Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Reexamination Certificate
2005-06-07
2005-06-07
Luu, Thanh X. (Department: 2878)
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
C359S341420, C359S337000
Reexamination Certificate
active
06903324
ABSTRACT:
Wavelength multiplexed light is amplified by first and second EDFs. Gains of the first and the second EDFs are respectively held to be predetermined values by first and second AGC circuits. Between the first and the second EDFs, a variable attenuator is arranged. A loss in the variable attenuator is controlled by an ALC circuit so that output power is held to be a predetermined value instructed by a supervisory control signal. Respective time constants of the first and the second AGC circuits are sufficiently short in comparison with the response times of the first and the second EDFs. The time constant of the ALC circuit is sufficiently long in comparison with the time period required to transmit the supervisory control signal to each optical node.
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Maeda Takuji
Shukunami Norifumi
Suzuki Yuichi
Tomofuji Hiroaki
Tsuzuki Tatsuya
Fujitsu Limited
Luu Thanh X.
Staas & Halsey , LLP
Yam Stephen
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