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US 4,723,828 AGranted
Bandwidth enhancement of multimode optical transmisson lines
AssigneeNorthern Telecom Limited
InventorsPhilip-Michael Garel-Jones, Richard S. Lowe
Life of this patent
Estimating the term…
Abstract
To improve pulse dispersion of a multimode fiber transmission line, it is spliced to a short length of fiber adapted to strongly attenuate mode groups propagating near the core center.
Claims10
An apparatus, comprising:
- a multimode optical fiber transmission line having a light input end, and a short length of fiber having the characteristic of strongly attenuating at least one light mode group passed through said fiber without attenuating other mode groups of different order, said short length of fiber having a low refractive index central core region for attenuating an axially propagating mode group and having a light output end coupled to said light input end of said multimode optical fiber transmission line.
A method, comprising:
- providing a multimode optical fiber transmission line;
- and coupling to said line a short length of fiber having the characteristic of strongly attenuating at least one light mode group passed through said fiber without attenuating other mode groups of different order and having a low refractive index central core region for attenuating an axially propagating mode group.
Dependencies are inferred from the claim text.