All-optical Time Division Multiplexing Research Articles

Light slowing and all-optical time division multiplexing of hybrid four-wave mixing signal in nitrogen-vacancy center**Project supported by the National Key Research and Development Program of China (Grant Nos. 2017YFA0303700 and 2018YFA0307500) and the National Natural Science Foundation of China (Grant Nos. 61605154, 11604256, and 11804267).

We report the experimental results of hybrid four-wave mixing and fluorescence signals from nitrogen-vacancy (NV) centers in diamond. The fluorescence signals are slowed owing to dark state. The observed delay time of light slowing due to interconversion between NV− and NV0 is about 6.4 μs. The relative intensities of read-out signals change with the wavelength and power of writing pulse. Based on light slowing, we present the model of all-optical time division multiplexing. The intensity ratio in different demultiplexed channels is modulated by the wavelength and power of control field. It has potential applications in quantum communication and all-optical network.

BER performance analysis of 100 and 200 Gbit∕s all-optical OTDM node using symmetric Mach–Zehnder switches

In future high-speed self-routing photonic networks based on all-optical time division multiplexing (OTDM) it is highly desirable to carry out packet switching, clock recovery and demultiplexing in the optical domain in order to avoid the bottleneck owing to the optoelectronics conversion. We propose a self-routing OTDM node structure composed of an all-optical router and a demultiplexer based on the symmetric Mach–Zehnder (SMZ) for high bit rate OTDM packets. Here, we investigate both numerically and by means of simulation the noise and crosstalk characteristics of the SMZ and the bit error rate (BER) performance of the proposed OTDM node. For BER of 10−9 and the total bit rates of 100 and 200 Gbit/s the power penalty incurred is about 2 and 2.5 dB, respectively compared with a 2.5 Gbit/s back-to-back (B-B) system.

All-optical TDM data demultiplexing at 80 Gb/s with significant timing jitter tolerance using a fiber Bragg grating based rectangular pulse switching technology

We demonstrate the use of fiber Bragg grating based pulse-shaping technology to provide timing jitter tolerant data demultiplexing in an 80 Gb/s all-optical time division multiplexing (OTDM) system. Error-free demultiplexing operation is achieved with /spl sim/6 ps timing jitter tolerance using superstructured fiber Bragg grating based 1.7 ps soliton to 10 ps rectangular pulse conversion at the switching pulse input to a nonlinear optical loop mirror (NOLM) demultiplexer comprising highly nonlinear dispersion shifted fiber (HNLF). A 2-dB power-penalty improvement is obtained compared to demultiplexing without the pulse-shaping grating.

Algorithms for supporting compiled communication

We investigate the compiler algorithms to support compiled communication in multiprocessor environments and study the benefits of compiled communication, assuming that the underlying network is an all-optical time-division-multiplexing (TDM) network. We present an experimental compiler, E-SUIF, that supports compiled communication for High Performance Fortran (HPF) like programs on all-optical TDM networks, and describe and evaluate the compiler algorithms used in E-SUIF. We further demonstrate the effectiveness of compiled communication on all-optical TDM networks by comparing the performance of compiled communication with that of a traditional communication method using a number of application programs.

Scheduling algorithms for multicast traffic in TDM/WDM networks with arbitrary tuning latencies

We consider all-optical Time Division Multiplexing (TDM)/Wavelength Division Multiplexing (WDM) broadcast and select networks with slotted operation. Each network access node is equipped with one fixed transmitter and one tunable receiver; tuning times are not negligible with respect to the fixed size slot time. We discuss efficient scheduling algorithms to assign TDM/WDM slots to multicast traffic in such networks. The problem is shown to be NP-hard; thus, heuristic algorithms based on the Tabu Search meta-heuristic are proposed, and their performance are assessed using randomly created request matrices based on two types of multicast traffic patterns. We show that significant advantages can be obtained by using these novel algorithms with respect to simpler greedy algorithms, even when restricting CPU times to realistic values to make the algorithms of practical use.

PLC hybrid integration technology and its application to photonic components

Silica-based planar lightwave circuit (PLC) hybrid integration is a promising way to provide highly functional photonic components. This paper is an overview of recent progress in PLC hybrid integration technology including optoelectronic semiconductor devices for the hybrid integration, various devices for wavelength-division multiplexing, and all-optical time-division multiplexing.

All-optical time-division-multiplexing of 100 Gbit/s signal based on four-wave mixing in a travelling-wave semiconductor laser amplifier

All-optical time-division multiplexing is experimentally demonstrated using four-wave mixing in a semiconductor laser amplifier. A 100 GHz, 1.562 /spl mu/m signal is modified by 10 Gbit/s signals to generate 1.552 /spl mu/m subchannels in a 100 Gbit/s signal and its error free operation is confirmed.

All-optical time division multiplexing using four-wave mixing

A new approach to all-optical time-division multiplexing is proposed and experimentally demonstrated. A 100 GHz 1.547 mu m signal is modified by time-delayed 6.3 Gbit/s signals to generate subchannels in a 1.557 mu m 100 Gbit/s signal via four-wave mixing.

All-optical TDM to WDM conversion in a semiconductor optical amplifier

The authors report the first demonstration of all-optical time division multiplexing (TDM) to wavelength division multiplexing (WDM) conversion based on four-wave mixing in semiconductor optical amplifier. A 700 Mbit/s TDM bit stream at one wavelength has been converted to two 350 Mbit/s WDM bit streams at two wavelengths spaced by 4 nm. Observed bit error rates are less than 10/sup -9/. >