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一、前言在短距离的光通信系统中,发光管是较理想的光源之一。它与激光器相比,具有寿命长、性能稳定、可靠、成本低等优点。但是,发光管是一种非相干光源,方向性较差,发散角大达120°(半功率点计),而纤维接收角又小(例如,数值孔径为0.2的光纤,功率降到10%时接收角仅为120°),致使发光管与光纤的光耦合效率非常低。因此,要解决发光管在光通信中的应用问题,提高它与光纤之间的耦合效率就成了很关键的问题之一。
I. Introduction In the short-distance optical communication system, the LED is one of the more ideal light sources. Compared with the laser, it has the advantages of long life, stable performance, reliability and low cost. However, LED is a non-coherent light source with poor directivity, divergence angle up to 120 ° (half-power point meter) and small fiber acceptance angle (for example, fiber with numerical aperture of 0.2, power down to 10% When the receiving angle is only 120 °), resulting in light-emitting tube and fiber optical coupling efficiency is very low. Therefore, to solve the problem of LED application in optical communication, it is one of the key issues to improve the coupling efficiency between it and optical fiber.