Abstract: The present invention relates generally to a passive optical network (PON)-based video overlay pluggable type optical network device that is easily connected and detached from an indoor optical network terminal (ONT) at a subscriber side, which transmits and receives an optical signal in which a video RF optical signal and a PON optical signal are overlaid, wherein a PON board for receiving and processing the PON optical signals and a video RF board for receiving and processing the video RF optical signals are easily removed for replacement from a housing including an optical sub-assembly (OSA), which separates the PON optical signal and the video RF optical signal, and the PON board and the video RF board are individually designed and configured in a removable manner so that interference between the signals is minimized and selective combinations and production are possible according to various types of PONs and video services.

Abstract: According to the present disclosure, a controlling unit arbitrarily determines a current set temperature of a temperature setting unit to cause a light generating unit connected to the temperature setting unit to generate an optical signal having a wavelength according to the current set temperature, thereby making it possible to effectively reduce a wavelength overlap phenomenon that may occur when a plurality of R-ONUs in a passive optical network simultaneously transmit the optical signals.

Abstract: Provided is an optical transceiver module having a dual band pass WDM coupler embedded therein, wherein the dual band pass WDM coupler provides pass bands for selectively passing a transmission signal output from an optical transmitting unit, and an optical signal having a specific wavelength received by an optical receiving unit among optical signals input through a common port. According to the present invention, a size and cross-talk of the optical transceiver module may be reduced, and the optical transceiver module may be used as a video transceiver in an optical subscriber network according to an ITU-RG.983.3 standard.

Abstract: Disclosed is an optical transceiver capable of controlling self-heating according to temperature, more particularly, an optical transceiver which uses a PTC heater suitable for temperature characteristics to easily control self-heating. A PTC heater of which the self-resistance changes depending on the ambient temperature of uncooled laser diodes of an optical transceiver so as to adjust heating volume of the heater, is applied to a TO CAN, thus making it possible to significantly reduce power consumption while expanding an available temperature range of existing optical modules, even without a separate controller or using a minimum number of control circuits.