| 摘要 |
At least one of the waveguides comprises an exciting port (1a). The optical coupling is continuously or stagewise variable and is produced through a rectifier coupler (5) with regulatable effect over-coupling degree. The rectifier coupler consists where the wave conductors (1, 2, 3, 4), are turned in relation to one another. It can also comprise a so-called smelt coupler. The waveguides are coupled together via ideal joints (7) produced e.g. with the aid of fibre welding. When a fibre is excited with an effect Po the back-reflecting effect in the exciting port (1a) amounts to Pr=2k(1-k)Po corresp. to a reflection of Pr/Po=2k(1-k). |
