Patent ID: 8249465
Filing Date: 2012-08-21
Classification: G02F,H01S,H04B

Abstract:
1. A light transmitting apparatus comprising; a light transmitter having a light source and an electro-absorption optical modulator that modulates light output from the light source, and a controller that controls the light transmitter so that an optical output power from the light transmitter becomes constant, based on a monitor value of photoelectric current generated due to light absorption by the electro-absorption optical modulator, and the photoelectric current is outputted directly from the electro-absorption optical modulator, wherein the controller is configured to use a reference value of the photoelectric current corresponding to a wavelength of the light source, from amongst reference values of the photoelectric current that are different for each wavelength and are set depending on the wavelength dependency of the photoelectric current of the electro-absorption optical modulator, to control the light transmitter depending on a difference between the reference value and the monitor value.