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根据“ｌｉｇｈｔｗａｖｅ”１９９９ＷｏｒｄｗｉｄｅＤｒｅｃｔｏｒｙｏｆＦｉｂｅｒ－ＯｐｔｉｃＣｏｍｍｕｎｉｃａｔｉｏｎｓＰｒｏｄｕｃｔｓａｎｄＳｅｒｖｉｃｅｓ第１６４－１７５页资料统计，目前国外生产销售光放大器的厂家（公司）共有２８个；推出有光放大器产品
According to statistics of “lightwave” 1999 Wide Catalog of Fiber-Optic Communications Products and Services, pp. 164-175, there are currently 28 manufacturers (companies) that produce and sell optical amplifiers in the world. There are 28 optical amplifiers