| 摘要 |
<p>An optical heterodyne detection device is described in which with the aid of three controllable elements (A, B and C), to influence the state of polarisation and having a limited control range, such as Faraday rotators or birefringent electro-optical crystals, the state of polarisation of radiation originating from a local oscillator (30) is made to correspond to the signal beam transmitted through a long-distance transmission fibre (10).</p> |
