Optically Controllable Logic Gate In The Single Mode Semiconductor Laser

Since the lock built-in external cavity in single-mode Fabry-Perot semiconductor laser is put forward in recent year. It is a single-mode laser radiation technology.Thanks to its built-in external cavity design and outstanding optical properties aroused the concern of the industry. Compared to traditional multi-mode semiconductor laser,single-mode semiconductor laser has a wide tuning range, single-mode radiation,self-locking, high side mode suppression ratio, inexpensive, low-power and low threshold.And it is used in the optical properties of light switches, wavelength conversion and optical modulators and other optical technology applications, and exhibits excellent performance. However, due to the single-mode semiconductor laser as a new kind laser structure, concrete of the physical mechanisms work and practical application still needs to be further explored in depth. Therefore, this paper mainly is single-mode Fabry-Perot semiconductor laser as the core element to perform light control photon logic gates arithmetic operations. Firstly, the single-mode laser structure design and implementation of the principle of single-mode radiation, the wavelength of the dominant mode and single-mode radiation power associated with the active area of the injection current and operating temperature. According to the resonance characteristics of the laser cavity modes of work, given the number of photons,the phase and the number of free carriers rate equation with a delay feedback external cavity semiconductor laser.After the single-mode semiconductor laser external laser injection, injection locking and bistable hysteresis characteristics are the two basic characteristics of the optical laser broadening applications. By properly adjusting the injection power and wavelength detuning, the laser is locked to the laser injection mold, laser itself leading mold and other side-mode laser power is suppressed. When injected into the laser mode wavelength detuning is positive(injection mold-laser wavelength larger than the corresponding laser wavelength of side mode), under conditions of injection-locked laser resonant mode, arising red shift. Conversely, when injected into the mold of the laser wavelength detuning is zero or negative(injection laser mold of wavelength is lessthan the corresponding laser side mode of wavelength). Will injected mold-laser and side-mode of laser interaction resulting in the rapid consumption of the laser carrier itself the dominant mode power decreases rapidly throughout the laser locked in at the corresponding laser side mode. Other wavelength of laser resonant mode without any change, but positive wavelength detuning and injection locking comparised, positive wavelengt detuning get locked laser spectrum has a higher side mode suppression ratio.Bistability is due to optical feedback laser cavity caused, with the wavelength detuning and injected power changes, the laser itself the dominant mode of laser and injected mold can show significant bistable hysteresis, but larger the wavelength detuning, the injection of bistable hysteresis loop with the injection of power become wider. Accroding to injection locking principle, implemented based on single-mode semiconductor laser light control photon logic gate operation, in the logic operation,single-mode laser itself the dominant mode wavelength as the target signal, the other consists of three different consecutive laser emits laser light, respectively, as two beams of signal light and a beam of the control light. In practicing work, the logic state of the control light will determine whether it can achieve a valid logic operation between the signal light beam and the target signal. When controlling light is the logic "1" signal,logic operation between injection of the signal light and the target signal is turned on;when the controlling light is adjusted to a logic "0" signal, the logic operation between the signal light and the target signal will become invalid. By adjusting the injected controlling light and signal light power and wavelength detuning, to achieve an effective light control logic operation with NAND, NOR, and NAND. By studying this paper will further contribute the single mode semiconductor lasers in optical computing and optical networking and other optical techniques of applications.