Journals >Chinese Journal of Quantum Electronics
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2011
Volume: 28 Issue 6
20 Article(s)
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Research Article
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[in Chinese]
Chinese Journal of Quantum Electronics
- Publication Date: Jan. 01, 1900
- Vol. 28, Issue 6, 1 (2011)
Principle, key technologies and applications of optical orthogonal frequency division multiplexing communication system
Hong-xi YIN, and Yi-ming WANG
Optical orthogonal frequency division multiplexing(O-OFDM) technology is a novel optical communication technology which combines electrical OFDM technology and optical fiber communication technology. O-OFDM will be widely employed in the large-capacity and long-haul fiber-optic communication systems and optical access Optical orthogonal frequency division multiplexing(O-OFDM) technology is a novel optical communication technology which combines electrical OFDM technology and optical fiber communication technology. O-OFDM will be widely employed in the large-capacity and long-haul fiber-optic communication systems and optical access networks because of its high frequency efficiency, effective resistance to the chromatic dispersion, polarization-mode-dispersion and non-linear effects. The principles, structures and key technologies for O-OFDM at home and abroad are introduced. The technologies and theoretical problems to be studied for O-OFDM applications are discussed and moreover, the future development trends and application prospects of O-OFDM technologies are penetrated..
Chinese Journal of Quantum Electronics
- Publication Date: Jan. 01, 1900
- Vol. 28, Issue 6, 641 (2011)
A review of relationship between human meridians and nervous system
Chang-shui CHEN, Yi-fan JIANG, Gui-fang FU, and Song-hao LIU
Meridian and nervous system have a close relationship, and there are many researchers in this field. The recent achievements in this field are mainly recapitulated, evaluated and its prospect is viewed. A new method of optics is presented for the subject.Meridian and nervous system have a close relationship, and there are many researchers in this field. The recent achievements in this field are mainly recapitulated, evaluated and its prospect is viewed. A new method of optics is presented for the subject..
Chinese Journal of Quantum Electronics
- Publication Date: Jan. 01, 1900
- Vol. 28, Issue 6, 648 (2011)
Impact of CCD signal quality related to sampling digit and diaphragm
Xu-ping WU, Ren-min YUAN, Chao LU, and Tao LUO
Sensors like CCD used to record two-dimensional information have many applications in scientific researches. The sampling digit of CCD is a very important index related to the signal quality, price and data transmission speed. The aperture-coefficient of CCD is also an important factor which could influence the signal Sensors like CCD used to record two-dimensional information have many applications in scientific researches. The sampling digit of CCD is a very important index related to the signal quality, price and data transmission speed. The aperture-coefficient of CCD is also an important factor which could influence the signal quality. Using numerical simulation method, the sampling digit and diaphragm are discussed based on aspects of standard deviation and power spectrum, and the best CCD work-state diagram is achieved. The results show that 4-bit and 6-bit CCD could easily produce a large signal distortion, while 8-bit CCD only with proper operation can have the same effect as 12-bit CCD to reflect the real signals without signal distortion. The optimal CCD work-state diagram derived from the simulation results, provides certain theoretical guidance for data acquisition using CCD and has some practical significance..
Chinese Journal of Quantum Electronics
- Publication Date: Jan. 01, 1900
- Vol. 28, Issue 6, 654 (2011)
Research on models of open quantum system interacted with bath
Jie YANG, and Shuang CONG
Based on the exact non-Markovian system dynamic equation about the reduced density matrix of quantum system, which is a non-closed, unequal in time, integral-differential equation, a closed, equal in time, differential Markovian master equation was derived about the reduced density matrix of quantum system by means of Based on the exact non-Markovian system dynamic equation about the reduced density matrix of quantum system, which is a non-closed, unequal in time, integral-differential equation, a closed, equal in time, differential Markovian master equation was derived about the reduced density matrix of quantum system by means of Born approximation and Markov approximation. The Lindblad form of the Markovian master equation, GKS expression for the convenience of testing positivity, Bloch sphere expression for single qubit system, Kraus expression describing dissipative quantum system without specific information of environment were analyzed respectively. Four kinds of Markov approximations that can remove the non-Markovian property were compared. The post-Markovian master equation was analyzed that can meet the perfect requirements of dissipative dynamic when the Markov approximation is not suitable to the open quantum system. When energy exchange existed between the heat bath and quantum system, and the total system composed of the bath and the quantum system has a conservation of energy, the dynamic equation of open quantum system was presented when the bath does not have a constant state, and the Markovian master equation was derived by the Markov approximation..
Chinese Journal of Quantum Electronics
- Publication Date: Jan. 01, 1900
- Vol. 28, Issue 6, 660 (2011)
Solving generalized Burgers equation with variable coefficients by (G′/G)-expansion method
Jing PANG, Ling-hua JIN, and Xiao-mei YING
In recent years, nonlinear evolution equations with variable coefficients received more and more attention. (G′/G)-expansion method, a new method put forward by Wang Ming-liang et al in 2008 was applied to the nonlinear evolution equations with variable coefficients for the first time. The generalized Burgers equation In recent years, nonlinear evolution equations with variable coefficients received more and more attention. (G′/G)-expansion method, a new method put forward by Wang Ming-liang et al in 2008 was applied to the nonlinear evolution equations with variable coefficients for the first time. The generalized Burgers equation with variable coefficient was taken as an example, and new exact solutions were obtained successfully when the coefficient meet the controlled conditions. When this expansion method was improved, the new solution of generalized Burgers equation with variable coefficients can be obtained successfully once again. It is proved that this expansion method is not only easy when solving nonlinear evolution equations with constant coefficients but also very efficient, concise and practical when solving the nonlinear evolution equations with variable coefficients, and it also has a broad application..
Chinese Journal of Quantum Electronics
- Publication Date: Jan. 01, 1900
- Vol. 28, Issue 6, 674 (2011)
Frequency stabilization of 480 nm laser using two-photon DAVLL
Peng XU, Xi CHEN, Jin WANG, and Ming-sheng ZHAN
Frequency stabilization of a diode laser at 480 nm is crucial for coherently exciting rubidium atoms to Rydberg states. A laser frequency stabilization technique is reported based on electromagnetically induced transparency in a ladder configuration with a polarization spectrum stabilized 780 nm diode laser as the probFrequency stabilization of a diode laser at 480 nm is crucial for coherently exciting rubidium atoms to Rydberg states. A laser frequency stabilization technique is reported based on electromagnetically induced transparency in a ladder configuration with a polarization spectrum stabilized 780 nm diode laser as the probe laser and a 480 nm laser as the coupling laser. With a uniform magnetic field, a two-photon dichroic atomic vapor laser lock (DAVLL) spectroscopy was generated. Then this spectroscopy was fed back through two proportion-integral-differential circuits to lock the 480 nm diode laser. A combined linewidth of about 1 MHz is achieved during the locking period..
Chinese Journal of Quantum Electronics
- Publication Date: Jan. 01, 1900
- Vol. 28, Issue 6, 682 (2011)
Quantum communication based on cluster state
Dong WANG, and Xin-wei ZHA
Cluster state quantum dialogue is proposed, which enables both legitimate parties to exchange their 4 bit secret messages in a direct way. Compared with the there-particle W states, the shemes have following advantages. After two-step security check, four-bit secret message can be transmitted to each other by transmittCluster state quantum dialogue is proposed, which enables both legitimate parties to exchange their 4 bit secret messages in a direct way. Compared with the there-particle W states, the shemes have following advantages. After two-step security check, four-bit secret message can be transmitted to each other by transmitting of single particle with the aid of two-bit classical information. The scheme can discard the drawback of the intercept-resend attack, the entangle-measure attack, and the optimal incoherent attack..
Chinese Journal of Quantum Electronics
- Publication Date: Jan. 01, 1900
- Vol. 28, Issue 6, 687 (2011)
Quantum information splitting of product state of single-qubit state via GHZ states
Man-lan LI, and Liu YE
A scheme is proposed for quantum information splitting (QIS) of a product state of an arbitrary single-qubit state with three-qubit GHZ states. The scheme focuses on a product state of an arbitrary single-qubit state, and the original state can be reconstructed only if the receivers cooperate with each other. Every recA scheme is proposed for quantum information splitting (QIS) of a product state of an arbitrary single-qubit state with three-qubit GHZ states. The scheme focuses on a product state of an arbitrary single-qubit state, and the original state can be reconstructed only if the receivers cooperate with each other. Every receiver has the same authority for getting the sender’s secret, and the receivers have the same probability to get the original secret, the probability to gain |φa| is obtained as 2|βb|2, the probability to gain |φb| is obtained as 2|βa|2..
Chinese Journal of Quantum Electronics
- Publication Date: Jan. 01, 1900
- Vol. 28, Issue 6, 693 (2011)
Field entropy properties of coupled identical V-type three-level atoms interacting with vacuum field in cavity filled with Kerr-like medium
Ke LI, Wei-jun LING, and Zhi-jian WANG
The entropy properties of field in the system of coupled identical V-type three-level atoms interacting with vacuum field in cavity filled with Kerr-like medium are studied by means of quantum theory. The time evolution of entropy of field via the initial state of the atomic system, coupling coefficient between the atoThe entropy properties of field in the system of coupled identical V-type three-level atoms interacting with vacuum field in cavity filled with Kerr-like medium are studied by means of quantum theory. The time evolution of entropy of field via the initial state of the atomic system, coupling coefficient between the atoms and Kerr coefficient are discussed. Numerical calculation results show that when the ground state and excited state of atoms are in appropriate superpositions state, the entropy of field is behaving periodic oscillation. The oscillation frequency and amplitude are depending on the coupling constant between atoms and the third-order nonlinear coefficient of Kerr-like medium. Therefore, the entropy of field is very sensitive to the atomic initial state..
Chinese Journal of Quantum Electronics
- Publication Date: Jan. 01, 1900
- Vol. 28, Issue 6, 699 (2011)
Decoherence in two-state quantun systems through an external controllable driving field without rotating wave approximation
Cheng-qiang ZHANG, Chang-jian JI, Meng LIU, Xia TAN, and Hua LI
The problem of decoherence of two-state quantum systems interacting with a bath through an external controllable driving field without rotating wave approximation is discussed. The off-diagonal elements of density operator in two-state quantum systems are obtained. The result reflects that decoherence of the two-state The problem of decoherence of two-state quantum systems interacting with a bath through an external controllable driving field without rotating wave approximation is discussed. The off-diagonal elements of density operator in two-state quantum systems are obtained. The result reflects that decoherence of the two-state quantum systems has something to do with its original state, frequency of the bath and external controllable driving field. The relation between the decoherence and external controllable driving field is studied. Properties of an external controllable driving field are obtained when the two-state quantum systems of coherence is maintained..
Chinese Journal of Quantum Electronics
- Publication Date: Jan. 01, 1900
- Vol. 28, Issue 6, 705 (2011)
A digital secure communication scheme based on generalized synchronization of non-autonomous chaotic system
Bi-rong XU
The generalized synchronization (GS) of Duffing system is investigated, then a digital secure communication scheme based on the generalized chaotic synchronization is proposed. The binary messages to be transmitted are firstly modulated by FSK modulation, then the FSK signals drive non-autonomous chaotic system to tranThe generalized synchronization (GS) of Duffing system is investigated, then a digital secure communication scheme based on the generalized chaotic synchronization is proposed. The binary messages to be transmitted are firstly modulated by FSK modulation, then the FSK signals drive non-autonomous chaotic system to transmit chaotic signals. In the receiver, the binary messages can be recovered when the chaotic systems achieve generalized synchronization. Simulation results show effectiveness of the scheme..
Chinese Journal of Quantum Electronics
- Publication Date: Jan. 01, 1900
- Vol. 28, Issue 6, 710 (2011)
Optical transmission of human small intestine meridian and surrounding non-meridian tissue
Zheng-fa HU, Xiong-ting WANG, Wei ZHANG, Li LUO, Yi-fan JIANG, Xin DENG, Chang-shui CHEN, and Song-hao LIU
A non-destructive method is used to measure the emitted degrees of the diffuse light along the small intestine meridian and surrounding non-meridian tissue. The attenuation of the diffuse light was analyzed at different time within a day. The experimental results revealed that intensity of the diffuse light decay folloA non-destructive method is used to measure the emitted degrees of the diffuse light along the small intestine meridian and surrounding non-meridian tissue. The attenuation of the diffuse light was analyzed at different time within a day. The experimental results revealed that intensity of the diffuse light decay following the exponential decay law with the 808nm light wave as probe when propagating along the small intestine meridian or non-meridian direction, existing the statistical feature in attenuation. Due to the temporal variation of the difference of attenuation of diffuse light, the rate of decay along the small intestine meridian is up to the highest at 12:00, being in accord with the blood running time of the small intestine meridian. This kind of experiment offered the reference to the Qi-blood transportation and the existence of human meridians..
Chinese Journal of Quantum Electronics
- Publication Date: Jan. 01, 1900
- Vol. 28, Issue 6, 715 (2011)
H2 S monitoring system in natural gas desulfurization based on laser absorption spectroscopy
Dian-qiang YU, Jin-ting DONG, Li-ming WANG, Shuai ZHANG, Li CHEN, Ying HE, and Yu-jun ZHANG
It is essential to monitor continuously the concentration of H2 S in the procedure of natural gas desulfurization. The design of monitoring system based on the laser absorption spectroscopy to measure H2 S in desulfurization was presented. In order to realize high sensitive measurement, the compact Herriot multi reflecIt is essential to monitor continuously the concentration of H2 S in the procedure of natural gas desulfurization. The design of monitoring system based on the laser absorption spectroscopy to measure H2 S in desulfurization was presented. In order to realize high sensitive measurement, the compact Herriot multi reflection gas absorption cell was developed, which is placed near the desulfurization tower. The detection system is characterized by signal of detector transferred directly to the analysis room. The experiments were carried out in the gas gathering station in Shandong Province. The results show that the detection limit is 300 ppb and the operation is stable and reliable. All the results demonstrate that the system satisfies the demand of monitoring H2 S in the procedure of natural gas desulfurization..
Chinese Journal of Quantum Electronics
- Publication Date: Jan. 01, 1900
- Vol. 28, Issue 6, 720 (2011)
Concentration detecting system of CO2 based on thermoelectric effect
Xiao-ning CHEN, Jian-guo LIU, Qing YAN, Qiang WANG, Xue-ping HUANG, and Yan-chang ZHANG
Based on the characteristic absorption spectrum of CO2 at 4.26 μm, a micro gas detection system of CO2 concentration is designed with the hermetic extractive White cell and thermoelectric sensor. Practical measurement was carried out and the concentration of CO2 were retrieved. Correlation coefficient and detection limBased on the characteristic absorption spectrum of CO2 at 4.26 μm, a micro gas detection system of CO2 concentration is designed with the hermetic extractive White cell and thermoelectric sensor. Practical measurement was carried out and the concentration of CO2 were retrieved. Correlation coefficient and detection limit can reach 0.99973 and 1 ppm, respectively. The system has simple structure and runs stably. It can avoid the complex structure of the optical disk modulation method, and reduce the instability impacts on detector due to its open structure..
Chinese Journal of Quantum Electronics
- Publication Date: Jan. 01, 1900
- Vol. 28, Issue 6, 726 (2011)
Control of substrate reflectivity in hyper numerical aperture lithography
Yuan ZHOU, An-ling LIU, and Guang-can LIU
Substrate reflectivity needs to be controled to reduce the impact of thin-film interference on lithography performance in hyper numerical aperture (NA) lithography. Based on thin film optics method, the control of substrate reflectivity with bottom antireflection coating (BARC) was investigated for hyper-NA lithographySubstrate reflectivity needs to be controled to reduce the impact of thin-film interference on lithography performance in hyper numerical aperture (NA) lithography. Based on thin film optics method, the control of substrate reflectivity with bottom antireflection coating (BARC) was investigated for hyper-NA lithography. Single-layer and dual-layer BARC on a silicon substrate were optimized to investigate the margins of BARC’s optical parameters which meet the requirements of hyper-NA lithography. It is found that single-layer BARC fails to control substrate reflectivity when NA is more than 0.8 and dual-layer BARCs become essential. The substrate reflectivity of TE wave is more uncontrollable as compared to TM wave. The optimized values of refractive index for single-layer BARC grow as the NA increases. In a dual-BARC structure, the top layer should be low absorptive while the bottom one should be high absorptive. It provides theory base for the research of BARC materials and the control of substrate reflectivity in hyper-NA lithography..
Chinese Journal of Quantum Electronics
- Publication Date: Jan. 01, 1900
- Vol. 28, Issue 6, 730 (2011)
Photoelectric properties of 4H-SiC UV photodetector at various temperatures
Yun-zhe ZHENG, Bing-jin LIN, Ming-kun ZHANG, Jia-fa CAI, Xia-ping CHEN, and Zheng-yun WU
The dark current and relative spectral response of 4H-SiC ultraviolet p-i-n photodetector were investigated with the temperature decreasing from 300 K to 60 K by photocurrent measurement. It is found that the dark current and relative spectral response of the device declined during the whole period and that the higher The dark current and relative spectral response of 4H-SiC ultraviolet p-i-n photodetector were investigated with the temperature decreasing from 300 K to 60 K by photocurrent measurement. It is found that the dark current and relative spectral response of the device declined during the whole period and that the higher the reverse bias voltage is, the faster the falling rate of dark current are. At the reverse bias of 0 V, when the temperature dropped, the peak response wavelength of the device firstly shifted slowly to the short wavelength direction and then moved to the opposite direction, reaching around 282 nm at 60 K. Meanwhile, a littie narrowing of relative spectral response of the device was observed. Furthermore, the mechanism of influences of temperature on photocurrent produced in p, i, n layers were investigated, and proposal lessening defect in i layer and reducing properly doping concentration in n layer were proposed to enhance the relative spectral response of the device..
Chinese Journal of Quantum Electronics
- Publication Date: Jan. 01, 1900
- Vol. 28, Issue 6, 737 (2011)
Optimal simulation of parameters for multiplication layer of 4H-SiC avalanche photodiode
Lin-ying ZHONG, Rong-dun HONG, BO-jin LIN, Jia-fa CAI, Xia-ping CHEN, and Zheng-yun WU
A separate absorption and multiplication (SAM) 4H-SiC avalanche photodiode(APD) was designed by using the simulation software of ATLAS. The influences of various thicknesses and doping concentrations of epitaxial layers on spectral response were analysed, and the parameters of multiplication layer were optimal simulateA separate absorption and multiplication (SAM) 4H-SiC avalanche photodiode(APD) was designed by using the simulation software of ATLAS. The influences of various thicknesses and doping concentrations of epitaxial layers on spectral response were analysed, and the parameters of multiplication layer were optimal simulated. Then the optimal thickness of 0.26 μm and doping concentration of 9.0×1017 cm-3 for multiplication layer were obtained. The simulation results showed that the APD exhibited low breakdown voltage of －66.4 V with high gain of 105. At the bias of 0 V, the peak responsivity was about 0.11 A/W and the corresponding quantum efficiency was 58%. The UV-to-visible rejection ratio of 1.5×103 close to the breakdown voltage and the maximum spectral detectivity about 1.5×1016 cmHz1/2W-1 were also achieved. The above results indicated that the APD had a good performance for UV signal detection..
Chinese Journal of Quantum Electronics
- Publication Date: Jan. 01, 1900
- Vol. 28, Issue 6, 742 (2011)
Influence of magnetic field on properties of excited state of bound polaron in quantum wires
Zhao-hua DING, Li SU, and Rui HE
With Huybrenchts’s linear combination operator and the Lee-Low-Pines(LLP) transformation methods, properties of excited state of strong-coupling magnetopolaron in parabolic quantum wires are studied. The relations of the first internal excited energy, excitation energy and vibration frequency in parabolic quantum wiresWith Huybrenchts’s linear combination operator and the Lee-Low-Pines(LLP) transformation methods, properties of excited state of strong-coupling magnetopolaron in parabolic quantum wires are studied. The relations of the first internal excited energy, excitation energy and vibration frequency in parabolic quantum wires with the Coulomb bound potential, confinement strength and cyclotron frequency are presented. The numerical results indicate that the first internal excited energy, excitation energy and vibration frequency increase with increasing of confinement strength and the cyclotron frequency. The excitation energy and vibration frequency are increasing functions of the Coulomb bound potential, and the first internal excited energy decreases with increasing of the Coulomb bound potential..
Chinese Journal of Quantum Electronics
- Publication Date: Jan. 01, 1900
- Vol. 28, Issue 6, 748 (2011)
A novel multi-mode interference photonic crystal wavelength division demultiplexer
Xuan ZHANG, Qing-hua LIAO, Tian-bao YU, and Nian-hua LIU
A novel wavelength division demultiplexer (WDDM) based on the multi-mode interference effect (MMI) in 2D photonic crystal is presented, and it can separate three wavelengths effectively. This device takes 1310 nm/1500 nm/1550 nm for example here, and it can be extended to other wavelengths by changing the structure parA novel wavelength division demultiplexer (WDDM) based on the multi-mode interference effect (MMI) in 2D photonic crystal is presented, and it can separate three wavelengths effectively. This device takes 1310 nm/1500 nm/1550 nm for example here, and it can be extended to other wavelengths by changing the structure parameters. In addition, it can be also used to realize the separation for 1310 nm/1550 nm alone. The structure of WDDM composes of three MMI regions, which can make two wavelengths get through and one wavelength reflect back. The transmissions are above 91%. At the same time, by virtue of the plane wave expansion (PWE) and finite-difference time-domain method (FDTD), we simulate the performance..
Chinese Journal of Quantum Electronics
- Publication Date: Jan. 01, 1900
- Vol. 28, Issue 6, 753 (2011)
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