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US 6,487,005 B2Granted
Optical fiber transmission system with chromatic dispersion compensation
AssigneeFrance Telecom
InventorsThierry Georges, Daniel Le Guen, Francois Favre
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AssigneeFrance Telecom
InventorsThierry Georges, Daniel Le Guen, Francois Favre
Estimating the term…
A long-distance optical transmission system comprising pulse emitter and receiver means (1, 2) and an optical line (3) which extends between said emitter and receiver means (1, 2) and which comprises alternating segments (3a, 3b) of dispersive fibers having chromatic dispersion of opposite signs, and also having a plurality of amplifiers (4), the system being characterized in that the optical line (3) comprises a plurality of pairs of dispersive fiber segments (3a, 3b) having chromatic is dispersion of opposite signs between successive amplifiers (4), and in that the cumulative dispersion C over the majority of the segments of the optical line satisfies the relationship (R)|C|Δν2<0.3 where C is expressed in ps/nm and where Δν is the half-height spectral value of the pulses expressed in Thz.
A long-distance optical transmission system comprising pulse emitter and receiver means and an optical line which extends between said emitter and receiver means and which comprises alternating segments of dispersive fibers having chromatic dispersion of opposite signs, and also having a plurality of amplifiers, said optical line comprising at least one pair of dispersive fiber segments having chromatic dispersion of opposite signs between successive amplifiers, the system being characterized in that said optical line comprises a plurality of such pairs between successive amplifiers, and in that the cumulative dispersion C over the majority of the segments of the optical line satisfies the relationship
Dependencies are inferred from the claim text.
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Using dispersion-compensating fibres: with dispersion management, i.e. using a combination of different kind of fibres in the transmission system
Fibre lasers: fibre amplifiers
In optical amplifiers: by controlling the optical pumping
Using scattering effects, e.g. stimulated Brillouin or Raman effects: in an optical fibre
Term ended 21 Jul 2018 (estimated)
This application claims priority from PCT application PCT/FR00/00044, filed Jan. 11, 2000, which is based upon French national application 99/00184, filed Jan. 11, 1999.
The present invention relates to optical fiber transmission systems.
In particular, an advantageous application of the invention lies in long-distance transmission systems, and in particular in transoceanic transmission systems which need to be capable of carrying information over distances in excess of 5000 kilometers (km).
Other characteristics and advantages of the invention appear further from the following description. The description is purely illustrative and non-limiting. It should be read with reference to the accompanying figures, in which:
FIG. 1 is a diagram of a transmission system constituting a possible embodiment of the invention;
FIG. 2 is a graph plotting maps of cumulative dispersion in a prior art transmission system and in a transmission system constituting a possible embodiment of the invention.
The system shown in FIG. 1 has emitter means 1, receiver means 2, and an optical transmission line 3 which extends between said emitter and receiver means 1 and 2.
The emitter means 1 generate an optical signal constituted by a succession of RZ pulses. The receiver means demodulate the signal after it has been transmitted by the line 3.
This optical transmission line 3 includes a plurality of amplifiers 4 which are regularly distributed along its length.