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The wavelength tunable filter will play a key role in realizing C/D/C add/drop functions in ROADMs. We fabricate a novel tunable filter for 192 optical channels on a PLC chip. Transmission experiments verify its optical characteristics.
We demonstrate efficient Colorless/Directionless/Contentionless add/drop configuration utilizing newly proposed tunable filters to develop flexible OXCs/ROADMs. The filter is compactly fabricated on a 15×70 mm2 PLC chip and the performance was verified.
We describe a compact transponder aggregator comprising a splitter-switch and a tunable filter array based on PLC technology. We realize a colorless, directionless and contentionless multi-degree ROADM node cost-effectively with a small footprint.
We demonstrate a colourless, directionless, contentionless ROADM consisting of 1×43 WSSs and PLC-based transponder aggregators. The experimental results show that the introduction of a C/D/C-less function causes no significant penalty for 127-Gbit/s DP-QPSK signal transmission.
An eight-channel thermo-optic switch with a low power consumption of 0.7 mW/channel, based on a silicon silica hybrid structure, is described. The extinction ratio is improved from 3 dB to more than 15 dB by using birefringence control with an Ar ion laser trimming technique.
We describe an 8-channel switch with a low power of 0.7 mW/channel based on a silicon-silica hybrid structure. We improve the extinction ratio from 3 dB to > 15 dB by using a laser trimming.
A low-loss silicon photonic wire waveguide with low-impedance p-i-n carrier injection structures was developed. The propagation loss of the waveguide was less than 2 dB/cm and the input-impedance was adjustable around a few ten ohms. In a compact variable optical attenuator using this waveguide, the power consumption giving 30-dB attenuation was about 55 mW, and the response time was about 2 ns. A...
We have developed the first silica-based PLC type 32 x 32 optical matrix switch. The switch is the largest scale waveguide type switch yet reported, which has excellent optical characteristics with an average insertion loss of 6.6 dB.
We report our recent progress on Si-wire-based optical devices. We made some functional devices that integrate several fundamental components and confirmed that they exhibited excellent characteristics due to the accuracy of Si microfabrication.
We constructed a prototype scalable 128×128 optical switch system using silica-based 1×128 thermo-optic switches. The system provides high levels of performance namely a low insertion loss (<6.5dB) and a high extinction ratio (>90dB).
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