Distribution laws of the ghost reflection at the image plane of the mid-infrared transmission optical system with four lenses are researched through experiments. Research results show that with the changing of the incident light angle, both the ghost image center and the focus of the transmission light at the image plane shift relative to the center of field of view. While under the same conditions, the ghost image shows a larger displacement than the transmission focus. According to this imaging law, an effective method is carried out to suppress the ghost image. By tilting the main lens rising to ghost image with a certain angle, the ghost image will be removed from the field. The validity of this method is also verified by software simulation. The method provides an effective way to avoid ghost image in complicated optics system.

A micro-hole structure fiber Fabry-Perot (FP) cavity is fabricated using an excimer laser to process a micro-hole in single mode fiber (SMF). And the theoretical and experimental research of temperature response characteristics of the FP cavity is performed. Research results show that when the temperature of external environment changes, the FP cavity length and the refractive index of medium in the cavity will change, which will lead to sensor output spectrum shifting. By observing the shifting of the peak or valley values of spectrum, the sensing inspection of environment temperature can be realized. Experimental results show that spectrum shifts to short wavelength gradually with the increasing of temperature. The wavelength shifting is linear with the temperature changing, and the corresponding temperature sensitivity and linearity are -0.152 nm/℃ and 98.8% respectively. The micro-hole structure fiber FP temperature sensor has the advantages of simple structure, low cost and good practicability, and it can meet the needs of different temperatures. The research results can provide a reference for the application of this device in sensing.

Edge filter has been widely used in fiber grating sensing systems and the principle is to convert the wavelength offset into the change of optical power, which has the advantages of fast response and large dynamic detection range. In order to achieve a periodic edge filter named low-loss jammed-array sawtooth (JAWS) filter, a finite reflection virtually imaged array (FRVIA) is proposed and demonstrated. Comparing with virtually imaged phased array (VIPA), FRVIA has a low reflectivity in the back side, with the differences of output light intensity distribution, spectral resolution and output aperture and so on. By numerical simulation, the parameters of the low-loss JAWS filter have been optimized, a low-loss JAWS filter has be achieved with up to 70% duty cycle and lower than 14 dB loss.

The development and application demands of polyaniline (PANI) electrochromic films are introduced. Among all the electrochromic film materials, flexible material is a key research direction. The working mechanism of typical polyaniline materials is analyzed. Based on printing electronic technology, the experimental researches on the preparation technology of the flexible electrochromic film are performed. Polyaniline solution proportion experiment, performance testing process, and other researches are carried out, which provides the best ratio for polyaniline electronic printing ink preparation. Through electronic silk screen printing tests and the improvement of the chemistry formulation of electronic printing ink, the key technology of the flexible polyaniline electrochromic film production based on printing electronic technology is solved.

The phosphor glass is a promising material to improve the package reliability of high power LED. The phosphor glass is prepared by sintering a mixture of phosphor and borosilicate glass in high temperature. The effects of different preparation conditions on the luminescent properties of the phosphor glass are researched by controlling the temperature, time and the ratio of phosphor. Research results show that the better luminescence performance is obtained when the mixture phosphor and borosilicate glass is sintered at 700 ℃ for 30 min. If the temperature is too low or the time is too short, the phosphor would not be uniformly dispersed in the phosphor glass. If the temperature is too high or the time is too long, the luminescent properties of the phosphor glass would be decreased because of the reactions between the glass matrix and the phosphor. According to the research results, the best luminescence performance is gained as the mix of 3 wt% phosphor.

The noise enhancement effect of photovoltaic HgCdTe detectors caused by ultrashort pulse laser is discovered in experimental study, and its source and induction routes are researched through the experiments. The suggestions to suppress the noise enhancement effect are proposed. Experimental results show that the noise enhancement effect is primarily caused by the amplifying power supply of the ultrashort pulse laser at high-frequency which would produce stronger electromagnetic pulse. The electromagnetic pulse passes through free space to induce directly the circuits of detectors to produce noise enhancement effect, and the external link circuit between the detector and the laser and the photosensitive element is not the main association. Electrostatic shield and extending the distance between the detector and the laser can effectively reduce this kind of noise.

A method of using asynchronous delay sampling and generalized regression neural network (GRNN) to monitor optical signal noise ratio (OSNR) and chromatic dispersion (CD) is proposed. In the 40 Gbit/s 16QAM communication systems and the nonlinear channel environment, the feature quantities are extracted by asynchronous sampling, and GRNN is used to realize OSNR and CD monitoring. Comparing with other neural network methods, GRNN method can not only realize the monitoring of OSNR and CD, but also has the advantages of fewer parameters, high efficiency algorithm and easy optimization.

In a laser range finding system of a high maneuvering target reconnaissance system, when background changes randomly, the operation distance of the system is as far as a few dozens of kilometer. According to background noise, the operation state is adjusted adaptively to achieve higher sensitivity and signal noise ratio (SNR). According to the background noise and multiplication characteristics of the avalanche photo diode (APD) detector, the adaptive bias control method is researched. Based on constant false alarm rate control method, the laser range finding receiving front-end circuit is designed. The circuit gain and avalanche multiplication factors are controlled by time programmable gain (TPG) and time programmable bias (TPB) signals respectively. The adaptive characteristics are tested under static closed loop state. The dynamic closed loop state in field experiment is tested. The experiment of long-distance target detecting is completed through the experimental devices.

The quasi-three energy levels laser rate equation model of Tm:YAP slab pumped by two fiber coupled diode lasers is developed. Based on the solution of the equation, the influence on Tm:YAP laser output power is simulated, including the working temperature distribution of the crystal, up-conversion effect, the appropriate range of the spot radius and the transmission efficiency of output lens. It provides the necessary numerical analysis basis of designing the high power Tm:YAP slab laser.

The laser active imaging system based on digital micromirror device (DMD) post modulation is analyzed and the mathematical model is set up. The influence factors are analyzed by simulation, and the simulation results are given. The results show that the laser intensity and the aperture of the receiving optical system have great influence on the system detection distance.

In order to evaluate the influence of laser intensifier to the performance of the image intensifier, the irradiation experiment of continuous laser to the image intensifier is carried out and the influence of laser irradiation on the gain characteristics of the intensifier is analyzed. Experimental results show that with the increasing of the incident laser power, the image intensifier is gradually developed to the surface saturation by the point saturation, and the diameter of the saturated spot is linear with the cube root of the incident light intensity. The laser illumination required for the point saturation is about 1.64 μW/m2 and the laser illumination required for the surface saturation is about 1 371.9 μW/m2. The maximum laser illumination allowed for the linear gain of the image intensifier is about 8.95 μW/m2, which indicates that the point saturation pre-image intensifier is in a linear gain state. With the increasing of the incident laser power, there is no crosstalk between the pixels of the image intensifier, which indicates that the gain saturation of the image intensifier appears, and the output light intensity is strongly affected.

High power laser output can be obtained by a power beam combiner. The supercontinuum laser is chosen as the input light source to obtain a broadband. So the broadband power combiner with the combination of the both is a hotspot. The 3×1 broadband power beam combiner based on the incoherent power combination of supercontinuum sources is simulated and analyzed. The various of the transmission efficiency and the beam quality of different combined wavelengths are compared and analyzed. By comparing and analyzing the simulation results of different wavelengths, the combined effect of the 3×1 broadband power combiner on the broadband light source is evaluated. And it can provide references for fabrication and use of the boradband power combiner.

The effects of mode coupling and difference mode group delay on signal transmission in mode-division multiplexing system can be compensated with equalization to realize signal reliable transmission. Compared with time-domain equalization, frequency-domain equalization can effectively reduce digital signal processor (DSP) complexity. FD-CMA (frequency-domain constant modulus algorithm) and FD-MMA (frequency-domain multi-modulus algorithm) are used to simulate and compare in 2×56 Gb/s 16QAM mode-division multiplexing system. The results show that the equalization performance of FD-MMA is better than FD-CMA in constellation diagram and bit error rate (BER) performance. At the error bit rate of 10-3, FD-MMA has a 2.8 dB improvement of optical signal-to-noise ratio than FD-CMA.

According to the basic functions and main technical characteristics of a certain airborne avionics equipment, a test system is designed. The overall design, hardware and software of the test system are described. The hardware design is critical to realize the function of the test system. The function modules of excitation signal generation, fault information injection and data acquisition are discussed in detail. The classification and work flow of the software function modules are described. The test system has been applied to the debug, delivery acceptance and troubleshooting of the airborne avionics equipment. It shows that the test system has the reasonable design software and hardware, high automation, stable and reliable work in application, which improves the test efficiency and saves the human resource.

The connection between the grating and the metal substrate in the fiber grating pressure sensor is mainly divided into the adhesive process and the metallized packaging process. The creep of the sensor will be caused by different processes. It will also directly affect the measurement accuracy of the sensor. Experiments of the self designed cantilever beam fiber Bragg grating pressure sensor are performed, and the experimental results show that the linear fitting of the pressure and wavelength of the fiber Bragg grating pressure sensor made by the metallized packaging technology and the 353ND glue packaging process are both higher than 0.998. The fiber Bragg grating pressure sensor with 353ND glue and steel metal substrate is within the 0~6 MPa pressure range. The maximum wavelength shift caused by the bending of the cantilever beam in 5 min is 8 pm. The research also shows that the sensitivity of the same structure metallized fiber Bragg grating pressure sensor is 3.4 times than that of the bare fiber grating sensor with 353ND glue.