Peida Ye

Analysis of photonic frequency upconversion for radio-on-fiber applications using two-pump four-wave mixing in semiconductor optical amplifiers

A novel scheme of photonic frequency conversion based on two-pump four-wave mixing in a semiconductor optical amplifier is proposed. Characterized by its wide conversion range, the proposed scheme has the potential to generate millimeter waves at much higher frequency and convert several signal channels simultaneously. The system performance is analyzed through a numerical model, and the effect of the pump-signal pulse parameters on the conversion efficiency is discussed.

Numerical modeling and experimental testing of reflective semiconductor optical amplifier (RSOA) with modulation bandwidth optimization

A numerical model for RSOA including spatial variations of carrier density and ASE noise, is established and validated via experimental tests. Performance of RSOA with different cross-sectional areas of active region is investigated in the simulations. Reducing the cross-sectional area can increase its modulation bandwidth.

Polarization independent 4-stage OTDM multiplexer using plated GRIN lens

In this paper, a 4-stage optical time domain multiplexing (OTDM) multiplexer based on plated graded index (GRIN) lens is proposed and experimentally demonstrated. A 10Gbit/s return-to-zero (RZ) signal is upgraded to 160Gbit/s. The time-domain accuracy of the multiplexer is evaluated by analyzing the multiplexed 160Gbit/s signal. Experimental results validate the stability of the optical multiplexing behavior and the polarization insensitivity of the proposed multiplexer. The results also show the advantages of our OTDM multiplexer such as the flexible output signal speeds at the output of different stages, the low insertion loss and the temperature and wavelength stability.

A novel approach of header extraction for optical unslotted networks using SOA-MZI with differential modulation scheme

A novel serial scheme of header extraction for optical unslotted networks using SOA-MZI with differential modulation scheme was proposed in this paper for the first time. Numerical analysis and simulation show, that more than 15dB contrast ratio of the separated header at 2.5Gbit/s to the suppressed payload at 40Gbit/s could be achieved. In addition, the SOA-MZI parameters are discussed and designed to optimize the performance of the proposed scheme.

Performance analysis and optimization design: photonic millimeter-wave signal generation using nondegenerate four-wave mixing in semiconductor optical amplifier and distribution over fiber

Photonic millimeter wave (mm-wave) signal generation employing a differential Mach-Zehnder modulator (DMZM) and a semiconductor optical amplifier (SOA) is proposed and evaluated by theoretical analysis and simulation. This paper presents the theoretical study of the generation of a co-polarized and phase-locked dual-pump for four-wave mixing and optical mm-wave signal, the propagation of the optical mm-wave signal in single mode fiber, and the coherent demodulation of the electrical mm-wave signal at the base station. Performance analysis and optimization design of the proposed scheme are conducted via simulations. The generation of mm-wave signals at 30, 40, and 60 GHz is simulated and analyzed. The influence of SOA and the input optical signal on the mm-wave generation and transmission is investigated. Simulation results present useful insight for the practicality of photonic mm-wave signal generation and distribution in the next-generation access network.

Design and analysis of flexible colorless remote node using RSOA-assisted Michelson interferometer

A scheme of flexible colorless remote note with reflective semiconductor optical amplifier (RSOA) assisted Michelson interferometer is proposed. This is capable of generating an optical carrier suppressed signal at a specific radio frequency to suppress the penalty brought about by Rayleigh backscattering and reflection in a full-duplex single fiber transmission network. Simulations are conducted, and the validation of the proposal is discussed by observing the penalty eye opening factor. The results are useful for designing cost-effective multi-wavelength passive optical network (PON) or radio-over-fiber (RoF) systems.

Traffic shaping at the edge node in synchronous optical packet-switched networks

Long-range dependence, short-range dependence and marginal distribution are three key statistical features for incoming traffic, which have a serious impact on network performance. This paper respectively, studies their characteristics during traffic shaping at the edge node in synchronous optical packet-switched networks and highlights the functions of the First-Come-First- Service (FCFS) schedule queue for various offered loads and assembly parameters, including normalized timeout and normalized threshold. Simulation results demonstrate that under light-medium load the FCFS schedule queue works as a low pass filter, i.e., the statistical features before and after the FCFS schedule queue is nearly the same and each of the statistical features approximately follows the same trend. Heavy load drives the FCFS schedule queue into an overload or saturation state and the three statistical features all exhibit different behavior. By adjusting the assembly parameters, the deficiency can be modified.

Novel header extraction for optical packet-switched networks using a modified terahertz optical asymmetric demultiplexer with differential modulation scheme

A novel scheme of header extraction for optical packet switched networks is proposed for the first time. The system is based on a modified terahertz optical asymmetric demultiplexer (TOAD) with a differential modulation scheme. Numerical analysis and simulation show that more than 15-dB contrast ratio of the separated header at 2.5 Gbit/s to the suppressed payload at 40 Gbit/s can be achieved. In addition, the semiconductor optical amplifier (SOA) TOAD parameters are discussed and designed to optimize the performance of the proposed scheme.

Comparison study of length-threshold, timer-based and hybrid algorithm for optical packet assembly

Optical packet-switched networks (OPNs), which consist of edge nodes and core nodes, are regarded as one of the most promising solutions to meet the increasing service requirements of the global Internet and to utilize efficiently the huge bandwidth of dense wavelength division multiplexing (DWDM) technology. In particular, the edge nodes perform adaptation function which interfaces between the legacy packet networks (i.e. IP networks) and OPNs. Namely, the edge nodes assembly IP packets from electronic layer into a larger optical packet. The function of packet assembly has become an important issue to be addressed in OPNs, since it not only increases the bandwidth utilization, but also reduces the self-similarity of the traffic. Studied in this paper are three kinds of typical packet assembly schemes in unslotted OPNs, i.e. the timer-based one, the length-threshold one and the hybrid algorithm. Based on a generic architecture of the edge nodes, these assembly mechanisms are examined by simulations under various self-similar traffic loads. The impacts of these algorithms on the traffic, including statistics of generated optical packets and self-similarity of optical packet traffic, are compared. The simulation results indicate that optical packet assembly can fulfill traffic shaping by improving key traffic characteristics of interest in network performance evaluation, such as the long-term correlation and so on. Moreover, the hybrid algorithm proves to be a better solution when both the assembly time and the packetisation efficiency have been also considered at the same time.

Ultrafast all-optical logic XOR using SOA-MZI with differential modulation scheme

In this paper, the all-optical logic exclusive OR using integrated SOA-based Mach-Zehnder interferometer with differential modulation scheme is proved to exceed the operation speed limit of the logic XOR with original modulation effectively through numerical analysis for the first time. The SOA Parameters, the signal parameters and the time delay are discussed and designed to optimize the switching performance of the proposed logic XOR. The operation of the proposed logic XOR with 80Gb/s RZ pseudorandom bit sequences is simulated with fairly high performance.