High capacity wavelength division multiplexer

Details High capacity wavelength division multiplexer High capacity wavelength division multiplexer

1997-11-04

2000-05-09

Pascal, Leslie

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359187, H04J 1402

Patent

active

060611588

ABSTRACT:
Method and apparatus for spatially combining a large number of optical signals of different wavelengths carried on optical fibers (12) from laser sources (10). A dispersive optical device, disclosed as a grating (16), combines the multiple signals into a composite beam. Then a sample of the composite beam is analyzed by passing it through tunable etalon (26) and onto a sensor (30). The etalon (16) is successively tuned to passbands, each of which corresponds to the wavelength of each of the optical signals in turn. The sensor (30) measures angular deviation of each beam caused by wavelength changes, and generate control signals (on lines 36) to adjust each wavelength at its laser source. Thus the apparatus provides for reliable multiplexing of a relatively large numbers of laser sources (10), while the etalon (16) and sensor (30) operate in conjunction with a controller (32), which also generates wavelength control signals for the lasers (10), to ensure accurate beam alignment and more efficient multiplexing.

REFERENCES:
patent: 4942568 (1990-07-01), Khoe et al.
patent: 5978119 (1999-11-01), Giles et al.
patent: 5995255 (1999-11-01), Giles

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