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We have experimentally evaluated a bit rate dependence of superimposed AMCC signal on 64B/66B line coded CPRI option 8 signal. We have clarified the trade-off relationship between bit rate of AMCC and degradation of main signal.
We have proposed optical superimposition scheme employing a magneto-optic VOA as a simple and low cost implementation of AMCC system and experimentally confirmed lower power penalty in AMCC superimposition.
We proposed DWDM-PON architecture, which utilize wavelength selective switch with tunable OLT for dynamic reconfiguration of coordinated multi-point transmission in high density small cell network. We successfully demonstrated the dynamic routing and monitoring behavior employing pilot tone scheme.
Highly accurate optical pass-band shape monitor was proposed by employing FM-CW probe light immune to accumulated ASE noise. We experimentally show that this method can achieve high accuracy until 5dB optical probe to noise ratio.
We developed real-time FSK light labeling system using DAC-based label superimposition. We successfully demonstrated the monitor performance of light label scheme in CDCG ROADM network with 17-cascaded-WSS for four-sub-carrier 32GBaud DP-QPSK superchannel.
The crosstalk of FSK supervisory signal encoded on 80×128Gbit/s DP-QPSK WDM channels in CNCG-ROADM networks was experimentally and theoretically estimated. The simulation results confirm that 30-cascaded ROADM could be supported with proper FSK signal decoder parameters.
We present theoretical and experimental results on PolSK lightpath labels for 100 Gb/s DP-QPSK signals. A 100 Mb/s label data rate is confirmed, with several coding overhead ratios and PDL tolerance of up to 2dB.
We developed an integrated optical path monitoring sub-system prototype that fully integrates three functions; FSK light label monitor, in-band OSNR monitor, as well as conventional optical channel monitor, and successfully demonstrated the monitor operations for 112 Gbps DP-QPSK signals.
We investigated crosstalk of FSK supervisory channel superimposed on a 112 Gbps DP-QPSK caused by pass-band narrowing effect in CNCG ROADM network. We estimated maximum number of ROADM nodes and frequency misalignment tolerance between main signal and center frequency of WSS pass-band that the FSK light label technique could support.
Flexible and dynamic photonic node architecture for next generation software defined photonic network is described. The pooling architecture of universal transceivers provides the better utilization of network element. Also, network monitoring functionalities such as optical path trace and in-band OSNR monitor in future photonic network are shown in this paper.
We developed a frequency shift keying (FSK) light label receiver prototype that enables to detect a Path-ID superimposed on 112 Gbps DP-QPSK signal, and demonstrated the light path tracing capabilities in color-less, non-directional, contention-less and grid-less (CNCG) ROADM network.
We have realized a wavelength-insensitive parallel optical lens coupling scheme and simultaneous driving of all 4 SOAs up to 300 mA in a 4-array integrated SOA module. We drastically improved loss variance over the wide wavelength range and thermal degradation in a module gain.
We have newly developed a high-speed 4×4 SOA switch subsystem using 4-array monolithically-integrated SOA modules and 100/400-GHz interleavers for DWDM systems. We confirmed high-speed switching performance (< 2.5 ns) with almost no crosstalk for 100 GHz-spaced DWDM signals and an equal optical path latency of less than 1.0 ns deviation.
We developed compact dual-channel Fast Automatic Level CONtrolled (FALCON) amplifiers with 172-M cycle/s control using novel folded 1.3-μm and 1.5-μm SOA modules. We achieved the input dynamic range of more than 28 dB with the output deviation of less than 0.2 dB. We demonstrated the feasibility of FALCON operation for optical packets and CW signals.
We developed a compact 4-array integrated SOA module using a novel parallel optical coupling scheme and polarization-insensitive built-in array isolators. We achieved ultra-high On/Off extinction ratio of more than 60 dB and low cross talk of better than −60 dB as well as high-isolation of over 47 dB in wide wavelength range.
A world's first uncooled, polarization-insensitive 1.3-μm SOA module was developed using an AlGaInAs MQW-SOA. A very small gain variance of 3.8 dB including PDG was demonstrated over a wide temperature range from 25 to 75°C at a constant current.
We developed a compact 1.3-μm optical amplifier module using AlGaInAs MQW-SOA operated at 45°C. The module exhibited very low electric power consumption of 0.84W over wide temperature range (0-75°C) and excellent performance as pre-amplifiers in 40 or 100 Gb/s systems.
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...
We propose a 100-Tbps-class throughput WDM optical packet interconnection for peta-flops ultra-high-performance computing systems using multi-gate SOA broadcast- and-elect switch architecture. The fundamental result of 6.4Tbps throughput (100Gbps x 64port) WDM optical packet interconnection is obtained.
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