| 摘要 |
A telecommunication system having a main unit having a light transmitting device and means for modulating information on to the transmitted light at a first frequency, an optical link coupling the main unit to at least one subscriber unit, the subscriber unit including a quantum well reflective modulator (QWRM) for demodulating the input light signal in order to retrieve the transmitted information, and for reflecting at least a portion of the light received at the subscriber unit and at the same time modulating information on to the reflected light at a second frequency. <IMAGE>
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