Optical: systems and elements – Optical amplifier – Correction of deleterious effects
Reexamination Certificate
2008-04-29
2008-04-29
Hellner, Mark (Department: 3663)
Optical: systems and elements
Optical amplifier
Correction of deleterious effects
C359S337400
Reexamination Certificate
active
11601817
ABSTRACT:
Provided is an apparatus and method for all-optically controlling both a gain and a gain flattening. The apparatus includes: a first amplifier automatically controlling a gain of the apparatus through a feedback loop while amplifying a received optical signal; a fixed gain flattening unit receiving the amplified optical signal from the first amplifier and compensating for the gain according to a wavelength of the received optical signal; and a second amplifier automatically controlling the gain through a feedback loop while amplifying the optical signal input from the fixed gain flattening unit. Accordingly, even if the number of channels of an input WDM optical signal varies, both of a gain and a gain flattening can be all-optically controlled.
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Muhidin Lelic et al.; “Smart EDFA with Embedded Control”; 0-7803-715-4/01/$10.00© 2001 IEEE; pp. 419-420.
Choi Bo Hun
Kim Chang Bong
Ko Je Soo
Lee Sang Soo
Electronics and Telecommunications Research Institute
Hellner Mark
Lowe Hauptman & Ham & Berner, LLP
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