Optical fiber bundle utilizing electromagnetic radiation feedback

• US 7,196,783 B2
• Filed: 11/17/2003
• Issued: 03/27/2007
• Est. Priority Date: 11/15/2002
• Status: Active Grant

• Current Assignee: Accurate Machining Incorporated
• Original Assignee: Accurate Machining Incorporated
• Inventors: Drake, Ronald E. Jr., Drake, Ronald E. Sr., Drake, Matthew R.
• Primary Examiner(s): Nguyen; Tu T.
• Application Number:
  US10/714,797
• Publication Number:
  US 20040135994A1
• Time in Patent Office: 1,226 Days
• Field of Search: 356/73.1, 385/49, 385/12, 385/43, 250/227.14, 250/227.18
• US Class Current: 356/73.1
• CPC Class Codes: G01M 11/30 Testing of optical devices, constituted by fibre optics or optical waveguides

Abstract

A system for adjusting the light (EMR) input into optical fibers comprising a set of “parasitic” optical fibers randomly distributed among a bundle of transmitting fibers. The parasitic fibers are joined by a separate ferrule from the transmitting fibers and are not connected to an EMR source. As a result, the parasitic fibers pick up and transmit light that is lost from the transmitting fibers for detection by a sensor that determines the amount of light being output from these parasitic fibers and, therefore, the amount of right transmitted by the fiber bundle that is subject to variation, such as variation in the intensity of the light source. The level of light output by the parasitic fibers to the detector determines whether the light (EMR) source needs to be adjusted to maintain a steady output from the transmitting fibers.

Claims

1. A system for determining the amount of light (EMR) output from an optical fiber bundle including at least one optical fiber interconnected to a light (EMR) source, said system comprising:

at least one parasitic fiber positioned adjacent to said at least one optical fiber for receiving and transmitting light (EMR) received from said at least one optical fiber; and

a detector coupled to said at least one parasitic fiber for measuring the amount of Light (EMR) transmitted thereby, wherein said detector is coupled to said light (EMR) source and includes circuitry for adjusting the intensity of said light (EMR) source in response to the intensity of light detected in said parasitic fiber.

2. The system of claim 1, wherein said fiber bundle includes a plurality of optical fibers joined by a ferrule.

3. The system of claim 1, wherein said optical fiber and said parasitic fiber have the same index of refraction.

4. The system of claim 1, wherein said optical fiber has a first index of refraction and said parasitic fiber has a second index of refraction.

5. The system of claim 1, wherein said detector is positioned adjacent to said light (EMR) source.

6. The system of claim 1, wherein said detector is positioned at an end of said optical fiber bundle opposite from said light (EMR) source.

7. The system of claim 1, further comprising a plurality of parasitic fibers distributed throughout said optical fiber bundle.

8. A method of maintaining the output level of a fiber optic bundle including at least one optical fiber interconnected to a light (EMR) source, said method comprising the steps of:

positioning at least one parasitic fiber adjacent to said at least one optical fiber;

detecting the intensity of light (EMR) transmitted by said parasitic fiber; and

adjusting the intensity of said light (EMR) source to maintain the output level of said fiber optical bundle based on the intensity of light (EMR) transmitted by said parasitic fiber.

9. The method of claim 8, wherein said step of adjusting the intensity of said light (EMR) source to maintain the output level of said fiber optical bundle comprises the steps of:

inputting the intensity of light (EMR) transmitted by said parasitic fiber into a feedback circuit; and

proportionally adjusting the intensity of said light (EMR) source based on a comparison of the intensity of light (EMR) transmitted by said parasitic fiber and the intensity of light (EMR) transmitted by said optical fiber bundle.