Patent ID: 8032035
Filing Date: 2011-10-04
Classification: G01J,H05B,Y02B

Abstract:
1. A light detecting apparatus comprising: a wavelength-specification storage unit that stores a wavelength specified based on transmittance and reflectance of light in association with the transmittance and the reflectance; a driving-current storage unit that stores a driving current value indicating a current value required for driving a semiconductor optical amplifier that amplifies light and outputs the amplified light, for each gain value corresponding to an input light intensity, which is an intensity of light, in association with the wavelength; a wavelength acquiring unit that receives input light branched by a branching device that branches the input light, to calculate transmittance and reflectance of the received input light, and acquires a wavelength corresponding to the calculated transmittance and reflectance from the wavelength-specification storage unit; a driving-current-value acquiring unit that calculates a gain value corresponding to the input light intensity, which is an intensity of the input light received from the branching device, and acquires a driving current value corresponding to a calculated gain value and a wavelength acquired by the wavelength acquiring unit from the driving-current storage unit; and an output unit that outputs a driving current value acquired by the driving-current-value acquiring unit to a driving-current control circuit that controls the driving current, which is a current required for driving the semiconductor optical amplifier serially connected to the branching device and an optical delay device that delays and outputs the input light branched by the branching device.