We employ spectrally filtered amplified spontaneous emission as the signal carrier and matched local oscillator to mitigate optical crosstalk. We demonstrate polarization crosstalk reduction in single-mode fiber transmission and modal crosstalk reduction over multimode fiber.
We present pilot-assisted burst mode DSP design for high-order QAM signals. Short preambles are used for frame, frequency synchronization and channel estimation. The proposed scheme is experimentally demonstrated to detect 16G-baud PDM 128/256/512-QAM bursts.
We experimentally demonstrate that a transmitter-side Volterra-based pre-distortion for 56 GBaud, PAM4 signal with receiver FFE outperforms receiver-side Volterra filtering and allows for 70% higher tolerance to chromatic-dispersion. Transmitter coefficients are computed without receiver feedback.
We transmit 381Ã24.5 Gbaud PDM-64-QAM modulated channels per mode of a 30 km graded-index three-mode fiber, resulting in a record per-mode data-rate of 93.34 TBit/s and an aggregated net-data-rate of 280 Tbit/s.
10Gb/s Low-Cost Directly Modulated Multi-Electrode Laser with Suppressed Thermal Wavelength Drift for Burst-Mode Upstream Transmission in TWDM-PONs
We report on a novel 10Gb/s low-cost multi-electrode DML employed as a very wavelength stable burst-mode source for upstream TWDM-PONs. 10X wavelength drift reduction is achieved compared to conventional DMLs enabling transmission on 100GHz grid.
We demonstrate record single-carrier 560-Gb/s over 6,600 km and 430-Gb/s transmission over 13,200 km, as well as dual-carrier 850-Gb/s over 6,600km, and 1-Tb/s over 3,960km, leveraging advanced DACs, wideband receiver, probabilistic shaping and nonlinear mitigation.
We experimentally demonstrate an actively-filtered receiver for TDM-PON. Bias-current tuning of a DFB-based-filter enables tracking the wavelength-drift of DML under burst-mode operation. We measure >70% reach increase, >5dB sensitivity improvement, and 4.8dB higher extinction ratio.
Frequency-Resolved Measurements of Signal, Noise, and Signal-Signal Beat Interference in Self-Coherent Direct-Detection Receivers
We demonstrate a novel measurement technique that uniquely identifies the power spectral densities of signal, signal-signal-beat interference, and noise in direct-detection receivers.
We have designed a novel convolutional neural network based nonlinear classifier that outperforms traditional Volterra nonlinear equalizers. A BER of 3.50 Ã 10-6 is obtained for a 112-Gbps PAM4 EML-based optical link over 40-km SMF transmission.
Commercial PONs have traditionally leveraged mature components from transport systems. Starting with 25G PON, the data center ecosystem will be leveraged. A strategy to accommodate higher loss budgets at lower cost is presented.
Software-defined network management systems presently lack joint link-status awareness on both packet and optical layers. Using a NOS with cross-layer link awareness, we demonstrate faster service restoration of packet links over failed optical links.
We demonstrate PDM-QPSK transmission over 4480 km at a record all-electronically multiplexed symbol rate of 180 GBaud, providing a line rate of 720 Gb/s on a single optical carrier enabled by high-speed InP-DHBT selectors.
We report a 6-core coupled-core fiber amplifier compatible with 6-mode FMF. The coupled-core amplifier not only reduces mode dependent gain but also introduces strong random mode mixing, thus easing mode dependent impairments in FMF transmission systems.
Pump Mode Characterization of Annular Cladding Erbium-Doped Fibers Using Low-Coherence Interferometry
We characterize core and cladding pump modes of annular cladding 6-core 3-mode erbium-doped fibers using low-coherence interferometry (LCI). Efficient mode conversion at pump wavelength for modal gain equalization is also demonstrated and characterized by LCI.
We demonstrate an on-off keyed transmitter with direct detection, at record symbol rates of 204Gbaud and 140Gbaud, over 10km and 80km, respectively, powered by a high-speed InP-based 2:1 selector and travelling-wave electro-absorption laser-modulator.
We designed an ultra-fast real-time bandwidth-variable transmitter achieving zeropacket loss with â¼10Î¼s switching time, â¼40Ã faster than previous record. We use a new coding scheme to generate baud rates and measure reconfiguration through SDN control.
Experimental Demonstration of Fully Disaggregated White Box Including Different Types of Transponders and Monitors, Controlled by NETCONF and YANG
We experimentally demonstrated a fully disaggregated white box composed of two different types of transponders, monitors (including filtering effect parameters), add-drop multiplexers, and switches. NETCONF and YANG control the hardware.
1. Network traffic growth remains strong Sold WDM transponder capacity scales at â¼45% Scaling is widely supported by compute, storage, access scaling Optical transport is significantly falling behind â Worrisome scaling disparities (âCapacity Crunchâ) 2. Parallelism is mandatory log(SNR) scaling vs. linear (pre-log) multiplexing gains 3. By 2025 we will ...
- Bertrand M.
- Chen X.
- Marko Lon?Ar
- Sethumadhavan C.
- Shams-Ansari A.
- Wang C.
- Winzer P.
- Zhang M.
We demonstrate integrated lithium niobate electro-optic modulators with up to 100-GHz electro-optic bandwidth and V<sub>π</sub> as low as 1.4 V. We show 70 GBaud and 100 GBaud m-ASK modulation with the fabricated modulator.
We discuss the impact of probabilistic amplitude shaping on the forward error correction stage in future optical transceivers and highlight some potential pitfills, as well as challenges and opportunities for future research that may arise.