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光电信息大讲堂第213期：低功耗高速通信电路与系统Low-Power and High-Speed Communications Circuits and Systems
物联网 无线电收发器 通信电路
2023/4/17
物联网的普遍应用依赖于以不断增长的速度高效地收集、交换和处理信息的能力。这对通信电路和系统的设计提出了巨大的挑战：在设备节点中，无线电通信需要同时实现低功耗、高性能和低成本；在核心数据网络（云）中，海量数据必须以超高吞吐量移动，要求信号链和时钟的高精度和保真度。为了应对这些挑战，本次报告讨论了用于物联网、医疗保健和生物医学应用的超低功率无线电收发器的几种创新架构和电路实现，以及高性能频率产生技术。...
Tiny Black Holes Enable a New Type of Photodetector for High-Speed Data
Tiny Black Holes Enable New Type Photodetector High-Speed Data
2017/4/27
Tiny “black holes” on a silicon wafer make for a new type of photodetector that could move more data at lower cost around the world or across a data center. The technology, developed by electrical eng...
High-speed Fading-free Direct Detection for DoubleSideband OFDM Signal via Block-wise Phase Switching
High-speed Fading-free Direct Detection Double Sideband OFDM Signal Block-wise Phase Switching
2014/11/6
We employ phase switching of either main-carrier or subcarriers of two consecutive signal blocks for double-sideband fading-free direct-detection (DD). In so doing, 40-Gb/s DDOOFDM is successfully rec...
High-speed and broadband electro-optic silicon switch with submilliwatt switching power
High-speed broadband electro-optic silicon switch submilliwatt switching power
2015/5/26
We present a 2x2 silicon electro-optic switch with a submilliwatt switching power (0.6 mW), a broad bandwidth (60 nm), and ultrafast speed (6 ns). Free-carrier injection Mach-Zehnder interferometers a...
New Ground-to-Train High-Speed Free-Space Optical Communication System with Fast Handover Mechanism
Free-space optical communication Scanners
2015/5/26
We developed a new ground-to-train free-space optical communication system that performs stable high-speed communication even when a train is running at high speed and does fast handover between laser...
Using simple intensity-modulation direct-detection systems, low-cost transceivers and easy-to-install 1-mm core diameter plastic fibers, recent activities on multigigabit baseband and ultra-wideband r...
25GHz Hybrid Silicon Mach-Zehnder Modulator using High-Speed Push-Pull Slotline Design
General Modulators
2015/5/26
We demonstrate a hybrid silicon Mach-Zehnder modulator having a voltage-length product of 2.4 V-mm and chirp parameter of -0.75. This modulator also has a modulation bandwidth of 25 GHz.
High Speed Energy-Efficient Germanium Electro- absorption Modulator Featuring Monolithic Integration with Germanium p-i-n Photodetector
Optical devices Modulators
2015/5/26
We report a novel evanescent-coupled germanium electro-absorption modulator with a small active area of 16 μm 2 OCIS codes: (230.0230) Optical devices; (230.4110) Modulators giving an extinction ratio...
Three-Dimensional Subcarrier-Multiplexed Nonbinary- LDPC-Coded Modulation Schemes Enabling Ultra High Speed Optical Communications
Fiber optics communications Modulation Low-density parity-check codes
2015/5/25
We propose nonbinary-LDPC-coded modulation schemes employing subcarrier-multiplexing and three-dimensional constellations. We improve coding gains of conventional PDM-M-QAM by 2.17dB and 2.92dB, for M...
First Experimental Demonstration of Nonbinary LDPC- Coded Modulation Suitable for High-Speed Optical Communications
Fiber optics and optical communications Modulation Low-density parity- check (LDPC) codes
2015/5/25
The first experimental demonstration of nonbinary-LDPC-coded optical transmission is presented. Using DQPSK, we can achieve >8dB and ~10dB net coding gains at the BER of 10 -6 in the absence and prese...
On the Reverse Concatenated Coded-Modulation for Ultra- High-Speed Optical Transport
Fiber optics optical communications Reverse concatenated FEC
2015/5/25
We propose reverse concatenated code with inner BCH code and outer LDPC code.BCH decoder is based on MAP-decoding that provides high-accuracy-reliabilities for suboptimum-LDPC-decoder, leading to perf...
Layered Decoding of Nonbinary LDPC Codes Suitable for High-Speed Optical Communications
Optical communications Forward error correction Low-density parity- check codes
2015/5/25
We propose using layered update rule in decoding nonbinary LDPC codes. Only 10-15 iterations suffice for good performance. Also, for the same BER performance, it increases throughput by twofold compar...
High-Speed Potential of Field-Induced Charge-Separation Lasers for Short-link Applications
Vertical cavity surface emitting lasers Laser theory Modulation
2015/5/25
Novel three-terminal FICSLs in VCSEL form were designed and fabricated for direct gain modulation, which by analysis introduces an additional zero to the modulation transfer function and promises modu...
We describe the performance of 1.3-μm InGaAlAs RWG-MQW-DFB lasers and EA-DFB lasers applicable to 40G/100G Ethernet. We obtained a 3-dB-down bandwidth frequency of over 30 GHz and clear eye opening at...
High Speed High Temperature Stable 980 nm VCSELs Operating Error-Free at 25 Gbit/s up to 85 °C for Short Reach Optical Interconnects
Vertical cavity surface emitting lasers Optical communications
2015/5/25
We present high speed highly temperature stable 980 nm VCSELs for short reach optical interconnects operating error-free at 25 Gbit/s from room temperature up to 85 °C without adjustment of the drivin...