Based on stimulated Raman scattering theroy in optical fiber, an all-optical wavelength conversion coupler is designed. The wavelength converter was processed to achieve an equal power in each channel by cascaded optical fiber. All-optical wavelength conversion theoretical model, the design scheme and implemented method are presented. The simulations are calculatated by OptiSystem with a pump signal and 4 continuous probe signals. 4 wavelength converted continuous probe signals and analogous input-output code type are showed as the simulation result. The inceasing conversion efficiency and the growing extinction ratio are presented by the wavelength growth. The maximum conversion efficiency and extinction ratio are -34 dB and 36.68 dB respectively. The decreasing Q factor is showed with probe signal wavelength gorwth and 128.29 is the maximum Q factor value. 4 outputs signal light peak power and extinction ratio are approximately the same after cascading the optical fiber. The decreasing Q factor value is presented by cascading the optical fiber and the maximum value is 89.5455. The feasibility is verified by the scheme.

A 650 nm monolithic optical receiver for plastic optical fiber communication is proposed, including a photodetector, a tranimpedance preamplifier, a single to differential conversion, a cascade of differential amplifiers, an output buffer and an offset voltage compensation. Based on reasonable assumption and approximation, the spectral response of photodetector is analyzed according to its steady-state continuity equation and boundary conditions. Analysis of frequency response is established due to the basic equations of the photodetector by Laplace transform method. The layout area of monolithic optical receiver is about 832×948 μm2 with 0.5 μm BCD process. Measurement results indicate that the responsivity of photodetector is 0.26 A/W for 650 nm at 5 V reverse bias. The sensitivity is -14.6 dBm at 180 Mbps and bit error rate less than 10-9. A clear eye diagram is demonstrated for 100Mbps pseudorandom binary sequence and bit error rate less than 10-9.

Blind equalization system model is established with atmospheric turbulence time-varying channel. Under different scintillation distribution conditions, performances of two kinds of adaptive blind equalization algorithms are compared such as convergence, mean square error (MSE) and stability, and clustering in constellation of wireless optical subcarrier signal are analyzed. With the increasing of turbulence intensity, variable step-size constant modulus algorithm (CMA) algorithm based MSE has faster convergence, smaller MSE but poor stability, and scale factor must be decreased to ensure convergence compared with CMA algorithm. Meanwhile, compared with Gaussian channel, under the same signal-to-noise ratio, iterative step length factor and scale factor under the turbulence channel is smaller, but mean square error is bigger than in Gaussian channel. The simulation results show that two kinds of algorithms can effectively improve the convergence of constellation diagram, and have important significance in improving detection rate of constellation diagram.

In order to solve the three problems of terahertz optical asymmetric demultiplexer-cross phase modulation effect based all-optical exclusive-OR gate, which are that the strict demand of synchronization; cannot be applied in the situation of not return to zero signal input; the speed of exclusive-OR operation is limited by carrier recovery speed of semiconductor optical amplifier. An all-optical exclusive-OR gate was proposed which utilizes the structure of terahertz optical asymmetric demultiplexer and is based on four wave mixing effect, because of based on four wave mixing, this exclusive-OR gate can radically solve the mentioned three problems of terahertz optical asymmetric demultiplexer-cross phase modulation based exclusive-OR gate. This paper illustrates the principle of this exclusive-OR gate through theoretic analyse, and realizes the exclusive-OR operation for the input of 40 Gbps, return to zero signal; 80 Gbps, return to zero signal; 10 Gbps, not return to zero signal. The Q factor and bit error rate of exclusive-OR operation for above three kinds of input are 11.7, 2.4×10-18；8, 1.1×10-10；22, 1.3×10-40. And then, we analyse the influence on the quality of exclusive-OR output signal which is generated by change of parameter of main elements of terahertz optical asymmetric demultiplexer and temperature and dispersion effect. The feasibility and effectiveness of this exclusive-OR gate for solving the three problems of terahertz optical asymmetric demultiplexer-cross phase modulation based all-optical exclusive-OR gate are verified by theoretic analyse and simulation.

A multi-channel optical fiber Fabry-Perot demodulation system based on non-scanning correlation demodulation combining with white light interfered Fabry-Perot sensor is designed. Utilizing cylindrical lens collecting and focusing light as linear light spot and get equivalent inverted image at 2 times focal length plane, the corresponding optical model is set up; the optical characteristic analysis and parameter optimization is carried on; and the optical system and embedded demodulation system is designed. A Butterworth filter is used to filter out the background noise on the correlation signal effectively. Experiments based on the prototype demodulator show that the stability is up to 7 nm, at the measuring range of 10~40 μm, with the resolution of 8nm. The experimental results indicate that the system can achieve real-time measurement, high measurement accuracy, stability and consistency, and can realize multi-point detection and improve the multiplexing capacity.

The hydrogen sensor probe is prepared by combining Pt-loaded WO3 coating with optimized synthesized process and enhanced temperature sensitivity fiber Bragg grating. In this way, the performance of the hydrogen sensor can be significantly improved. The experimental results show that Pt-loaded WO3 coating annealed under 315℃ for an hour has better sensitivity toward hydrogen when Pt∶W ratio is controlled at 1∶5. The temperature sensitivity of fiber Bragg grating which is enhanced by exerting axial prestress is 16.3 pm/℃, which is nearly twice of common fiber Bragg grating. When hydrogen concentration are 10 000 ppm, 2 000 ppm and 400 ppm, the wavelength shifts of fiber Bragg grating are 720 pm, 115 pm and 20 pm respectively, and fiber Bragg grating can reach its maxium wavelength shift within one minute. Moreover, the wavelength shift equal to 7.2 pm, 5.7 pm, 5 pm per 0.01% of H2 concentration and the therhold of hydrogen sensor can reach to 0.04%.

A bidirectional quantum controlled teleportation scheme using the entanglement property of six-qubit maximally entangled state was presented. In the theoretical scheme, the six-qubit maximally entangled state was employed as the quantum channel linking three legitimate participants. Users were both sender and receiver. Alice transmitted an arbitrary single qubit state of qubit a to Bob and Bob transmitted an arbitrary single qubit state of qubit b to Alice via the control of the supervisor Charlie. Users carried out the Bell state measurements on their own particles and publicly announced their measurement results via a classical channel. Then they operated proper unitary transformation on their own particles, respectively. The bidirectional quantum controlled teleportation was successfully realized.

A scheme for generating Cluster state with the quantum non-demolition polarization parity gate was presented based on weak cross-Kerr nonlinearity and linear-optics elements. The nonlinearity of cross-Kerr medium was introduced in the present scheme in order to achieve effectively the interaction between photons and achieve the desired photon entangled state. The success probability and the perfect fidelity for generating a cluster state could be enhanced due to introducing the nonlinearity of cross-Kerr and quantum non-demolition measurement on the coherence probe modes. The distinct feature of the present scheme is its preparation for a polarization four-photon cluster state with near unity success probability and near perfect fidelity. Furthermore, the cluster state of 3N+1 photons could be obtained with the help of linear optical elements based on the present scheme.

The terahertz time domain spectroscopy technology is used to measure the terahertz spectral of three ellipse gold rings structure which deposited on the silicon substrate by the photo lithography technique and the thickness of gold film are about 100 nm. Then the physical mechanism of transmission enhancement through the structures is analyzed. The results show that the transmission coefficients of these structure samples are above 0.7 which suggests the sharp transmission enhancement in THz wave band. When the angle between the THz wave polarization direction and the long axis of elliptic ring is 90°, the resonance peak at 1.67 THz is result from the coupling between the short axis direction of electronic formed dipole oscillation and the incident THz wave. While the angle is 0°, the periodic array sample has not obvious resonance peak, the resonance peak of the patter array sample is obviously than the fractal array sample, the worse symmetry of the samples′ structure, the richer information of the transmission spectra. Moreover, the phase differences spectrums are also verify the existence of resonance enhanced transmission.

Aiming at the framing photography frequency of about 108 frame/s or above, a kind of 3-frame framing camera with ultra high-speed and high performance is developed and put into operation. The optical principle of the camera is based on splitting the focused imaging light beam in the field of image space. It features good imaging quality and high light energy efficiency. The lens coupled gated image intensifier with high speed shutter control ability, cooled scientific CCD camera and the high speed controller based on large scale field programmable gate array with system trigger and shutter trigger are the main portions. This framing camera can capture 3 frame images with ultrahigh speed of above 3.3×108 frame/s. The minimum exposure time for each image is about 3 ns and can be independently setup in a wide range of from several ns to s. The frame interval time can also be adjusted at discretion step from 0 ns to second level. The effective image size is Φ25 mm and image array is 1 024×1 024. The spatial resolution is about 30 lp/mm. The framing camera features good linearity, good response uniformity, and excellent flexibility in applications.

In order to assess the performance of detection system for X-ray pulsar navigation, the expression of the signal-to-noise ratio (SNR) and the minimum detectable power are derived in the photon counting mode of the system. Experiment system to measure the SNR and the minimum detectable power is setup. The minimum detectable power is measured; the SNRs at different integration time, optical power and threshold voltage are calculated. The X-ray pulse profile is reconstructed by measuring the time of arrival (TOA) of the X-ray photons. Experimental results show that the SNR of the pulse profile is improved and the curve of the pulse profile tends to smooth with the increasing of optical power and the integration time; the SNR is 26.3 and the pulse profile is optimal when the threshold voltage is -150 mV; the minimum detectable power of the system is 3.5×10-16 W.

Based on MATLAB software and iterative method, a kind of trial-error method for different natural environments (NET) is proposed. Solar module temperature, solar radiation and their effects on series resistance are taken into account in this model. Nine I-V curves are measured under natural environmental conditions to predict the model parameters under STC (i.e. open voltage Vocrefi, short current Iscrefi, maximum voltage Vmrefi, maximum current Imrefi, maximum power Pmrefi,i=1~7) . Increasing the number of the measured I-V curves may help for obtaining more accurate real value of Vocref, Iscref, Vmref, Imref, Pmref under STC. In order to test the validation of this model, the proposed model is used to evaluate the solar energy output of the module under a condition except for the nine I-V curves with nine different natural conditions. The deviation of the output of the calculated PmC from the measured output PmE under the investigated condition (G=647 W/m2, T=67.7℃) turns out to be 2.73%, which means that this kind of trial-error model can be used to design PV modules and predict the yield of the module under arbitrary natural environment.

Different decay rates are observed by time-resolved pump-probe spectroscopy at different location at the injected electron spin packet, which indicate that spin diffusion exert influence on the measurement of the time constant of electron spin relaxation. The kinetic equation of spin transport is solved. The solution shows that spin diffusion influence electron spin relaxation time by two factors with . One factor relates to the distance between the center of pump spot and the center of probing spot, the other relates to pump spot size. Two conditions under which one may neglect the influence of diffusion are proposed: 1) the center of pump spot and the center of probing spot overlap; 2) pump spot size is large enough. Results show that the more the center of pump spot close to the center of probing spot and the larger pump spot size is, the less spin diffusion influence the measurement of electron spin relaxation time.

Using a heated shock tube and an intensified spectroscopic detector CCD, transient emission spectra of n-dodecane in the combustion reaction were measured in the range of 200~900 nm. Experiments were conducted at pressure of 4.0 atm, temperatures of (1 200~1 300) K, equivalence ratios of 0.5, 1.0, and 2.0. Results show that the main emission bands are attributed to OH, CH and C2 radicals produced during the combustion process. In the different equivalence ratios, the emission intensities of OH(306.4 nm)/CH(431.4 nm)/C2(516.4 nm) are significantly different in the combustion process, which indicates that fuel-lean situation is good for generation of OH radicals, and fuel-rich situation is good for C2. Different diluent gases lead to different combustion temperatures when the fuel burns, which causes the different patterns of the emission spectra of the fuel. The variation of OH, CH and C2 radicals produced in the combustion of n-dodecane are shown clearly by the time-resolved spectrum obtained. This research is helpful for understanding the properties and validating the mechanism of n-dodecane combustion reaction.

To overcome the shortcoming of the conventional spectrum recovery method, concepts and basic algorithms of a modern spectrum estimation are introduced. Two different methods (auto-Regressive parametric model and multiple signal classification algorithm) are used to reconstruct light spectrum from interferogram.Compared with conventional method for spectrum reconstruction, the modern spetrum estimation methods can well be adopted in spectrum reconstruction and perform excellently, especially when it is used to get higher spectrum resolution from a short series of data recorded.

In order to realize the specific spectral response of the detector, full-color filter method can be used to calculate the match plan of color filter. During the calulation, normal spectral transmittance of the filter often be employed as the calculation basis. In many practical applications, obliquely incident light will lead the disagreement between calculated result and the actual result.In this paper, the caculation method of diffuse incident spectral transmittance about the cylindrical color filter is analyzed; a correcting model which can derive the diffuse incident spectral transmittance from normally incident spectral transmittance is proposed; a experiment system is designed for diffuse incident spectral transmittance measurment based on double integrating sphere. A set of experiments are employed to evaluate performance of the correcting model. The measurement results show that the correcting model can effectivlly derive the diffuse incident spectral transmittance from normally incident spectral transmittance with obviously lower match error. The agreement between actual measurement result and caculated result is observably improved by applying the correcting model to full-color filter method.

An analysis model for Digital Micromirror Device(DMD) of optomechatronics integration element is proposed, and the theoretic angle of diffraction is obtained by using LightTools to simulate optimization of the analysis models. and then comparing the theory angle with the result of the experiment.The results of the experiment and the simulation conclusion are consistent with each other very well.We have designed a Hadamard transform spectrometer which based on this diffraction model.And then we test the spectrometer by Halogen lamp source: the resolution ratio of the spectrometer can achieve 8 nm, signal-to-noise ratio can achieve 1 366, the center wavelength drift is only 0.408 nm, and the single acquisition time is only 0.8 second, these results show that the spectrometer has good resolution ratio , good signal-to-noise ratio, good stablity,good repeatability and good real-time ablity. The spectrometer is very good to overcome the traditional Adama spectrometer poor shock resistance, acquisition speed, low precision, has the very high market potential.

Based on the generalized Huygens-Fresnel diffraction principle and the quadratic approximation of Rytov′phase structure function, the analytical expression for the cross-spectral density matrix of the electromagnetic Gaussian Schell-model beams propagating through turbulent atmosphere is derived. The influence of the turbulent on polarization properties of the elliptically polarized electromagnetic Gaussian Schell-model beams in propagation are studied in this paper. In addition, the polarization properties of an elliptically polarized electromagnetic Gaussian Schell-model beam and a partially polarized electromagnetic Gaussian Schell-model beam are contrasted and analyzed. The results show that compared with the changes in the state of polarization of partially polarized electromagnetic Gaussian Schell-model beams, the elliptically polarized electromagnetic Gaussian Schell-model beams have the advantage of the less influence of turbulence strength. Moreover, the variations of the spectral degree of polarization of the elliptically polarized electromagnetic Gaussian Schell-model beams propagating through turbulence atmospheric are smaller than the partially polarized electromagnetic Gaussian Schell-model beams. But the variations of the orientation angle and the degree of ellipticity of the elliptically polarized electromagnetic Gaussian Schell-model beams propagating are larger than the partially polarized electromagnetic Gaussian Schell-model beams.

Surface plasmon resonance can be excited on 52.3 nm gold film through a large numerical aperture microscope objective lens (oil immersion) based on Kretschmann configuration. According to Maxwell’s equations and Fresnel’s formula, a mathematics model of the structure is established, and the intensity distribution at the back focal plane of the objective lens is simulated using Matlab and collected by imaging sensor and processed in computer. Experiment results agree well with theoretical result. The analysis of the numerical simulation and measuring result provide certain theoretical and experimental basis for the application of surface plasmon resonance imaging and refractive index detection of analyte attached to gold film.

Based on the structure of the prism, the cut angle of Wollaston-type parallel-splitting polarizing prism is derived by using refraction law. The intensity transmittance, the splitting ratio and the parallel degree of the two output beams are deduced by using Fresnel formula and intensity transmittance theory of thin film. The variation relationships of law of intensity transmittance, splitting ratio and the parallel degree of the two output beams with incidence angle or incident wavelength are simulated under the Matlab environment. Experimental results of the intensity transmittance and the parallel degree varying with incident angle are obtained. The parallel degree is in good coincidence with the theoretical one and the law of intensity transmittance agrees with the theoretical one. Both theoretical and experimental results show that the intensity transmittance and the intensity splitting ratio of the Wollaston-type parallel-splitting polarizing prism fluctuate slightly with the incident angle and the incident wavelength. The included angle of the two beams is not more than 0.42 and maintains a good parallelism when the incident angle is in the range of (-3~3)° or the wavelength in range of 400~1 100 nm.

A new method for the discrimination of adulterated milk based on two-dimensional(2D) correlation infrared spectroscopy and least square support vector machines (LS-SVM) was proposed. 48 pure milk samples were collected and 16 urea-tainted milk (0.01~0.3 g/L), 16 melamine-tainted milk (0.01~0.3 g/L), 16 tetracycline-tainted milk (0.01~0.3 g/L) were prepared. Based on the characteristics of 2D correlation infrared spectra of pure milk and adulterated milk, 6 apparent statistic parameters of all samples were extracted and calculated. These 6 parameters were used as input for LS-SVM to build discriminant model of adulterated milk and pure milk. The recognition rate of unknown samples was 90.6%. The results reveal that parameterization of 2D correlation spectra in combination with LS-SVM method has a feasible potential to discrimination adulterated milk and pure milk.

Autofluorescence characteristics of Basal Cell Carcinoma skin were studied by Monte Carlo method. Based on the microscopic autofluorescence image, an eight-layered optical model of skin Basal Cell Carcinoma was constructed. By Monte Carlo simulation, the light distribution in the model was calculated, and the diffuse reflectance process was modeled in visible wavelength range in order to perfect the multi-layer tissues optics model. Monte Carlo method was used to simulate the tissues reabsorbtion and rescattering effect on intrinsic autofluorescence based on the light-tissue interactions. The escaping process of autofluorescence photons from tissue surface was discussed, and the in vivo autofluoresconce spectra of skin Basal Cell Carcinoma were reconstructed. The results show that the rebuilted skin autofluorescence spectra achieve a good agreement with the experimental results. This study will provide a practical theoretical method to study transmission process of intrinsic autofluorescence in skin cancer lesions, and revealed autofluorescence characteristics of skin cancer.