| 摘要 |
<p>An optical transmitter/receiver which can easily discriminate the re-attaching (connection) of an optical fiber without adversely affecting human eyes even when the optical fiber is disconnected from the optical transmitter/receiver body. A failure (O) to transmit an optical signal from the associated optical transmitter/receiver due to disconnected optical fiber is discriminated to change over a switch (8) and send a second reference voltage (10) to an automatic light output control mechanism (7), whereby power of a laser diode (5) is reduced. At the same time, a switch (3) allows the output of a low-frequency first dummy signal (S1) instead of a normal signal, and the associated optical transmitter/receiver also outputs the dummy signal (S1). When an optical fiber on one side is attached, the first dummy signal (S1) is detected and the optical transmitter/receiver sends a low-output second dummy signal (S2). When the optical fiber on the other side is correctly attached, the second dummy signal (S2) is detected at the associated optical transmitter/receiver to switch the transmission signal on the associated side to a normal signal (N) and change a laser diode output to a normal size.</p> |
