We demonstrate a new all-fiber spectrometer based on acousto-optic tunable filter (AOTF) on cladding etched single-mode (SM) fiber. The spectrometer has a free spectral range (FSR) of 200 nm, a wavelength resolution of 2 nm, a dynamic range of 20 dB and a potential scanning rate of ~125 μs/sample. The spectrometer has the potential to be developed as a low-cost spectral monitoring device for dynamic gain equalizer (DGE) in Er-doped fiber amplifier modules.
Theory of acousto-optic coupling ring resonators is investigated in this thesis, and such a fiber ring resonator is based on the acousto-optic fiber couplers special characteristics---frequency-shift and filtering. In the resonant cavity, this kind of resonator will build up multiple-beam interferometry with frequency shift. Such a resonator can convert continuous wave laser to pulse train.
The spectral characteristics of gain-clamped EDFAs including pump- and laser-controlled was investigated theoretically and experimentally. It is found that if the average population inversion can still be managed, the gain profiles should be also clamped.
The simulation of a new type of GaAs/GaAlAs quantum well infrared photodetectors based on a new physics mechanism has been performed. The essential work is concentrated on the device parameters' influence on the energy levels and absorption peaks, they would have important effects on device design. Moreover, a new characteristics-infrared detector with bias-tuned wavelength is proposed.
A new type of GaAs/GaAlAs infrared photodetectors based on a new physics mechanism has been designed. Its simulation, manufacture, experiment measurements and analyses have been performed. Some novel important characteristics are obtained which are compared with the conventional GaAs/GaAlAs quantum well infrared photodetectors, such as, its low dark current, large absorption bandwidth, high response speed, low noise, and the choice of suitable operation bias. From our elementary work, the novel features of this kind of device will be very attractive in the application.
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