Bi-directional light port for injecting light into and tapping light from a side of an optical fiber

• US 5,673,344 A
• Filed: 06/20/1996
• Issued: 09/30/1997
• Est. Priority Date: 06/20/1996
• Status: Expired due to Term

• Current Assignee: NEC Corporation
• Original Assignee: NEC Research Institute, Inc. (NEC Corporation)
• Inventors: Wang, Ting, Li, Yao
• Primary Examiner(s): Palmer, Phan T. H.
• Application Number:
  US08/667,164
• Time in Patent Office: 467 Days
• Field of Search: 385/48, 385/47, 385/44, 385/43, 385/42, 385/41, 385/45, 385/46, 385/31
• US Class Current: 385/48
• CPC Class Codes: G02B 6/2817 using reflective elements to split or combine optical signals
• CPC Class Codes: G02B 6/2852 using tapping light guides arranged sidewardly, e.g. in a non-parallel relationship with respect to the bus light guides (light extraction or launching through cladding, with or without surface discontinuities, bent structures)

Abstract

A method and apparatus for tapping and distributing light propagating through a polymer optical fiber (POF). Within the polymer optical fiber, one or more mirrors are constructed. At a point in the POF where an internal mirror is constructed, light traversing the POF is efficiently diverted out of the polymer optical fiber upon striking the mirror. As such, the light which is diverted is effectively tapped off and may be put to an advantageous use.

Claims

1. A bi-directional light port, for tapping light from and injecting light into an optical fiber comprising:

one or more mirrors, positioned within the optical fiber such that a desirable portion of light traversing the fiber is deflected out a side of the optical fiber and light striking the side of the fiber adjacent to the mirror is injected into the fiber and reflected by the mirror such that the injected light traverses the fiber and wherein said mirrors are constructed by cutting the fiber and removing a portion of the optical fiber so that a mirror region is created and said mirror region is subsequently refilled with a suitable material.

2. The bi-directional light port according to claim 1 wherein said mirrors further comprise:

a coating, applied to the mirrors wherein said coating is a reflective material that enhances the reflectivity of the mirrors.

3. The bi-directional light port according to claim 2, wherein said mirrors are cut with a sharp instrument.

4. The bi-directional light port according to claim 3 wherein said sharp instrument is heated prior to cutting.

5. The bi-directional light port according to claim 1 further comprising:

one or more opposing mirrors, positioned within the optical fiber such that said injected light strikes both the mirrors and opposing mirrors and traverses the fiber bi-directionally.

6. The bi-directional light port according to claim 1 wherein said optical fiber is coupled to a light source and a power meter such that light power my be monitored during the cutting and refilling of the optical fiber.

7. The bi-directional light port according to claim 1 wherein said deflected light is deflected out of a desirable portion of the circumference of the fiber from 0 to 360 degrees.

8. The bi-directional light port according to claim 1 wherein said injected light is injected into a desirable portion of the circumference of the fiber from 0 to 360 degrees.