Optical circuit for a measuring system for measuring the reflect

Details Optical circuit for a measuring system for measuring the reflect Optical circuit for a measuring system for measuring the reflect

1994-03-30

1995-10-03

McGraw, Vincent P.

Optics: measuring and testing

For optical fiber or waveguide inspection

G01N 2188

Patent

active

054556716

ABSTRACT:
Optical circuit for a measuring system for measuring the reflection sensitivity of an optical transmission network, comprising a first and a second connection point (1, 4) for a first and a second optical signal source (S1, S2), respectively, a third connection point (2) for optical receiving means (R), optical reflection means (RF), and coupling means. The coupling means consist of a first waveguide junction (C2) via which the second connection point (4) is coupled in the forward signal direction to the reflection means, and a second waveguide junction (C1) via which the first connection point (1) is coupled in the forward signal direction to the third connection point. The two junctions are coupled in such a way that the reflection means are coupled in the forward signal direction to the third connection point via the first and second junctions. Advantages: All the effects on which the reflection sensitivity of an optical transmission system depends, can be influenced, as far as possible separately and to a sufficient degree. Signal sources to be connected are not coupled in the forward signal direction.

REFERENCES:
Sales brochure: VB8/VB9 Series, Variable Optical Backreflectors, JDS Fitel, Inc., 570 Hester Drive, Nepean (Ottawa), Ontario, Canada K2G 5W8, Apr., 1991.
M. O. van Deventer, "Bidirectional Optical-Fibre Communication", Monograph 9101, PTT Research, Leidschendam, The Netherlands, 1991.
W. M. Emkey: "A Polarization-Independent Optical Circulator for 1.3 .mu.m", Journal of Lightwave Technology, IEEE, vol. LT-1, No. 3, pp. 466-469, Sep., 1983.
R. Staubli; Crosstalk Penalties Due to Coherent Rayleigh Noise in Bidirectional Optical Communication Systems; Journal of Lightwave Technology; vol. 9, No. 3; Mar. 1991; N.Y., U.S.A.
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