Fiber taper particularly useful for coupling a monomode fiber to

Details Fiber taper particularly useful for coupling a monomode fiber to Fiber taper particularly useful for coupling a monomode fiber to

1986-11-24

1989-01-03

Laroche, Eugene R.

350 9633, G02B 632

Patent

active

047952288

ABSTRACT:
A fiber taper in the form of a fiber with a conically tapering at one end and having a step-shaped refractive index profile which is particularly used for coupling a single-mode fiber to a semiconductor laser. The fiber will have a core with a high index of refraction surrounded by an intermediate core layer with an index of refraction being lower by a defined index of refraction difference than the index of refraction of the core. The intermediate core layer is surrounded by a jacket or cladding layer of a lower refractive index which is lower than the refractive index of the core layer by a defined refractive index difference. An expanding beam is established given such a taper and an adiabatic mode matching from one to the other core can be achieved along the taper.

REFERENCES:
patent: 4266851 (1981-05-01), Salisbury
patent: 4306767 (1981-12-01), Kawachi et al.
patent: 4448480 (1984-05-01), Witte
patent: 4565558 (1986-01-01), Keil et al.
patent: 4589897 (1986-05-01), Mathyssek et al.
R. Keil et al., "Experimental Investigation of the Beam Spot Size Radius in Single-Mode Fibre Tapers" Electronics Letters, V. 20, No. 15, Jul. 19, 1984, pp. 621-622.
R. Keil et al., "Coupling Between Semiconductor Laser Diodes and Single-Mode Optical Fibers" Siemens Forsch.-u. Eutwickl.-Ber., V. 13, Nr. 6, 1984, pp. 284-288.
D. Marcuse, "Loss Analysis of Single-Mode Fiber Splices" The Bell System Technical Journal, V. 56, No. 5, May-Jun. 1977, pp. 703-718.

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