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Related Concept Videos

Metal-Semiconductor Junctions01:24

Metal-Semiconductor Junctions

352
The contact of metal and semiconductor can lead to the formation of a junction with either Schottky or Ohmic behavior.
Schottky Barriers
Schottky barriers arise when a metal with a work function (Φm) contacts a semiconductor with a different work function (Φs). Initially, electrons transfer until the Fermi levels of the metal and semiconductor align at equilibrium. For instance, if Φm > Φs, the semiconductor Fermi level is higher than the metal's before contact. The...
352
Biasing of Metal-Semiconductor Junctions01:27

Biasing of Metal-Semiconductor Junctions

259
Biasing metal-semiconductor junctions involves applying a voltage across the junction. Specifically, the metal is connected to a voltage source, while the semiconductor is grounded. This technique is essential for controlling the direction and magnitude of current flow in electronic devices, including diodes, transistors, and photovoltaic cells.
In Schottky junctions, where the semiconductor is n-type, applying a positive voltage to the metal relative to the semiconductor reduces its Fermi...
259
MOSFET: Enhancement Mode01:22

MOSFET: Enhancement Mode

336
Enhancement-mode MOSFETs are pivotal components in electronics, distinguished by their capacity to act as highly efficient switches. They are part of the larger family of metal-oxide Semiconductor Field-Effect Transistors (MOSFETs). They are available in two types: p-channel and n-channel, each tailored to specific polarity operations.
In their basic form, enhancement-mode MOSFETs are typically non-conductive when the gate-source voltage (Vgs) is zero. This default 'off' state means no...
336
Design Example: Capacitance Multiplier Circuit01:20

Design Example: Capacitance Multiplier Circuit

776
In integrated circuit technology, a capacitance multiplier is often utilized to produce a larger capacitance value when a small physical capacitance falls short. This is achieved by a circuit that multiplies capacitance values by a factor of up to 1000, such that a 10-pF capacitor can replicate the performance of a 100-nF capacitor.
The circuit illustrated in Figure 1 below incorporates two op-amps, with the first operating as a voltage follower and the second acting as an inverting amplifier.
776
Semiconductors01:22

Semiconductors

703
There is variation in the electrical conductivity of materials - metals, semiconductors, and insulators that are showcased with the help of the energy band diagrams.
Metals such as copper (Cu), zinc (Zn), or lead (Pb) have low resistivity and feature conduction bands that are either not fully occupied or overlap with the valence band, making a bandgap non-existent. This allows electrons in the highest energy levels of the valence band to easily transition to the conduction band upon gaining...
703
MOSFET Amplifiers01:17

MOSFET Amplifiers

159
The MOSFET, when operating in its active region, functions as a voltage-controlled current source. In this region, the gate-to-source voltage controls the drain current. This principle underlies the operation of the transconductance MOSFET amplifier. The output current is directed through a load resistor to convert this amplifier into a voltage amplifier. The output voltage is then obtained by subtracting the voltage drop across the load resistance from the supply voltage. This process results...
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Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source
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A 5 × 200 Gbps microring modulator silicon chip empowered by two-segment Z-shape junctions.

Yuan Yuan1, Yiwei Peng2, Wayne V Sorin2

  • 1Hewlett Packard Labs, Hewlett Packard Enterprise, Milpitas, CA, 95035, USA. yuan.yuan@hpe.com.

Nature Communications
|January 31, 2024
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Silicon microring resonator modulators achieve 1 Tb/s data rates by mitigating the bandwidth-efficiency trade-off. This breakthrough enables high-speed optical interconnects for artificial intelligence applications.

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Area of Science:

  • Photonics and Optical Engineering
  • Materials Science
  • Electrical Engineering

Background:

  • Optical interconnects are crucial for accelerating data transmission in the artificial intelligence era.
  • Silicon microring resonator modulators offer cost-effectiveness, compact size, and wavelength multiplexing for optical modulation.
  • A key challenge is the trade-off between bandwidth and modulation efficiency in existing devices.

Purpose of the Study:

  • To demonstrate a high-performance silicon microring modulator array for dense wavelength division multiplexing.
  • To overcome the bandwidth-efficiency trade-off in silicon depletion-mode modulators.
  • To achieve a total data rate of 1 Tb/s with low energy consumption.

Main Methods:

  • Development of a dense wavelength division multiplexing microring modulator array on a silicon chip.
  • Utilizing two individual p-n junctions with an optimized Z-shape doping profile.
  • Characterization of device performance, including data rate and energy consumption.

Main Results:

  • Demonstration of a silicon microring modulator array achieving a full data rate of 1 Tb/s.
  • Mitigation of the bandwidth-efficiency trade-off through optimized Z-shape doping.
  • Achieved energy consumption of sub-ten fJ/bit for high-speed modulation.

Conclusions:

  • All-silicon microring modulators can practically enable future 200 Gb/s/lane optical interconnects.
  • The optimized Z-shape doping strategy effectively addresses performance limitations.
  • This technology paves the way for scalable and efficient optical communication systems.