Investigation Of All Optical Buffer Based On Gain Transparent Semiconductor Optical Amplifiers

With the growing of user demand, the optical fiber communication capacity of transmission also grew rapidly. O/E/O conversion in the communication network's exchange nodes caused "electronic bottleneck", which has become one of the important constraints to the development of high-speed communications network. All-optical packet switching network (OPS), as a new and effective optical switching solution in optical domain, has broad application prospects. All optical buffers have important significances, because it can overcome the "electronic bottleneck" in OPS and at the same time it is the key device to resolve the competition and congestion. In this paper, a new method to realize all-optical buffer has been proposed, which is based on traditional all-optical dual-loop buffer program. In the new program, 1550nm SOA has been changed by the gain transparent semiconductor optical amplifier (GT-SOA). This new structure maintains these advantages: original compact, easy to "read-write", which is also able to eliminate the "leakage light." All-optical switching programs based on GT-SOA have also been proposed. All of this give a new train of thought to the research of optical buffer based on SOA, and contain certain value.This thesis mainly research Dual-loop Optical Buffer (DLOB) based on GT-SOA , which is from horizontal "8" shaped structure but changed the core device of original buffer program. A new "read-write" method is achieved, which made the use of GT-SOA's transparency effects to the 1550nm signal light. Firstly, the performance of GT-SOA has been determined and transparency effects to the signal light have been found, and polarization rotation phenomenon has also been observed. Then through a series of experiments, including the synchronous experiments of signal light and control light, optical switching experiments, loop length measurement experiments, the "read-write" experiments, and storage of data frames is realized. Meticulous researches of buffer structure are made, suggestions to improve the program are proposed, and power compensation in the loop is realized, as while as avoiding the generation of "fake" leak. The NOLM switch and polarization rotation switch based on GT-SOA are proposed in this thesis, and all the desired results have been achieved.