| 摘要 |
The present invention provides a method and system for modal noise suppression in a fiber optics systems.A single mode optical fiber (21) comprises a strongly absorbing outer cladding glass and a non-absorbing inner cladding glass (12). The fiber also includes a non-absorbing core glass (13). Through this combination modal noise is suppressed. In an another aspect, an in-line attenuator is provided. The in-line attenutator includes a single mode optical fiber, an attenuating fiber (22) coupled thereto, and a ferrule member for bolding the single mode optical fiber and the attenuating fiber. In a third aspect, an isolator is provided. The isolator comprises an optics assembly and an input transmission fiber coupled to the optics assembly. The isolator further includes a first modal noise suppression (MNS) fiber coupled in the input transmission fiber and a gradient index lens (34) coupled between the optics assembly and the MNS fiber. The isolator further includes a second MNS fiber coupled to the gradient index lens (34) and an output filter (36) coupled to the second MNS fiber. In another aspect, a fiber amplifier is provided. The fiber amplifier comprising first and second wavelength division multiplexers (WDMS) (41) means and first and second fibers which provide pump power into the first and second WDM means.
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