Patent ID: 9106361
Filing Date: 2015-08-11
Classification: H04B,H04J

Abstract:
1. A passive wavelength division multiplexing device for automatic wavelength locking, comprising: an optical multiplexer configured to allow a light having a corresponding wavelength to be outputted to one or more optical network units (ONUs) when a predetermined wavelength of a light beam inputted thereto is synchronized to a passband thereof; a splitter configured to split a part of the light outputted from the optical multiplexer into a plurality of light beams; an optical filter configured to allow the light beams splitted by the splitter to pass therethrough; an integrated optical receiver monitor configured to detect the intensity of the light beams that has passed through the optical filter and convert the detected light beams into electrical signals; a wavelength-tunable optical transmitter configured to allow a light beam having a specific wavelength to be inputted to the optical multiplexer while scanning the plurality of light beams having different wavelengths according to a temperature, and adjust a wavelength of an optical signal to be outputted to the optical network units (ONUs) through the optical multiplexer, into a wavelength of an optical signal having the maximum optical intensity to lock the wavelength using optical intensity information corresponding to the electrical signals converted by the integrated optical receiver monitor; an FSK Tx section configured to transmit its locked wavelength information using a frequency shift keying (FSK) signal or a subcarrier which is carried on the amplitude of payload data within a given percentage; a first photo detection section configured to detect the intensity of a light having a specific wavelength transferred thereto from the optical network unit (ONU) through monitoring; and a first polymer optical sub-assembly section configured to transmit the light having the specific wavelength detected by the first photo detection section using a polymer optical sub-assembly.