Multi-soliton generation with extremely narrow free spectrum range for multiplexed sensors via optical network

We propose a new system of multiplexer sensors using the localized soliton pulse generated by a microring resonator in optical networks. A large bandwidth signal is generated by a soliton pulse propagating within the microring resonator, which is allowed to form the multiplexed sensors. Two forms of soliton pulses are generated and localized, i.e. temporal and spatial solitons. The required soliton pulses with specified wavelengths can be localized and formed the sensing. This is formed by using an optical add/drop multiplexer incorporating in the optical network, where the localized soliton pulses are available for add/drop signals to/from the optical network. The change in physical parameter measured the change in soliton wavelength, which formed the measurement.     

Optical wireless quantum communication coding system using decimal convertor

In this study, a system of microring resonators and an add/drop filter are used to generate a large bandwidth signal as a localized multi wavelength, applicable for continuous dense coding and continuous variable encoding generation. This technique uses the Kerr nonlinear type of light in the MRR to generate multi wavelength of bright and dark soliton for quantum network cryptography. Afterwards, generated bright and dark optical pulses are converted into digital logic quantum codes using a decimal convertor system in which transmission of secured information are performed via an optical wireless communication system. Results show that ranges of multi bright and dark soliton wavelengths from 1.45 to $1.65\,\upmu \mathrm{m}$ with central wavelength of $1.55\,\upmu \mathrm{m}$ could be simulated, where the FWHM and FSR of 50 and 1,440 pm are obtained, respectively.     

A novel multi-optical/quantum memory and encoding system using multi-photon generation

We propose a novel system of an optical/quantum memory generation, which can be used for multi-optical/quantum memory applications. The large bandwidth of a single pulse is generated using a soliton pulse in a Kerr-type nonlinear medium, i.e. a nonlinear waveguide. The generation of the localized temporal and spatial soliton pulses within the nano-waveguide is achieved. The free spectrum range enhancement of the generated multi-soliton signals can be formed and achieved using the nano-waveguide incorporating the Mach Zhender Interferometer (MZI). The different light path of the soliton pulses is introduced by the delayed lines of the interferometer. This improves the wavelength free spectrum range, where the different entangled photon pairs can also obtained. Furthermore, the generated photons can be filtered and stored within a system, where the storage of single or multi-photons using the proposed system can be achieved, which in turn can be used for multi-optical/quantum memory applications.     

Continuous variable quantum key distribution via a simultaneous optical-wireless up-down-link system

We propose a remarkably simple system of a continuous variable quantum key distribution using chaotic signals generated by a soliton pulse within a nonlinear micro-ring resonator system. By using the appropriate soliton input power and micro-ring parameters, continuous signals are generated spreading over the spectrum. Polarized photons are formed incorporating the polarization control unit into the micro-ring system, which allows different time slot entangled photons to be randomly formed. Two different frequency bands for up-down-link converters can be selected (filtered) and performed, which is available for the simultaneous up-down-link application in the telephone networks. Results obtained have shown that the application of such a system for continuous variable quantum cryptography via optical-wireless up-down-link converters within a single system is plausible.     

Dark-bright optical solitons conversion via an optical add/drop filter for signals and networks security applications

We propose a new system of the dark-bright solitons conversion using a micro- and nano-ring resonators incorporating an optical add/drop filter, where the add/drop filter can be used to convert the dark soliton to bright soliton. The key advantage of the system is that the detection of the dark soliton pulse is normally difficult due to low level of input power. Firstly, a dark soliton pulse is input into a micro-ring resonator, then propagating into smaller micro- and nano-ring resonators. Secondly, the add/drop filter is applied (connected) into the ring system, where the bright and the dark solitons are obtained via the drop and through (or throughput) the ports of the add/drop filter, respectively. The results obtained have shown that the detected soliton power can be controlled by the input soliton power and the ring resonator coupling coefficient, which is enough to use in the transmission link. The optical and the quantum networks using dark soliton are also discussed.     

QKD and QDC via optical-wireless link for quantum mobile telephone network application

We propose a novel system of the simultaneous continuous variable quantum key distribution (QKD) and quantum dense coding (QDC) using a soliton pulse within the nonlinear micro-ring resonator devices. By using the appropriate soliton input power and nonlinear micro-ring parameters, the continuous signals are generated spreading over the spectrum. The polarized photons are formed by using the polarization control unit incorporating into the micro-ring system, which is allowed the different time slot entangled photon pair randomly formed. Results obtained have shown that the application of such a system for the simultaneous continuous variable quantum cryptography and dense coding within a single system is plausible, which is can be implemented within the mobile telephone hand set and networks.     

A simultaneous generation of QKD and QDC via optical memory array for distributed network security

We propose a novel system of a simultaneous generation of continuous variable quantum key distribution (QKD) and quantum dense coding (QDC) via an optical memory array. The optical memory system is formed by using an array waveguide incorporating a nano-ring resonator, whereas the different spatial light modes can be generated and stored within an optical memory unit. The polarized photon is formed and stored within a storing device, i.e. a ring resonator, whereas the different time slot entangled photons can be generated, transmitted and detected by the different subscriber in the distributed networks. By using the optical memory concept, the continuous variable quantum key distribution is provided. Furthermore, the use of quantum dense coding via time division multiplexing paths, i.e. different time slot, is also plausible. The advantage of the proposed system is that the quantum key distribution can provide the network top security with high capacity and safety, which is the large demand of usage in the public networks.     

Soliton pulses generation and filtering using micro-ring resonators for DWDM-based soliton communication

We propose a new optical system that can be used to form the multi-soliton pulses within the micro-ring resonators. The system consists of two micro-ring resonators and an add/drop multiplexer that can be integrated into a single system. The large bandwidth signal is generated by using a soliton pulse propagating in a Kerr-type nonlinear medium. The tuned soliton pulses in either spatial or temporal modes are obtained by using the add/drop multiplexer. Results obtained have shown that the multi-soliton pulses can be localized coherently within the micro-ring waveguide. This is shown that the generation of the multi-soliton pulses within the micro-ring resonator is achieved, which is available for long-distance communication with dense wavelength division multiplexing (DWDM). The significant increase in channel number and spacing are obtained, whereas the large free spectrum range (FSR) of 600 pm is achieved.     

Optical quantum transmitter with finesse of 30 at 800-nm central wavelength using microring resonators

A microring resonator (MRR) system incorporating an add/drop system is presented. The finesse of the proposed system can be determined using the full width at half maximum (FWHM) and free spectrum range (FSR) of the generated multiple soliton pulses. The central wavelength of the bright input soliton pulse has been selected as 800 nm, at which a ring system with better sensitivity shows high finesse that is suitable for applications to many optical communication systems such as optical transmitters and sensors. Simulation results show that FSR of 0.3 nm and 1.1 ns and FWHM of 10 pm and 36.6 ps could be obtained. Therefore, a system with finesse of 30 can be obtained; in such a system, the MRR system shows high performance. This system can be used in optical communication networks as a transmitter system for optical soliton pulses with finesse of 30, and theses pulses can be detected via an optical receiver.     

Multitweezers generation using dark soliton pulses and applications

Multi-dark soliton pulses have been successfully generated by using forward and backward pumping of the S-band erbium doped fiber in the fiber optic loop, where the Stimulated Brillouin Scattering (SBS) is a nonlinear interaction between pump fields with Stokes field through acoustic wave. Results obtained have shown that the dark soliton trains can be generated and configured as the multi-optical tweezers. The advantage is that the generated tweezers are in the form of dynamic tweezers, where they can transmit/transport via the soliton communication link. The single dark soliton is also experimentally generated by using the different fiber optic scheme. We have also theoretically shown that the dynamic tweezers can be controlled and tuned, which is available for trapping and transportation in the communication link via a wavelength router. The quantum states of the transported atoms/molecules by the dynamic tweezers can be performed by using the quantum processing unit incorporating in the system.     

GHz frequency band soliton generation using integrated ring resonator for WiMAX optical communication

New system of optical soliton signal generation with a high frequency band is presented. Microring resonator can be used to generate soliton signals with high frequency of GHz. These signals can be transmitted via a wireless network system known as WiMAX, which is providing broadband wireless access up to 50 km. The soliton pulses are more stable with less loss during propagation which is good candidate compare to other current optical waves used in optical communication. In this study, soliton pulses with full width at half maximum of 3 MHz and FSR of 85 MHz could be generated using an add/drop filter system which is used to generate high frequency signals, required for wireless network systems. These pulses can be used as carrier signals in order to transmit information codes without significant changes, thus improving transmission quality and delivery of the right information.     

Polarized soliton pulses generation using nonlinear micro ring resonators for multi- and long distance links

We propose a new concept of quantum soliton pulses generation using a soliton pulse in the micro ring resonators. Firstly, the chaotic soliton pulses are generated and circulated within the integrated micro ring resonators. Secondly, the specific second harmonic pulses are selected by using the appropriate ring parameters. The superposition of the second harmonic pulses within the micro ring devices introduces the randomly polarized photons within the micro ring device. The entangled photon visibility of the polarized photon is seen after passing the polarization control devices and projecting on the detectors. The optimum entangled photon visibility is obtained. The advantage of such a system is that the quantum repeater unit can be redundant for long distance quantum communication link, whereas the use of the system for multi-entangled photon sources and links is also available. The system degradation via the entangled photon states timing walk-off is also discussed.     

A novel system for optically localized soliton pulse in a nano-waveguide

We propose a novel optical system that can be used to trap (store) light coherently. The system consists of two micro and a nano-ring resonators that can be integrated into a single system, which can be employed to generate the large bandwidth by a soliton pulse within a Kerr type nonlinear medium. The balance between dispersion and nonlinear lengths of the soliton pulse exhibits the soliton behavior known as self-phase modulation, which introduces the optical output (i.e. gain) constant, which means that light pulse can be trapped, i.e. localized coherently within the nano-waveguide. The time independent soliton pulse is adiabatically localized within the nano-ring device. Results obtained have shown that the trapping of the localized temporal and spatial soliton pulses is achieved.     

An atom/molecule/DNA probing and transportation using dynamic optical tweezers via a wavelength router

A dark soliton pulse beam that has potential applications in the probing and transport of atoms or molecules as an optical tweezers is demonstrated. The trapped pulse beam is formed in the gap between a BP signal at 1500.00 nm and Stokes signal at 1500.09 nm, which has peak powers of −12 dBm. The generated beam is seen to be stable with no fluctuations over a test period of 10 min, which is important to ensure that the transported atom/molecule is not lost in the link media, therefore, the dynamic optical tweezers are now plausible. The theoretical background of the trapped atom/molecule is also analyzed and described in details. The atomic/molecular network via a wavelength router is also described.     

Generalized fast and slow lights using multi-state microring resonators for optical wireless links

We propose an interesting result on fast and slow light generation using nonlinear microring resonators. When a soliton pulse is generated within the first ring resonator, the specific signals can be generated using the chaotic filter characteristics of light pulses travelling within the microring devices. We have demonstrated that two different frequency bands can be generated and they are suitable for use in optical wireless links. The other application of fast and slow lights is also presented, whereas signal security can be formed using the add/drop device to retrieve the original signal from the chaotic noisy signals. The key advantage is that the original signal can be kept in secret without any tapping due to the problem of fast light pulses and noisy signals, which are difficult to intercept.     

Entangled photon states recovery and cloning via the micro ring resonators and an add/drop multiplexer

We propose a new system of the entangled photon generation and recovery using a Gaussian pulse traveling within the nonlinear micro ring resonators, whereas the cloning feasibility of the entangled photon states via an add/drop multiplexer is also proposed. Firstly, the optimum entangled photon visibility is generated by using the Gaussian pulse in the ring resonators, where the second harmonic pulses are generated by filtering the chaotic signals. Secondly, the small amount of the transmission power is coupled by the add/drop device, whereas the entangled photon states, i.e. cloning states, are regenerated by using the polarization control unit. Results obtained have shown that the recovery entangled photon states can be made and confirmed with the initial states, which means that the cloning of entangled photon states of the initial states is plausible. The amplified entangled photon for state recovery is also discussed.     

New WDM bands using a Gaussian pulse within a nano-waveguide

The new optical communication bandwidths (wavelength bands) using a Gaussian pulse propagating within a nonlinear microring resonator system is proposed. The Gaussian input pulses, for instance, when the input pulses of the common lasers with center wavelengths from 400 to 1500 nm are used, the required output wavelength bands can be obtained by controlling the coupling coefficients of the add/drop filter. Results obtained have shown that more available wavelength bands from the different center wavelengths can be generated, which can be used to form new dense wavelength division multiplexing bands. The novelty of the work is that the expansion of communication bands, especially, when the center wavelength is at 1300 nm can be obtained by using a common laser pulse, whereas the amplified and non-dispersive light source can be formed.     

三种结构的光分插复用器特性比对研究

 针对电交换路由成为全光网通信和密集波分复用等高速信息传递网的电子瓶颈的现状,开展对全光光分插复用器的理论和实验研究。介绍了基于Mach-Zehnder干涉仪和FBG结构、基于FBG和光环行器结构以及一体化光纤光栅耦合器结构的光分插复用器的工作原理,实际构建了3种结构的光分插复用器,并分别搭建测试系统进行了单波长光信号上/下行实验研究,对比了这3种光分插复用器结构的性能和优缺点,为全光光分插复用器的设计制作提供了参考。     

一种基于非线性光纤环镜开关特性的超短光孤子产生方法

提出了一种利用非线性光纤环镜的开关特性将连续波同时转化为亮孤子和暗孤子的新方法 ,即让连续波和另一波长的调制脉冲串共同耦合入光纤环镜 ,交叉相位调制使得一部分连续波被环镜透射 ,其余部分被反射 ;再让透射波和反射波分别在反常色散光纤和正常色散光纤中传输 ,自相位调制和群速度色散之间的相互作用使得透射波和反射波分别演化为亮、暗孤子。数值计算表明 ,该方法不仅可产生脉宽比调制脉冲窄、重复频率比调制脉冲高的亮孤子和暗孤子 ,而且几乎可将全部的连续波能量转化为孤子能量。     

Application of WDM holographic devices in access and metro networks

In this paper, a design of a generic multipurpose device is described. It can operate, in its basic structure, as a tunable wavelength filter, wavelength multiplexer or λ router; by using a more complex structure, the device works as an optical add drop multiplexer (OADM) or/and optical switch (OS). It can be used in both coarse and dense wavelength division multiplexing technology (CWDM/DWDM) according to the network application. Performance parameters of the device, like switching time, losses, crosstalk or polarization insensitivity are analyzed and compared with other switching technologies. Some applications of the holographic WDM multifunction device in METRO networks are described, such as the utilization of OADMs in optical path protection/reconfiguration between nodes (1 + 1 configuration) and the use of optical switches to interconnect nodes of the METRO–access network with the METRO-Core or long haul networks in a reconfigurable topology. Other applications in Access networks are possible, like the use of the OADMs in optical path protection between the optical line termination (OLT) at the central office (CO) and the remote node (RN) in a fiber to the office passive-optical network (FTTO-PON) or, in some specific cases, the utilization as tuneable holographic filters in a FTTO application, at the Business ONT (BONT), to select the assigned optical wavelength according to the services provided to the customer.