Study Of 14XXnm Raman Fiber Laser And Implementation Techniques

With the development of Internet, ISDN and multimedia technique, the global communication services increase dramatically, the service of communication will turn to broadband service charactered as high speed IP data and multimedia data which demands that the optical fiber communication system run with a larger capacity and a faster transmission speed than before. DWDM emerges as the times require and requires the optical fiber transimission band to be broadened from C band to L band and S band. But the available gain band of EDFA is now being used up. FRA is an all-optical amplifier, its physics principle is Stimulated Raman Scatter, its pump is a powerful laser and its gain media is the transmission fiber. Some of its characteristics, such as broad gain band, high gain and distributed amplifier, have important practical meanings to the optical fiber transmission system, especially to the DWDM system. While optical fiber Raman laser (RFL) can be a good pump of FRA. The coupling coefficient between FRL and the transmission fiber is very small, so the pump and the amplifier can be compatible easily. This dissertation analyzes the principle of SRS and designs of the 14xx Raman fiber laser module. On the basis of the SRS, we operate a series of experimental tests. The details show as follows: (1) SRS's basic theory is detailed. The properties of SRS are discussed, including gain saturation property, polarization correlation and so on. (2) Discussing the main factors in 14xxnm RFL designing, Begin with the study of Bragg fiber grating's principle,analyzing the principle of cavity structure and configuration. The research and simulation of one/two-order Raman cavity. (3) The main methods of design in RFL module are introduced.after analyzing realize many kinds of driver/temperature control circuit,a new ideal of design a more steady,effective,flexible temperature control system was provided. (4) Base on the theory research and the new driver/temperature control modul,A 14XXnm series RFL with the threshold less than 220mw was achieved successfully. And its slop over 30%, tuning range over 30nm.