Method of making a short-pass fiber with controlled cut-off...

Details Method of making a short-pass fiber with controlled cut-off... Method of making a short-pass fiber with controlled cut-off...

2006-02-07

2006-02-07

Hellner, Mark (Department: 3663)

Optical: systems and elements

Optical amplifier

Optical fiber

C385S127000, C065S385000

Reexamination Certificate

active

06995900

ABSTRACT:
A method of producing a short-pass fiber by drawing a preform for a depressed cladding fiber at a predetermined drawing ratio. The preform has a core of refractive index n0, a depressed cladding surrounding the core and having a refractive index n1, and a secondary cladding surrounding the depressed cladding and having a refractive index n2. The core has a core cross-section and the depressed cladding has a depressed cladding cross-section that is larger than the core cross-section. The drawing ratio is determined based on the parameters of the preform measured along the axis of the preform and based on a desired minimum fundamental mode cutoff wavelength λm. The final core cross-section defines a fundamental mode cutoff wavelength λcsuch that λc≧λmalong the axis. Then the preform is pulled by the thus-determined drawing ratio to produce the short-pass fiber. In some embodiments a test section of the fiber is pulled first before pulling the short pass fiber.

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