Optical divider for multimode optical fiber systems

Details Optical divider for multimode optical fiber systems Optical divider for multimode optical fiber systems

1990-10-22

1991-10-22

Lee, John D.

Optical waveguides

With optical coupler

Particular coupling structure

385 46, 385 48, 385130, G02B 626

Patent

active

050589784

ABSTRACT:
A main optical waveguide portion and/or branching optical waveguide portions of the optical waveguide is tapered in such a way so as to expand towards the output side for reducing a coupling loss due to mismatching of numerical apertures N.A. between optical fibers and the optical waveguide, wherein the light entering the optical waveguide at an angle determined by the numerical aperture N.A. of the optical fiber gradually reduces its angle of incidence to an interface of the core and cladding as it passes by a portion where the taper is provided and when the light reaches the output side of the optical fiber, the numerical aperture N.A. thereof is effectively reduced to a value which is lower than the numerical aperture N.A. determined by a difference of refractive-indices in the optical waveguide. By making the numerical aperture N.A. of the optical waveguide a little greater than that of the optical fiber, it is possible to reduce the loss at the input side as well as the loss at the output side simultaneously, and further, the taper need not necessarily be a straight taper but a curved taper also can be used.

REFERENCES:
patent: 4535440 (1985-08-01), Mannschke
patent: 4678267 (1987-07-01), Burns et al.
Okuda et al., "Planar Gradient-Index Glass Waveguide and Its Applications to a 4-Port Branched Circuit and Star Coupler", Applied Optics, vol. 23, No. 11, p. 1745, Jun. 1, 1984.
Yamada et al., "Optical-Fibre Coupling to High-Silica Channel Waveguides with Fibre-Guiding Grooves", Electronics Letters, vol. 20, No. 8, p. 313, Apr. 12, 1984.
Kurokawa et al., "Polymer Optical Circuits for Multimode Optical Fiber Systems", Applied Optics, vol. 19, No. 18, p. 3124, Sep. 15, 1980.

Affiliated with

Also associated with

Rating

Optical divider for multimode optical fiber systems does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Optical divider for multimode optical fiber systems, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Optical divider for multimode optical fiber systems will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-104667