| US 7,554,720 B2 | ||
| Optical transmission apparatus with automatic gain control and automatic level control mode selection | ||
| Yuki Murakami, Kawasaki (Japan); Hideaki Sugiya, Kawasaki (Japan); and Akira Yamamoto, Fukuoka (Japan) | ||
| Assigned to Fujitsu Limited, Kawasaki (Japan) | ||
| Filed on Apr. 20, 2006, as Appl. No. 11/407,170. | ||
| Claims priority of application No. 2005-341314 (JP), filed on Nov. 28, 2005. | ||
| Prior Publication US 2007/0121195 A1, May 31, 2007 | ||
| Int. Cl. H04B 10/17 (2006.01); H04B 10/12 (2006.01) | ||
| U.S. Cl. 359—341.41 [359/341.42] | 10 Claims |
| 1. A transmission apparatus for multiplexing and transmitting a plurality of signal lights, comprising:
optical multiplexer for multiplexing wavelengths of the plurality of signal lights and outputting wavelength multiplexed signal
lights;
optical amplifier being connected at an output a latter stage of the optical multiplexer for operating in one of automatic
gain control mode and automatic level control mode, the automatic gain control mode maintaining a constant gain for the wavelength-multiplexed
signal lights, the automatic level control mode maintaining constant output power for the wavelength-multiplexed signal lights;
and
mode selecting means for selecting the one of the automatic gain control mode and the automatic level control mode for the
optical amplifier based on total optical power of the plurality of signal lights before being subjected to the wavelength
multiplexing of the optical multiplexer and optical power of the wavelength-multiplexed signal lights resulting from the multiplexing
of the optical multiplexer.
|