Dissertation
Dissertation > Industrial Technology > Radio electronics, telecommunications technology > Photonics technology,laser technology > Laser technology, the maser > Laser

Simulation Study of Method Of Restraining Mode Competition Based on Four-Wave-Mixing in Multi-Wavelength Fiber Laser

Author YaoZuoLiang
Tutor YaoYong
School Harbin Institute of Technology
Course Physical Electronics
Keywords Fiber lasers Multi - wavelength laser Dual-loop cavity lasers Four-wave mixing
CLC TN248
Type Master's thesis
Year 2010
Downloads 74
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With the rapid development of optical fiber communication technology, are increasingly high requirements on the use of the light source. In many lasers, fiber lasers its optical fiber communication system exactly matches the high output power and tunable significant advantage has been widespread concern, is the ideal light source of the future long-distance, high-capacity, ultra-high-speed optical fiber communication systems a. One of the core of the optical fiber communication technology dense wavelength division multiplexing technology to an urgent need for broadband multi-wavelength laser source, erbium-doped fiber ring cavity laser is very promising in this area. Multi-wavelength erbium-doped fiber laser is more concentrated in a separate C-band or L-band, the wavelength can not meet the requirements of broadband fiber-optic communication systems. Use more expensive fiber gratings and photonic crystal grating devices and structural design, cost control difficult. This paper presents the design of a new multi-wavelength erbium-doped fiber laser, which uses a dual-loop cavity structure and a unique feedback mechanism, the the CL band gain extended easily achieved with a multi-stage pump structure, but also to achieve the stability of the multi-wavelength output . Relatively inexpensive dispersion shifted fiber four-wave mixing suppression mode competition, with tunable optical fiber filter to adjust the channel spacing, the formation of multi-wavelength output to meet the ITU standard. Went on to propose a multi-wavelength fiber laser cavity, the establishment of a theoretical model of the system, the rate equations and transport equations. According to the four-wave mixing theory established theoretical models and equations using four-wave mixing suppression mode competition. And detailed description of the method of using the model to calculate the laser output, according to the theoretical model calculation algorithm. Reverse ASE (amplifiedspontaneousemission) the initial value of the light can only be seen in the end of the gain medium, the initial value of the starting point of the boundary conditions in the gain medium is difficult to obtain, this paper introduces the shooting method to solve the problem of a series of boundary conditions in the iterative process. On this basis, we appropriately simplified model too complex simulation study of the program, a series of multi-wavelength output power spectrum, and analysis of simulation results with theoretical results, get pumped The influence of power and nonlinear optical fiber length of the two parameters of the laser output. Finally, the lack of work to do some analysis.

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