Fiber inspection microscope and power measurement system, fiber inspection tip and method using same

Patent metadata

Field	Value
Publication number	US-9915790-B2
Application number	US-201514962301-A
Country	US
Kind code	B2
Filing date	Dec 8, 2015
Priority date	Dec 15, 2014
Publication date	Mar 13, 2018
Grant date	Mar 13, 2018

Abstract

The fiber inspection microscope and power measurement system for inspecting an endface of an optical fiber at an angle-polished connector generally has: a mating interface for receiving the angle-polished connector, the endface causing a mean propagation direction of light exiting the optical fiber at endface to be tilted relative to an imaging path of the system; a converging element to be optically coupled to the endface and being configured to receive the tilted light and to redirect the tilted light toward the imaging path of the fiber inspection microscope system; and a power detection assembly optically coupled to the converging element, the power detection assembly being configured to detect an optical power associated with the tilted light redirected by the converging element.

First claim

What is claimed is:

1. A fiber inspection microscope and power measurement system for inspecting an endface of an optical fiber at an angle-polished connector, the endface of the optical fiber being polished at a non-perpendicular angle relative to a propagation axis of the optical fiber, the fiber inspection microscope and power measurement system comprising:
a housing structure;
a mating interface mounted to the housing structure and configured to receive the angle-polished connector in an inspection position for inspection of the endface, the endface causing a mean propagation direction of light exiting therefrom to be tilted relative to an imaging path of the fiber inspection microscope and power measurement system;
a converging element enclosed in the housing structure, a diameter of the converging element and a distance between the converging element and the mating interface being adapted to receive the tilted light from the endface of the optical fiber, the converging element redirecting the tilted light toward the imaging path of the fiber inspection microscope and power measurement system when the angle-polished connector is in the inspection position; and
a power detection assembly enclosed in the housing structure and optically coupled to the converging element to detect an optical power value associated with the tilted light redirected by the converging element during use.

2. The fiber inspection microscope and power measurement system of claim 1 , wherein the converging element is a converging lens system.

3. The fiber inspection microscope and power measurement system of claim 1 , wherein a value of a distance between the converging element and the mating interface along the imaging path is between 5 mm and 8 mm.

4. The fiber inspection microscope and power measurement system of claim 1 , wherein the fiber inspection microscope and power measurement system comprises a fiber inspection tip having a tip housing and comprising the mating interface and the converging element enclosed in the tip housing; and wherein the housing structure comprises the tip housing and a probe housing enclosing the power detection assembly and an optical-fiber endface imaging assembly.

5. The fiber inspection microscope and power measurement system of claim 4 , wherein the imaging assembly is optically coupled to the converging element, the imaging assembly being configured to illuminate the endface of the optical fiber and to image the illuminated endface for inspection thereof, the converging element being configured to redirect the tilted light into an objective lens of the imaging assembly located in the probe housing.

6. The fiber inspection microscope and power measurement system of claim 4 , wherein the tip housing has a ferrule receiving channel for receiving the angle-polished connector, the ferrule receiving channel being tilted relative to the imaging path such that the endface of the optical fiber is positioned perpendicularly to the imaging path of the fiber inspection microscope and power measurement system.

7. The fiber inspection microscope and power measurement system of claim 4 , wherein a numerical aperture of the imaging assembly is greater than 0.31.

8. The fiber inspection microscope and power measurement system of claim 4 , wherein the tip housing is releasably connectable to the probe housing.

9. The fiber inspection microscope and power measurement system of claim 8 , wherein the fiber inspection tip is interchangeable with fiber inspection tips having no converging element.

10. The fiber inspection microscope and power measurement system of claim 9 , wherein the converging element causes an image of the endface on an image sensor of the imaging assembly to be magnified compared to the fiber inspection tips having no converging element, to obtain a resolution below 0.2 μm per pixel.

11. A fiber inspection tip for use with a fiber inspection microscope and power measurement probe having a power detection assembly and an optical-fiber endface imaging assembly enclosed therein, the fiber inspection tip comprising:
a tip housing having a longitudinal axis, a probe end having a probe interface configured to mate with the fiber inspection microscope and power measurement probe, an inspection end having a mating interface configured to receive an endface of an optical fiber at an angle-polished connector, and an inner cavity extending along the longitudinal axis between the probe end and the inspection end, the endface of the optical fiber forming a non-perpendicular angle relative to a propagation axis of the optical fiber and causing a mean propagation direction of light exiting the optical fiber at the endface to be tilted relative to an imaging path of the fiber inspection microscope and power measurement probe; and
a converging element disposed in the inner cavity of the tip housing, a diameter of the converging element and a distance between the converging element and the mating interface being adapted to receive the tilted light, the converging element redirecting the tilted light toward the imaging path of the fiber inspection microscope and power measurement probe when the fiber inspection tip is mounted to the fiber inspection microscope and power measurement probe and the angle-polished connector is received in the mating interface of the fiber inspection tip.

12. The fiber inspection tip of claim 11 , wherein the inner cavity is open at the probe end for receiving the converging element.

13. The fiber inspection tip of claim 11 , wherein the tip housing has a ferrule receiving channel for receiving the angle-polished connector, the ferrule receiving channel being tilted relative to the imaging path such that the endface of the optical fiber is positioned perpendicularly to the imaging path of the fiber inspection microscope and power measurement probe.

14. The fiber inspection tip of claim 11 , wherein the converging element has a lens diameter being greater than 2 mm.

15. The fiber inspection tip of claim 11 , wherein a value of a distance between the converging element and the mating interface along the imaging path is between 5 mm and 8 mm.

16. The fiber inspection tip of claim 11 , wherein the converging element is a converging lens system.

17. The fiber inspection tip of claim 11 , wherein the fiber inspection tip is releasably connectable to the fiber inspection microscope and power measurement probe.

18. The fiber inspection tip of claim 17 , wherein the fiber inspection tip is interchangeable with fiber inspection tips having no converging element.

Assignees

• Exfo Inc

Inventors

• Baribault Robert

Classifications

• G02B6/381

  of the ferrule type, e.g. fibre ends embedded in ferrules, connecting a pair of fibres · CPC title

• G02B6/423

  using guiding surfaces for the alignment · CPC title

• G01N2021/9511

  Optical elements other than lenses, e.g. mirrors · CPC title

• G01M11/30

  Testing of optical devices, constituted by fibre optics or optical waveguides · CPC title

• G02B6/32

  having lens focusing means {positioned between opposed fibre ends (with lens being an integral part of the single fibre end G02B6/262)} · CPC title