Optical receiver and optical module with multiple wavelength tunable filters

An optical receiver with multiple wavelength tunable filters, the receiver comprising:

• a thermoelectric element disposed on a substrate and having a changeable temperature;
• a first wavelength tunable filter having one end disposed on one side of the thermoelectric element and the other end inclined by being disposed lower than a plane of the thermoelectric element, and configured to transmit only a first wavelength of a received signal that is changed based on the temperature of the thermoelectric element;
• a second wavelength tunable filter including a heater disposed at one side, disposed on the one side of the thermoelectric element while being disposed above the first wavelength tunable filter, and configured to transmit only a second wavelength of the received signal that is changed based on temperatures of the thermoelectric element and the heater;
• a first detector disposed on the substrate while being spaced apart from the thermoelectric element, disposed on an optical axis of the received signal, and configured to detect a signal corresponding to one channel transmitted through the first wavelength tunable filter among multiple-channel signals being transmitted through the second wavelength tunable filter, the multiple-channel signals being transmitted therethrough among N reception-channel signals being received;
• a second detector disposed above the substrate while being spaced apart from the first detector, and configured to detect the signal transmitted through the second wavelength tunable filter and then reflected from the first wavelength tunable filter;
• and
• a control unit configured to determine which of the first wavelength tunable filter and the second wavelength tunable filter the signal is transmitted through, based on the signals detected by the first detector and the second detector.