Optical: systems and elements – Optical amplifier – Correction of deleterious effects
Reexamination Certificate
2005-07-12
2005-07-12
Hellner, Mark (Department: 3663)
Optical: systems and elements
Optical amplifier
Correction of deleterious effects
C359S337110
Reexamination Certificate
active
06917467
ABSTRACT:
A programmable amplifier100operable to independently adjust the amplification given to various optical signals passing through an optical fiber. An input optical fiber102provides a number of optical signals to a demultiplexer which separates each signal carried by the input fiber102.Each individual wavelength travels to a variable attenuator106which lowers the signal strength of each signal based on an input from the system controller108.The attenuated signals are combined by multiplexer112and input to an optical amplifier114.The optical amplifier114receives the combined signal and amplifies each signal in the combined DWDM signal across the entire bandwidth of the amplifier114.The amplified signals are input to a splitter116which removes a small portion of the entire spectrum output by the amplifier114.The remaining portion of the signal passes to an output fiber110and travels to the remainder of the optical network. The small portion of the signal separated by the splitter116is input to a spectrum analyzer118which detects the signal strength of each component signal traveling through the optical amplifier100.Signal strength information is passed to the system controller108.The system controller108,typically a digital signal processor or programmable microcontroller, uses the information from the spectrum analyzer118to control the variable attenuators and the gain of amplifier114in order to level the various signals traveling through the amplifier100.
REFERENCES:
patent: 6373622 (2002-04-01), Kosaka
patent: 6633430 (2003-10-01), Monnard et al.
Duncan Walter M.
Howell Thomas Russell
Rancuret Paul L.
Brady III Wade James
Brill Charles A.
Hellner Mark
Telecky , Jr. Frederick J.
Texas Instruments Incorporated
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