Optical fiber transmission line for wavelength division multiplexing signals
AssigneeNEC Corporation
InventorYoshihisa Inada
Life of this patent
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Abstract
A wavelength division multiplexing optical fiber transmission line that reduces signal deterioration caused by dispersion even in a transmission system having a high-speed transmission rate, and is suited to a long-distance transmission. A dispersion management transmission line is connected between optical repeaters. The dispersion management transmission line has 3 to 6 pairs of fiber sections, of which each has a positive dispersion fiber and a negative dispersion fiber, connected in series. Dispersion compensation is made step by step over four (4) times for dispersion and a dispersive slope, which were accumulated by the front-stage positive dispersion fiber, by the next-stage negative dispersion fiber.
Claims9
A wavelength division multiplexing optical fiber transmission line comprising a dispersion management transmission line,
- said dispersion management transmission line consisting of 3 to 6 pairs of fiber sections arranged in series without intervening elements for configuration, each of said pairs including a positive dispersion fiber section and a negative dispersion fiber section, and
- wherein wavelength dispersion of said positive dispersion fiber section is positive;
- wherein dispersion of said negative dispersion fiber section wavelength dispersion is negative, alternatively arranged, and
- wherein signal deterioration caused by interaction between the accumulated dispersion is reduced, wherein a mean dispersion value within the dispersion management transmission line is ±250/(L·N)±0.5, where L is the length of the dispersion management transmission line, and N is a span number of dispersion management transmission channels that are consecutively inserted between block dispersion compensators.
A method for transmitting wavelength division multiplexed signal,
- said method consisting of 3 to 6 steps in series
- wherein each of said steps comprises:
- positively dispersing;
- and
- negatively dispersing, wherein signal deterioration caused by interaction between the accumulated dispersion is reduced, such that a mean dispersion value within a dispersion management transmission line is ±250/(L·N)±0.5, where L is the length of the dispersion management transmission line, and N is a span number of dispersion management transmission channels that are consecutively inserted between block dispersion compensators.
Dependencies are inferred from the claim text.