Measurement of attenuation of an optical fiber using bidirection

Details Measurement of attenuation of an optical fiber using bidirection Measurement of attenuation of an optical fiber using bidirection

1994-04-18

1995-10-03

McGraw, Vincent P.

Optics: measuring and testing

For optical fiber or waveguide inspection

G01N 2159

Patent

active

054556724

ABSTRACT:
Attenuation of an optical fiber is measured by transmitting an optical signal having a predetermined wavelength to the fiber, and FSK modulating the optical signal with information identifying the wavelength and transmitted power of the optical signal. At a receiver, the optical signal is detected and the information is recovered by demodulation. Wavelength-dependent sensitivity information for the detector is read from a store in dependence upon the wavelength information and used to control the gain of an amplifier for amplifying a subsequently transmitted continuous wave optical signal used for attenuation measurement. The received power level of this optical signal is converted into a digital value and used with the transmitted power information to determine the fiber attenuation at the predetermined wavelength. Reference power levels are determined by connecting a jumper between a port and an external detector. Measurement of attenuation and communication data over the fiber under test may be effected using two transceiver units, one at each end of the fiber. In addition to the external detector, each unit has an internal detector and sources connected to a port which is connected to the fiber under test by a jumper. Determination of the attenuation of the fiber then takes account of the loss of each fiber using reference power levels determined by initial calibration measurements.

REFERENCES:
patent: 4234253 (1980-11-01), Higginbotham et al.
patent: 4673291 (1987-06-01), Heckmann
patent: 4726676 (1988-02-01), Maslaney et al.
patent: 4737026 (1988-04-01), Dalgoutte et al.
patent: 4737027 (1988-04-01), Maeda
patent: 4799790 (1989-01-01), Tsukamoto et al.
patent: 4901003 (1990-02-01), Clegg

Affiliated with

Also associated with

Rating

Measurement of attenuation of an optical fiber using bidirection does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Measurement of attenuation of an optical fiber using bidirection, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Measurement of attenuation of an optical fiber using bidirection will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1080916