Adjustable optical power limiter

Details Adjustable optical power limiter Adjustable optical power limiter

1997-01-28

1998-11-17

Palmer, Phan T. H.

Optical waveguides

With optical coupler

Input/output coupler

385 16, 385 23, 385 33, G02B 632

Patent

active

058388524

ABSTRACT:
An adjustable optical power limiter wherein an output optical fiber having a one-quarter pitch of Grade Index Refractive (GRIN) lens is rotated about its axis to produce incremental and varying insertion losses. An input optical fiber having a GRIN lens is optically aligned with the output fiber so that a minimum amount of insertion loss is produced in the output fiber when the output fiber is in a nominal or zero rotational position. A controller in conjunction with a step motor can incrementally rotate the output fiber from the nominal position to optically misalign the input fiber from the output fiber. In this manner, the adjustable optical power limiter can incrementally produce insertion losses in the output fiber, thereby limiting the optical output power.

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