Optical fiber transmission system with compensation for line distortions
First Claim
1. A system for transmission of a digital signal having a given passband, on a transmission line with optical on-line amplification, said transmission line being formed by a plurality of optical fiber sections and a plurality of optical amplifiers, each of said optical amplifiers being interposed between two adjacent optical fiber sections, said system comprising at least one device for on-line compensation of distortions induced in said digital signal, notably by noise and propagation on said transmission line, said on-line compensation device comprising:
- at least one bandpass optical filter having a passband whose value is substantially comparable to the passband of said digital signal, said at least one bandpass optical filter being interposed on-line between one of said optical fiber sections and one of said optical amplifiers; and
at least one saturable absorbent element that is a non-linear passive optical element and having an absorption that depends decreasingly on optical power of said digital signal, time taken for said saturable absorbent element to go from maximum absorption without saturation to minimum absorption with saturation and vice-versa being shorter than duration of each of the pulses forming said digital signal, said at least one saturable absorbent element being interposed on-line between one of said optical fiber sections and one of said optical amplifiers.
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Accused Products
Abstract
A system for transmission of a digital signal on a transmission line with an optical on-line amplification. The transmission line is formed by a plurality of optical fiber sections and a plurality of optical amplifiers. Each of the optical amplifier is interposed between two adjacent optical fiber sections. The system includes at least one device for on-line compensation of the distortions induced in the digital signal, notably by the noise and the propagation on the transmission line. The on-line compensation device includes at least one bandpass optical filter having a passband whose value is substantially lower than that of the passband of the digital signal before transmission, and at least one saturable absorbent element that is a non-linear passive optical element having an absorption that depends decreasely on the optical power.
21 Citations
15 Claims
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1. A system for transmission of a digital signal having a given passband, on a transmission line with optical on-line amplification, said transmission line being formed by a plurality of optical fiber sections and a plurality of optical amplifiers, each of said optical amplifiers being interposed between two adjacent optical fiber sections, said system comprising at least one device for on-line compensation of distortions induced in said digital signal, notably by noise and propagation on said transmission line, said on-line compensation device comprising:
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at least one bandpass optical filter having a passband whose value is substantially comparable to the passband of said digital signal, said at least one bandpass optical filter being interposed on-line between one of said optical fiber sections and one of said optical amplifiers; and at least one saturable absorbent element that is a non-linear passive optical element and having an absorption that depends decreasingly on optical power of said digital signal, time taken for said saturable absorbent element to go from maximum absorption without saturation to minimum absorption with saturation and vice-versa being shorter than duration of each of the pulses forming said digital signal, said at least one saturable absorbent element being interposed on-line between one of said optical fiber sections and one of said optical amplifiers. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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Specification