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Role of distributed amplification in designing high-capacity soliton systems

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Abstract

We discuss the importance of distributed amplification for high-speed soliton communication systems through numerical simulations by considering the distributed gain provided by stimulated Raman scattering or erbium dopants. Hybrid amplification schemes are also considered. At a bit rate of 40 Gb/s, the use of distributed amplification is found to improve the transmission distance (deduced from the Q parameter) by a factor of up to three for Raman amplification and >5 for erbium dopants, compared with the case of lumped amplifiers. The increase in transmission distance is by a factor of about two for 80-Gb/s soliton systems when dense dispersion management is used.

©2001 Optical Society of America

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Figures (5)

Fig. 1.
Fig. 1. Net gain G(z) versus distance for hybrid (top), distributed Raman (middle), and d-EDFA schemes (bottom).
Fig. 2.
Fig. 2. System performance of the 40-Gb/s soliton system for the four amplification schemes. Horizontal line corresponds to a bit-error rate of 10-9
Fig. 3.
Fig. 3. Eye diagrams at a distance of 2000 km for the 40-Gb/s soliton system for the four amplification schemes.
Fig. 4.
Fig. 4. System performance of a 80-Gb/s system for the four amplification schemes.
Fig. 5.
Fig. 5. Pulse-to-pulse interaction for a 80-Gb/s soliton system for (a) lumped, (b) hybrid, (c) distributed-Raman, and (d) d-EDFA schemes.

Equations (2)

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i A z β 2 2 2 A t 2 + γ A 2 A = i 2 ( g α ) A + T R A A 2 t ,
G ( L A ) = 0 L A [ g ( z ) α ( z ) ] d z = 0 .
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