Maintenance of optical networks

Details Maintenance of optical networks Maintenance of optical networks

1997-02-28

1998-09-01

Pascal, Leslie

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359110, 359133, 359161, 359177, H04J 1402, H04B 1016

Patent

active

058018638

ABSTRACT:
An apparatus is provided for adding a dither signal to an optical carrier modulated with an information signal. The apparatus includes a dithering element having an input and an output in series with an optical carrier modulated with an information signal. A differential element having an inverting input, a non-inverting input, and an output is coupled to the input of the dithering element. A signal generator, which is provided for producing a desired dither signal to be added to the modulated optical carrier, is coupled to the non-inverting input of the differential element. A feedback element produces a signal related to the output of the dithering element and couples the signal related to the output of the dithering element to the inverting input of the differential element.

REFERENCES:
patent: 5276543 (1994-01-01), Olshansky
patent: 5296956 (1994-03-01), Fatehi et al.
patent: 5317439 (1994-05-01), Fatehi
patent: 5436750 (1995-07-01), Kawano
patent: 5654816 (1997-08-01), Fishman
Appl. Phys. Lett. 56(3), 15 Jan. 1990, 1990 American Institute of Physics, "Polarization-independent acoustically tunable optical filter" by D. A. Smith et al., pp. 209-211.
Appl. Phys. Lett. 53(1), 4 Jul. 1988, 1988 American Institute of Physics "Poloarization-independent electro-optically tunable narrow-band wavelength filter" by W. Warzanskyj et al., pp. 13-15.

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