Patent ID: 8550726

Claim:
A single wavelength-bi-directional optical transceiver for transmitting/receiving optical signals having the same wavelength through an optical communication system, comprising: a transmitter including an isolator and converting an external input signal into an optical transmit signal; an optical filter reflecting some of the optical transmit signal and transmitting the remainder of the optical transmit signal; an optical fiber transmitting the optical transmit signal transmitted by the optical filter to a counterpart optical transceiver; a receiver receiving an optical receive signal from the counterpart optical transceiver via the optical fiber; and a body enclosing a portion of the transmitter, the optical filter, a portion of the optical fiber and a portion of the receiver, wherein an incidence angle (θ 2 ) formed between a central axis of the transmitter and a central axis of the optical fiber is adjusted to allow the optical transmit signal to be obliquely incident into the optical fiber in order to reduce reflection of the optical transmit signal by the optical fiber without coupling with the optical fiber when the transmitter transmits the optical transmit signal to the optical fiber; a tilt angle (θ 3 ) of the optical filter is determined to be 46.41° if the angle (θ 1 ) formed between a normal of a section of the optical fiber and the central axis of the optical fiber and the incidence angle (θ 2 ) of the transmitter is 6°, and tilt angle (θ 3 ) of the optical filter is determined to be 45.9° if the angle (θ 1 ) formed between the normal of the section of the optical fiber and the central axis of the optical fiber and the incidence angle (θ 2 ) of the transmitter is 8°, such that an amount of the optical transmit signal, which does not couple with the optical fiber and is back-reflected by the optical filter and incident into the receiver, can be minimized and the optical receive signal can be vertically incident.