High capacity optical transmission arrangement

Details High capacity optical transmission arrangement High capacity optical transmission arrangement

1999-02-19

2003-08-05

Pascal, Leslie (Department: 2733)

Optical communications

Remote control

Through optical fiber or waveguide

C398S160000, C398S087000, C398S097000, C398S180000, C359S337210, C359S349000

Reexamination Certificate

active

06602002

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates generally to the field of optical communications and in particular to a high capacity, dense wavelength-division-multiplexed (DWDM) transmission arrangement.
BACKGROUND OF THE INVENTION
The capacity of dense wavelength division multiplexed optical fiber communication systems is expanding rapidly due, in large part, to the demand created by voluminous amounts of data traffic and the Internet. Long-haul commercial DWDM systems, which are generally based upon silica erbium-doped fiber amplifiers (EDFA's), are limited to a capacity of much less than 1 Tb/s due to the limited bandwidth of the EDFA's.
Experimental long-haul transmission exhibiting 32×10 Gb/s capacity using wide band silica EDFA's was reported by Y. Sun et al., in an article entitled “Transmission of 32-WDM 10 Gb/s Channels over 640 km using Broad-band, Gain-Flattened Erbium-Doped Silica Fiber Amplifiers”, that appeared in IEEE Photon. Technol. Lett., Vol. 9, No. 12, pp. 1652-1654 in 1997. The channel spacing for the arrangement was 100 GHz, which corresponds to an ITU standard. Subsequently, a transmission exhibiting 50×10 Gb/s capacity was reported by H. Tagu et al., in an article entitled “A half Tbits/s (50×10.66 Gb/s), over 1600 Km Transmission Experiment using Widely Gain-flattened EDFA Chain”, at ECOC 97 in Edinburgh, UK, Paper PD, pp. 13-16, 1997. In that experiment, the spacing between amplifiers was 50 km—a much more suitable distance for such applications as trans-oceanic links. For terrestrial applications however, longer spans are preferable to further reduce the number of amplifiers in the transmission path.
Consequently, additional long distance transmission arrangements are desired.
SUMMARY OF THE INVENTION
We have developed a high-capacity optical transmission arrangement exhibiting 1 Tb/s transmission capacity. The arrangement comprises a plurality of optical sources and a plurality of wide-band optical amplifiers connected in series, wherein each individual amplifier includes a “split-band” architecture in which individual sub-bands of the optical energy traversing the amplifier are separated and then amplified in parallel prior to recombination and subsequent output.
Further features and advantages of the present invention, as well as the structure and operation of various embodiments of the present invention are described in detail below with reference to the accompanying drawing.


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