| 摘要 |
An optical transceiver (1) for transmitting and receiving optical signals of the same wavelength comprising a light source, such as a laser diode (2) or a reflector (11), a light receiver such as a photodiode (3), and an input-output (4) for receiving light from and transmitting light to a bi-directional optical fibre (5). An optical switch (6), e.g. a Mach-Zehnder interferometer comprising one or more p-i-n diode phase modulators (9, 10), is provided to selectively provide optical communication between the light source (2, 11) the optical fibre (5) and between the optical fibre (5) and the light receiver (3) to provide low-loss paths therebetween. With a reflector (11) acting as the light source, the optical switch (6) can also be used to modulate the output of the transceiver. The optical transceiver (1) may be used in a home transceiver unit (24) connected to receive digital signals of a first wavelength and analog signals, e.g. for CATV, of a second wavelength from a central unit (31).
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