1. Introduction.- 2. Wave Motion.- 3. Envelope of a Light Wave.- 4. Envelope Solitons.- 5. Solitons in Optical Fibers.- 6. Amplification of a Soliton - Application to the Optical Soliton Transmission System.- 7. Other Applications of Optical Solitons.- 8. Influence of Higher Order Terms.- 9. Modulational Instability.- 10. Dark Solitons.- 11. Summary.- General References.- References.