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We demonstrate noise suppression for 40 frequency comb-lines of narrow 10 GHz pitch using narrowband Brillouin amplification pumped by dispersion-managed spectral-lines seeded from the comb itself. Improved carrier performance for 96Gb/s-DP-64QAM signals is shown.
We exploit a SiN/Si double-layer platform for an ultra-low crosstalk multi-port optical switch that exhibits −50 dB crosstalk in a bandwidth wider than the C-band. The platform possesses full compatibility with a silicon photonics platform.
We present a wavelength-tunable band-pass filter composed of multi-stage cascaded asymmetric Mach-Zehnder interferometers. The fabricated seven and eight-stage filters exhibit full tunability in the C-band, and 3 dB on-chip loss, and 0.27 nm (33 GHz), 0.14 nm (18 GHz) bandwidth respectively.
We demonstrate a novel method for monitoring internal paths of an optical switch exploiting light labeling technique. Using this method, the optical paths of a 4×4 optical fiber matrix switch could be monitored in 5ms without affecting the transmission performance.
An ultra-compact Si-wire reconfigurable finite impulse response (FIR) filter with 16 taps is reported. Targeting Nyquist spectrum, we successfully demonstrate bandwidth-tunable optical filtering for pass bandwidth of 30, 40, and 50 GHz.
This paper proposes an efficient node architecture for installing all-optical wavelength converters (AO-WCs). Introducing wavelength conversion to optically-switched networks is effective to resolve wavelength contention and achieve high network resource utilization. All-optical wavelength conversion is attractive because it offers multi-channel conversion capability. To take the full advantage of...
We demonstrate a novel method for monitoring internal paths of optical nodes exploiting light labeling technique. The optical paths of a 2×2 wavelength cross connect could be monitored in 2ms without affecting transmission performance.
A performance-assured Network Function Virtualization (NFV) method for software-based packet processing on an open and disaggregated optical transport systems will be demonstrated. Our technique improves NFV operations by leveraging cache memory allocation and monitoring.
We demonstrate noise suppression for parametrically generated optical frequency comb-lines with low 10GHz-pitch by narrowband Brillouin amplification pumped self-seeded via single-sideband modulation (SSB). Comb-line carrier performance close to a reference laser is achieved for 96Gb/s-DP-64QAM.
We demonstrate the effectiveness of multi-channel, format-agnostic, all-optical wavelength converters (AO-WCs) in improving network utilization. Simulations show doubled network utilization with significantly fewer AO-WCs and experiments confirm successful multichannel conversions over full operating wavelength range.
We present a 1-RU silicon photonics 8×8 switch with a low PDL (<0.5 dB) and a broad operating bandwidth (35 nm at −20 dB crosstalk). 32-Gbaud DP-QPSK WDM transmission was demonstrated with no OSNR penalty.
We demonstrate a polarization-diversity 8×8 thermo-optic Si-wire switch that uses only a single PILOSS switch matrix integrated with polarization splitter-rotators. A PDL of 2 dB and DGD of 1.5 ps are achieved in C-band.
A node controller is addressed to ease operations such as alarm monitoring and path provisioning for the centralized controller. It is actually implemented on off-the-shelf servers to successfully perform fast protections in disaggregated optical nodes.
We implemented a novel heater control scheme with high-energy header pulses applied to silicon Mach-Zehnder switches. Four to five times faster switching time (5.8 μs and 4.4 μs) was achieved for heating-up and cooling-down operations.
The dissemination of the digital coherent technology has enabled the recent growth of information networks, which has obviated signal processing in the optical domain such as optical dispersion compensation. However, the further scaling of the digital coherent technology will eventually suffer from the slowdown of the Moore's law and/or the energy crunch as a result of the longstanding relentless...
A low noise, 40 GHz optical frequency comb is demonstrated using an actively mode-locked fiber laser with phase stabilization by cross-phase modulation in nonlinear fiber. Extracted comb-lines modulated with 96 Gb/s DP-64QAM signals achieve bit-error rates <4.5×10−3.
We demonstrate all 1024 path connections of a compact 32×32 strictly-non-blocking thermooptic Si-wire switch. Advanced 300-mm wafer fabrication, dense electronic flip-chip packaging, and pulse-width-modulation heater control are successfully integrated.
We propose a fast and large-scale optical circuit-switch architecture for intra-datacenter applications. A 1,440×1,440 optical switch is designed and tested with 180-wavelength signals in the full C band; the worst switching time is 498 microseconds.
A 5×5 Wavelength Selective Switch (WSS) is proposed and demonstrated. The cross-connect optics has the orthogonal imaging systems operating in the switching plane and the dispersion one differently. The switching plane has the 2f-Fourier optics with Rayleigh length. On the other hand, the dispersion plane has the 4f- imaging optics. Two types of switching engine, as MEMS Mirrors and Liquid Crystal...
Dispersion effect in the dual-pump degenerated phase sensitive amplifiers has been investigated. More than 30-dB gain extinction ratio has been achieved at a nonlinear phase shift of only 0.73 rad by adjusting the fiber dispersion.
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