Kyosuke Sone

A compact and lossless 8 × 8 SOA gate switch subsystem for WDM optical packet interconnections

We developed a compact 8 times 8 gate switch subsystem, which was integrated with eight 8:1 SOA modules (72-SOAs). We achieved a high-speed switching, lossless and colored operation.

Field trial of data-granularity-flexible reconfigurable OADM with wavelength-packet-selective switch

Reconfigurable optical add/drop multiplexers (ROADMs), which enable dynamic and flexible node-to-node connection via wavelength paths, are key components in metro ring network nodes. A data-granularity-flexible ROADM node that combines a wavelength-tunable filter, and an optical packet ADM (PADM) has been proposed and demonstrated. In this paper, the first field trial of the data-granularity-flexible ROADM network with wavelength- and packet-selective switch is demonstrated using a novel concurrent generation technique of address-reconfigurable optical-code (OC) labels and payload data. Bit error rates (BERs) of less than 10/sup -12/ for all 16-wavelength channels are obtained over 90 km of transmission at 10 Gb/s.

Field Trial of 640-Gbit/s-Throughput, Granularity-Flexible Optical Network Using Packet-Selective ROADM Prototype

Reconfigurable optical add/drop multiplexers (ROADMs) are able to provide flexible wavelength path provisioning in wavelength division multiplexing (WDM) networks. However, the capability of conventional ROADMs is limited to handling wavelength paths, and it does not support fine granularity in add/drop multiplexing of packets. Recently, we have proposed and demonstrated a packet-selective ROADM that combines an acoustooptic wavelength-tunable filter (AOTF) and an optical packet ADM (PADM) using optical code label processing. It provides more efficient utilization of wavelengths than conventional ROADMs. However, the bit rate of the demonstration was limited up to 10 Gbit/s. In this paper, we newly develop a label-selectivity-enhanced optical en/decoder, which allows the optical label recognition with 40-Gbit/s nonreturn-to-zero (NRZ) data packets, and a wide pass-band AOTF for 40-Gbit/s signals. Furthermore, we develop 640-Gbit/s throughput, packet-selective ROADM prototype, and demonstrate a field trial of granularity-flexible 3-node optical network over 173 km. error-free packet ADMs (error rate of under 10-12) for all 16-wavelength channels at all nodes are obtained.

High-speed and High-reliability Optical Selector for 256×256 Large-scale, Nanosecond-order Optical Switching

We have developed a high-performance 8-input and 1-output optical selector for 256×256-ports optical switching systems. This optical selector provides compactness and high reliability as well as high-speed switching of a few nanoseconds.

Novel Optical Coupling Technique for Enhancing the Performance of Integrated 8-Input/1-Output SOA Gate-Switch Module

We developed 8-input/1-output (8:1) optical gate- switch module that is compact and reliable by proposing and developing a novel lens coupling scheme suitable for an 8:1 integrated SOA device for a multigate semiconductor optical amplifier (MG-SOA) switch system. We first designed special lenses that collect the tilted SOA beams and simultaneously magnify the pitch and beam size, and we fabricated a highly reliable optical module with hermetic sealing and laser-welded joints. The module exhibits low-loss coupling (~ 3.1 dB), high channel crosstalk (~ - 50 dB), high extinction ratio (>81 dB), and high-speed switching (~ 2.5 ns), confirming that this module is applicable to MG-SOA switching systems.

Compact photonic gateway for dynamic path control using acousto-optic tunable filter

A compact photonic gateway for wavelength-path control with a simple configuration at low cost was developed. The gateway achieves wavelength-path control by using acousto-optic tunable filters (AOTF). The fabricated four-channel integrated AOTF device exhibits a high performance with regard to polarization-independent characteristics, side-lobe suppression, higher extinction ratio, and narrower bandwidth for 100 GHz spacing. An AOTF subsystem was fabricated by combining an AOTF with the control circuit to exploit the AOTFs high-speed switching to the full and operate it stably for practical use and achieve stable operation of the AOTF. We manufactured the photonic gateway node by assembling the AOTF subsystem with the provisioning control and redundant system.

Evaluation of FSK light labels superimposed on 112 Gbps DP-QPSK signal with real-time coherent receiver and optical filter based decoder for light path tracing

We experimentally evaluate the feasibility of FSK light labels superimposed on 112 Gbps DP-QPSK signals using real time digital coherent receiver and optical filter based light label decoder.

Experimental investigation on nonlinear distortions with perturbation back-propagation algorithm in 224 Gb/s DP-16QAM transmission

We investigate the impact of perturbation back-propagation algorithm on distribution of nonlinear noise in 224 Gb/s DP-16QAM transmission over large-Aeff pure silica core fiber and show the distribution approaches to Gaussian by the nonlinear compensation.

High-speed SOA Gate switch driver with equal-length wiring and peaking techniques

We developed a high-speed SOA gate-switch driver using an equal-length wiring technique. It can drive two SOAs simultaneously at 300 mA with a rising time of 2.5 ns for high-speed and high-port count optical switches.

Field Trial of 64OGbit/s-Throughput, Granularity-Flexible, 3-node Optical Network using Packet-Selective ROADM Prototypes

We develop 640 Gbit/s-throughput, packet-selective ROADM prototype and demonstrate a field trial of granularity-flexible 3-node optical network at 40-Gbit/s over 173-km. Error-free packet ADM for all 16-wavelength channels are obtained.