Patent ID: 7520682

Claim:
An apparatus comprising: a transceiver module, the transceiver module including: a laser diode for generating an optical signal to transmit; a first photodiode for controlling the laser diode; a second photodiode for receiving an optical signal of a first wavelength among input optical signals; a third photodiode for receiving an optical signal of a second wavelength different from the first wavelength among the input optical signals; a first filter for transmitting an optical signal of a first wavelength band to which the first wavelength belongs to the second photodiode; and a second filter for transmitting an optical signal of a second wavelength band to which the second wavelength belongs to the third photodiode; and an optical collimator, coupled at a light input and output end at an opening at one end of the transceiver module, on which a lens having a same diameter as an optical fiber is coupled in a direction light proceeds to prevent optical crosstalk between adjacent optical signals, wherein the optical collimator is passively aligned with the optical fiber, and each surface of the first and second filters is formed in a rectangular, parallelpiped shape to maintain a ninety degree angle therebetween.