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US 6,888,991 B2Granted
Single-mode fiber systems
AssigneeFitel USA Corp.
InventorIan A. White
Life of this patent
Estimating the term…
Abstract
Single-mode optical fiber systems, incorporating fiber of core radius of sufficient size to support the fundamental mode together with from one to three higher order modes, exhibit performance/cost advantages relative to systems based on traditional single-mode fiber.
Claims13
Wavelength Division Multiplexed optical waveguide system providing for a “primary DWDM channel set” at a “primary system wavelength”, the said system including:
- a transmitter, a receiver, and optical amplifiers, together with a transmission line of optical fiber including at least one fiber span,
- CHARACTERIZED IN THAT
- a substantial length of fiber constituting such fiber span is “few-mode” fiber of core radius sufficient to support at least one high-order mode in addition to the fundamental mode at the primary system wavelength, in which the few-mode fiber includes a continuous stream of longitudinally spaced perturbations in value of index-of-refraction, of spacing to selectively extract high-order mode(s) by radiation, whereby the said few-mode fiber is effectively single-mode-operating, and in that provision is made for total launched power of at least 400 milliwatts (mW) into the said fiber span.
Dependencies are inferred from the claim text.