| 摘要 |
An optical diplexer (25,27,29) is disclosed which significantly reduces the losses associated with conventional 3dB couplers. Basically, the diplexer comprises a standard in-line isolator (a pair of birefringent plates (27,29) separated by a Faraday rotator, (25)) which is modified to include a second, preferably polarization-specific, source such as a laser (55) at the output. The second source is positioned such that its output will pass through the isolator and re-enter the input fiber (45). For example, the second source (55) is located below the output fiber and angled upward to provide coupling into the device. A third source (53), e.g. of pumping radiation for an erbium-doped input fiber (45), may be included, positioned above the output fiber and tilted downward towards the device. <IMAGE> |
