随着光纤技术的飞速发展和应用,光纤无源器件顺应当前形势也获得很大的发展空间,其中光纤熔锥器件具有制作简单、性能可靠、价格便宜及技术指标优越等优点,从而广受青睐。在熔锥器件中,光纤耦合器是广为应用的基础元器件。目前为实现全光通信,光纤超平坦宽带耦合器则成为热点课题。利用特殊相位补偿工艺方法,研制出单模光纤超平坦宽带耦合器,其工作波长范围为1250～1650 nm,3 dB带内最大插损偏差小于等于0.4 dB,带内最大附加损耗小于等于0.1 dB,方向性(输入侧非注人光的一端的输出光功率与注人光功率的比值)大于等于66.5 dB,偏振相关性小于等于0.1 dB。研制方法有很高的成品率,可批量生产。

Fiber-optic passive devices are so suitable for current situation that they have greatly been grown with rapid developments and broad applications of optical fiber technology, within which optical fiber fused tapering devices are more noticeable due to their simple manufacture, stable performance, cheaper price and super specification. Among the above ones, optical fiber couples are widely used as fundamental devices. Recently, super-flat-wideband single-mode optical fiber couplers become a popular research area with urgent development of all-fiber communications. Super-flat-wideband single-mode optical fiber couplers have been developed by the architectural method of special phase compensation, whose operating wavelength band is from 1250 nm to 1650 nm, 3 dB-insertion-loss maximum deviation within the band is less than 0.4 dB, maximum excess loss within the band is less than 0.1 dB, directionality is greater than 66.5 dB, and polarized dependent loss is less than 0.1 dB. In the light of the method high rate of the finished products, meanwhile, a batch productions are feasible.