Invention Grant
- Patent Title: Multistage optical amplifier with gain control using pump ratio
- Patent Title (中): 具有增益控制的多级光放大器使用泵比
-
Application No.: US12213565Application Date: 2008-06-20
-
Publication No.: US07929201B2Publication Date: 2011-04-19
- Inventor: Tatsuya Tsuzuki , Norifumi Shukunami , Yuji Tamura , Yoshio Shimano , Masao Nakata , Takashi Satou
- Applicant: Tatsuya Tsuzuki , Norifumi Shukunami , Yuji Tamura , Yoshio Shimano , Masao Nakata , Takashi Satou
- Applicant Address: JP Kawasaki
- Assignee: Fujitsu Limited
- Current Assignee: Fujitsu Limited
- Current Assignee Address: JP Kawasaki
- Agency: Staas & Halsey LLP
- Priority: JP2007-163391 20070621
- Main IPC: H04B10/17
- IPC: H04B10/17 ; H04B10/12

Abstract:
According to an aspect of the embodiment of the invention, an optical amplifier including an input port, an output port, a plurality of amplifying parts, an optical attenuator, a gain controller and an optical attenuator controller. The plurality of amplifying parts includes an optical amplification medium and a pumping light source for generating pump light. The optical attenuator is optically connected between the amplifying parts. The gain controller controls the pump light power of the pump sources, respectively, in such a way that the ratio decreases in accordance with the gain set value increasing and the ratio interpose between a first threshold level and a second threshold level. The optical attenuator controller controls attenuation of the optical attenuator in order to maintain the sum of generating gains of the amplifying parts in the gain set value in accordance with a state of the signal light inputted into the input port.
Public/Granted literature
- US20080316591A1 Optical amplifier Public/Granted day:2008-12-25
Information query