Optical: systems and elements – Optical amplifier – Optical fiber
Reexamination Certificate
2006-01-03
2008-11-18
Bolda, Eric (Department: 3663)
Optical: systems and elements
Optical amplifier
Optical fiber
C359S341400, C359S341420
Reexamination Certificate
active
07453628
ABSTRACT:
In an optical amplifier of the invention, a first variable optical attenuator is provided between a fore-stage optical amplification unit and a post-stage optical amplification unit, and a second variable optical attenuator is also provided on the output side of the post-stage optical amplification unit. When a signal light input level of a WDM light inputted to an input port is lower than a base point level, an attenuation amount of the first variable optical attenuator is not increased (basically minimized), and the control which increases the attenuation amount of the second variable optical attenuator is performed corresponding to the increase in signal light input level. On the other hand, when the signal light input level is higher than the base point level, the attenuation amounts of both the first variable optical attenuator and the second variable optical attenuator are controlled according to the signal light input level. Accordingly, a low-cost WDM optical amplifier having a wide input dynamic range, in which a predetermined signal light output level and flatness of output wavelength characteristics can be kept by the simple control with respect to a fluctuation in signal light input level, can be provided.
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Laurence Lolivier et al.,OFC Technical Digest, “DGE-based Variable Gain EDFA Improves Both Gain Flatness and Noise Figure for a 70° C. Temperature Operating Range,” (Mar. 10, 2005).
Onaka Miki
Sugaya Yasushi
Bolda Eric
Fujitsu Limited
Hanify & King LLP
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