Patent ID: 9413465
Filing Date: 2016-08-09
CPC Classification: H04B,H04J

Claim Text:
1. An optical transmission system comprising: a transmission-side integrated optical circuit to output a wavelength division multiplexed signal with light components of different wavelengths combined therein to an N-link transmission path; a receiving-side integrated optical circuit to receive the wavelength division multiplexed signal from the transmission path, and a control circuit connected to the transmission-side integrated optical circuit and the receiving-side integrated optical circuit, wherein the transmission-side integrated optical circuit has a multi-wavelength light source, a photo coupler to split light of each wavelength output from the multi-wavelength light source into N branches, an optical modulator to modulate a group of light components split from the respective wavelengths by different data signals, and an optical wavelength multiplexer to multiplex the modulated light components of the different wavelengths into the wavelength division multiplexed signal, and wherein the receiving-side integrated optical circuit has wherein the control circuit controls an output power level of the multi-wavelength light source and gains of the N optical amplifiers, based upon intensities of the signal light components detected by the photo detectors, and wherein the control circuit has a received light monitor to monitor the intensities of the signal light components detected by the photo detectors and determine optical losses of the respective links of the transmission path; a first calculation part to calculate and store the gains for the N optical amplifiers as a function of the output power level of the multi-wavelength light source, based upon the optical losses of the respective links; a second calculation part to calculate and store power consumption amounts of the multi-wavelength light source and power consumption amounts of the N optical amplifiers as a function of the output power level of the multi-wavelength light source, based upon the output power level of the multi-wavelength light source and the gains for the N optical amplifiers; and a determination part to determine a new output power level of the multi-wavelength light source based upon a total power consumption summing up the power consumption of the multi-wavelength light source and the power consumption of the N optical amplifiers.