Apparatus and methods for testing optical communications networks

• US 5,210,703 A
• Filed: 10/24/1990
• Issued: 05/11/1993
• Est. Priority Date: 10/24/1989
• Status: Expired due to Fees

• Current Assignee: British Aerospace, Inc.
• Original Assignee: British Aerospace, Inc.
• Inventors: Hodgson, Derek G.
• Primary Examiner(s): Lall, Parshotam S.
• Assistant Examiner(s): Ramirez, Ellis B.
• Application Number:
  US07/602,145
• Time in Patent Office: 930 Days
• Field of Search: 364/525, 364/551.01, 359/110, 359/173, 359/177, 359/178, 356/73.1, 371/25.1
• US Class Current: 398/33
• CPC Class Codes: G01M 11/31 with a light emitter and a light receiver being disposed at the same side of a fibre or waveguide end-face, e.g. reflectometers
• CPC Class Codes: G01M 11/33 with a light emitter being disposed at one fibre or waveguide end-face, and a light receiver at the other end-face

Abstract

A handheld test set including a microprocessor-controlled optical transmitter (17) and receiver (18) for testing optical networks such as star couplers. Light intensity reflected from a star coupler under test is compared with a stored value in order to indicate a pass or fail status. Test results are stored in a memory (21) for subsequent downloading into a database.

Claims

1. An optical communications network test equipment for testing parameters of light transmitted and received via a plurality of fibre optic cabled light paths, said test equipment including:

an optical transmitter means for transmitting light with parameters determined by test stimulus data;

an optical receiver means for receiving light in response to actions of said transmitter means and for producing actual response data;

an optical coupler means for coupling light between said transmitter means and said receiver means and said cabled light paths;

programmable data storage means for storing said test stimulus data, and expected and actual response data for each of said light paths, said storage means having an output connected to said transmitter means, and an input connected to said receiver means; and

comparator means, connected to said storage means, for comparing said actual response data with said expected response data.

2. An optical communications network test equipment for testing parameters of light transmitted and received via a plurality of fibre optic cabled light paths, said test equipment including a hand-held fibre optic test set, said test set comprising:

programmable data storage means for storing a plurality of test signals and for storing a plurality of receiver sensitivities;

first means for retrieving at least one stored test signal;

second means for retrieving at least one stored receiver sensitivity;

an optical transmitter means, responsive to said at least one stored test signal retrieved by said first retrieving means, for transmitting light along at least one of said plurality of fibre optic cabled light paths;

an optical receiver means, responsive to said at least one stored receiver sensitivity retrieved by said second retrieving means, for receiving light in response to light transmissions by said optical transmitter means on at least one of said plurality of fibre optic cabled light paths and for producing actual response data in response thereto;

optical coupler means, responsive to said transmitter means, said receiver means and at least one of said cabled light paths, for coupling light transmitted by said transmitter means into said at least one of said cabled light paths, and for coupling light received along at least one of said cabled light paths into said receiver means; and

comparator means responsive to said receiver means and to said programmable data storage means, for comparing actual response data with expected response data and providing an output indicative of said comparison.

3. The test set according to claim 2, further including printer means for printing, in response to said comparator means, information related to said comparison.

4. The test set according to claim 2, wherein said printer means comprises a cable sleeve printer.

5. The test set according to claim 2, wherein in said optical coupler means light transmitted by said transmitter means and light received by said receiver means is coupled into and out of only one of said at least one cabled light paths.

6. The test set according to claim 2, wherein in said optical coupler means light transmitted by said transmitter means and light received by said receiver means is coupled into and out of separate ones of said at least one cabled light paths.

7. An optical communications network test equipment for testing parameters of light transmitted and received via a plurality of fibre optic cabled light paths, said test equipment including a base station and at least one hand-held fibre optic test set, said test set comprising:

programmable data storage means for storing a plurality of test signals and for storing a plurality of receiver sensitivities;

first means for retrieving at least one stored test signal;

second means for retrieving at least one stored receiver sensitivity;

an optical transmitter means, responsive to said at least one stored test signal retrieved by said first retrieving means, for transmitting light along at least one of said plurality of fibre optic cabled light paths;

an optical receiver means, responsive to said at least one stored receiver sensitivity retrieved by said second retrieving means, for receiving light in response to light transmissions by said optical transmitter means on at least one of said plurality of fibre optic cabled light paths and for producing actual response data in response thereto;

optical coupler means, responsive to said transmitter means, said receiver means and at least one of said cabled light paths, for coupling light transmitted by said transmitter means into said at least one of said cabled light paths, and for coupling light received along at least one of said cabled light paths into said receiver means; and

comparator means responsive to said receiver means and to said programmable data storage means, for comparing actual response data with expected response data and providing an output indicative of said comparison; and

said base station comprising;

base station memory means;

means for communicating with the data storage means of said hand-held test set and for storing test signals and receiver sensitivities therein and, responsive to said data storage means, for reading actual response data stored therein;

an optical receiver means responsive to said test set optical transmitter means for providing calibration information to a base station memory means; and

an optical transmitter for providing a test signal to said test set optical receiver means and for causing said hand set receiver means to generate a received calibration signal which is provided to that base station memory means, responsive to said base station memory for adjusting the calibration of said hand set transmitter means and said hand set receiver means.