초록 ▼

A trunk apparatus prevents a signal error due to a fluctuation in an optical power in a WDM communication system. A monitoring and controlling signal transmitting and receiving circuit sends transmission power information regarding a transmission power monitored by a transmission power monitor to an

A trunk apparatus prevents a signal error due to a fluctuation in an optical power in a WDM communication system. A monitoring and controlling signal transmitting and receiving circuit sends transmission power information regarding a transmission power monitored by a transmission power monitor to an immediately proceeding trunk apparatus located on a downstream side of the local trunk apparatus. The monitoring and controlling signal transmitting and receiving circuit receives the transmission power information sent from an immediately preceding trunk apparatus located on an upstream side, and sends the received transmission power information to an automatic gain control circuit. The automatic gain control circuit controls the optical amplifier based on the transmission power information received from the immediately preceding trunk apparatus so as to equalize the transmission power of the local trunk apparatus to the transmission power of the immediately preceding trunk apparatus.

대표청구항 ▼

1. A local trunk apparatus of a wavelength-division-multiplex communication system comprises:an optical amplifier; a transmission power monitor for monitoring a transmission power of said local trunk apparatus; a monitoring and controlling signal transmitting and receiving circuit for transmitting a

1. A local trunk apparatus of a wavelength-division-multiplex communication system comprises:an optical amplifier; a transmission power monitor for monitoring a transmission power of said local trunk apparatus; a monitoring and controlling signal transmitting and receiving circuit for transmitting and receiving a monitoring and controlling signal; and an automatic gain control circuit for performing an automatic gain control with respect to said optical amplifier; wherein said monitoring and controlling signal transmitting and receiving circuit sends transmission power information regarding the transmission power monitored by said transmission power monitor to an immediately proceeding trunk apparatus located on a downstream side of said local trunk apparatus; said monitoring and controlling signal transmitting and receiving circuit receives transmission power information sent from an immediately preceding trunk apparatus located on an upstream side of said local trunk apparatus, and sends the received transmission power information to said automatic gain control circuit; and said automatic gain control circuit controls said optical amplifier based on the transmission power information received from the immediately preceding trunk apparatus and reception power information regarding reception power at said local trunk apparatus, so as to equalize the transmission power of said local trunk apparatus to the transmission power of said immediately preceding trunk apparatus in consideration of changes in a loss of a transmission path between said local trunk apparatus and said immediately preceding trunk apparatus.