The main advantages of optical soliton communication

All-optical optical soliton communication is a new generation of ultra-long distance, ultra-high code speed optical fiber communication system, and is recognized as the most promising and pioneering cutting-edge topic in optical fiber communication. . Optical soliton communication has a series of significant advantages compared with linear optical fiber communication:

First, the transmission capacity is 1 to 2 orders of magnitude larger than the best linear communication system;

Second, it can Perform all-optical relay. Due to the special properties of soliton pulses, the relay process is simplified into an adiabatic amplification process, which greatly simplifies the relay equipment, making it efficient, simple and economical.

Optical soliton communication has obvious advantages over linear optical fiber communication, both technically and economically. Optical soliton communication is superior to light intensity modulation/direct detection in terms of high fidelity and long-distance transmission. methods and coherent optical communications.

Because of these advantages and potential development prospects of optical soliton communication technology, international and domestic efforts have been vigorously researching and developing this technology in recent years. These studies have laid the theoretical, technical and material foundation for the realization of ultra-high-speed, ultra-long-distance relayless optical soliton communication systems:

1. The invariance of soliton pulses determines the need for relays;

2. Fiber amplifiers, especially erbium-doped fiber amplifiers pumped by laser diodes, compensate for losses;

3. The stability of optical solitons after collision and separation is the design wavelength division complex It provides convenience;

Fourth, the use of pre-emphasis technology, dispersion-shifted fiber transmission, and erbium-doped fiber aggregate signal amplification weakens the impact of ASE under low gain conditions and expands the Relay distance;

5. The pilot filter effectively reduces the soliton time jitter caused by noise in ultra-long distances;

6. The new concept of eigenvalue communication enables Soliton communication is broadened from using only basic solitons to using higher-order solitons, thereby increasing the amount of information carried by each pulse.

This series of progress in optical soliton communication has enabled soliton communication system experiments to reach a transmission rate of 10~20Gbit/s and a transmission distance of 13,000~20,000 kilometers.