

Details Optical wavelength tracking receiver Optical wavelength tracking receiver

1997-06-04

1998-11-17

Bacares, Rafael

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359125, 359158, H04J 1402

Patent

active

058384707

ABSTRACT:
An optical receiver suitable for use in a wavelength division multiplexing (WDM) system is able to tolerate shifts in the transmitting lasers' wavelength. During a periodically repeated wavelength synchronization phase, only a single transmitter laser is operating, and a peak finder locks onto the wavelength having greatest power and notes the corresponding detector pixel's position. Thus, the receiver knows the relative wavelength of the transmitting laser in terms of the detector pixel illuminated with the brightest light, and can store this information for later reference. The active transmitter lasers take turns synchronizing their wavelengths during successive synchronization phases. During the multi-wavelength data transmission phase, many lasers in the system transmit information at the same time, at different wavelengths. During this phase, each receiver decodes the input from one or a few selected pixels identified previously during the synchronization phase as being associated with a particular selected transmitter.

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