Methods for determining optical fiber joint loss and joint eleme

Details Methods for determining optical fiber joint loss and joint eleme Methods for determining optical fiber joint loss and joint eleme

1993-04-01

1993-11-02

Ullah, Akm E.

Optical waveguides

With optical coupler

Particular coupling function

385 69, 385 95, G02B 600, G02B 636

Patent

active

052590470

ABSTRACT:
Optical fiber joint loss is determined by launching an optical signal in an upstream fiber and measuring the launched signal at an end of the upstream fiber which is to be joined to a downstream fiber, joining the upstream fiber to the downstream fiber and disposing the joint in a transparent medium, the transparent medium having a refractive index substantially equal to or greater than a refractive index of a cladding of the downstream fiber, measuring a fixed proportion of optical power coupled at a predetermined angle with respect to a longitudinal axis of the downstream fiber immediately adjacent the joint, and estimating the optical fiber joint loss as L=1-k(P.sub.o /P.sub.i), where L is the estimated joint loss, P.sub.i is the optical power measured before making the joint, P.sub.o is the optical power measured after making the joint, and k is an empirically determined proportionality constant. The joint may be disposed in the transparent medium by location in a suitable joint element having at least one coupling formation for coupling out of the element light propagating in the element at the predetermined angle. The method and associated joint elements are particularly suitable for measuring joint losses under 0.5 dB.

REFERENCES:
patent: 4254865 (1981-03-01), Pacey et al.
patent: 4562632 (1986-01-01), Parchet et al.
patent: 4652123 (1987-03-01), Neumann
patent: 4662962 (1987-05-01), Malavieille
patent: 4730892 (1988-03-01), Anderson
patent: 4850671 (1989-07-01), Finzel
patent: 5029972 (1991-07-01), Lukas et al.
patent: 5133033 (1992-07-01), Lukas et al.

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