Importance

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Abstract

Disclosed herein is a bi-directional optical sub-assembly structured to reduce reflection noise. The bi-directional optical sub-assembly includes an optical fiber; a transmitter transmitting an optical transmit signal having passed through a 45° filter to the outside through the optical fiber, a receiver receiving an optical receive signal which is received from the outside through the optical fiber, is reflected by the 45° filter and passes through a 0° filter; a body encompassing a part of the optical fiber, a part of the transmitter and a part of the receiver; a cap housing encompassing a part of the transmitter and including an opening to provide a passage for the optical transmit signal from the transmitter to the optical fiber, and a filter holder having the 45° filter and the 0° filter attached thereon within the body. The opening of the cap housing is set to have a minimum diameter X_min and a maximum diameter X_max so as to transmit the optical transmit signal without loss and to prevent the optical transmit signal from entering back to the transmitter after the optical transmit signal is reflected by the optical fiber, and the filter holder includes a first passage connected to the 45° filter and a second passage connected to the 0° filter. The first passage is set to have a predetermined filter holder size d_h so as to prevent the optical transmit signal from entering the receiver after the optical transmit signal is reflected by the optical fiber.

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First Claim