Related Experiment Video
Updated: Jun 26, 2026
14:18
Automation of Mode Locking in a Nonlinear Polarization Rotation Fiber Laser through Output Polarization Measurements
Published on: February 28, 2016
Greatly enhanced modulation response of injection-locked multimode VCSELs
Devang Parekh1, Xiaoxue Zhao, Werner Hofmann
1Department of Electrical Engineering and Computer Sciences, University of California, Berkeley, CA 94720, USA. dparekh@eecs.berkeley.edu
Optics Express
|December 24, 2008
Summary
Optical injection locking greatly enhances multimode vertical-cavity surface-emitting lasers (MM-VCSELs) modulation response. This technique achieves a 38 GHz bandwidth and 54 GHz resonance frequency, improving laser performance.
Area of Science:
- Photonics and Optical Engineering
- Semiconductor Device Physics
Background:
- Multimode vertical-cavity surface-emitting lasers (MM-VCSELs) are crucial components in high-speed optical communication systems.
- Enhancing the modulation bandwidth and response of MM-VCSELs is essential for meeting increasing data rate demands.
- Existing methods for improving MM-VCSEL performance have limitations in achieving desired modulation speeds.
Purpose of the Study:
- To investigate the use of optical injection locking to enhance the modulation response of MM-VCSELs.
- To demonstrate transverse mode selection in MM-VCSELs using optical injection locking.
- To achieve significantly higher bandwidth and resonance frequency compared to free-running MM-VCSELs.
Main Methods:
- Employing optical injection locking on a standard MM-VCSEL.
- Utilizing frequency and spatial detuning of the injected light to control laser behavior.
- Characterizing the modulation response, including 3-dB bandwidth and resonance frequency, using high-speed measurements.
Main Results:
- Achieved a 3-dB bandwidth of 38 GHz, a significant enhancement from the MM-VCSEL's free-running bandwidth of 3 GHz.
- Obtained a resonance frequency of 54 GHz, demonstrating a substantial improvement in high-frequency operation.
- Successfully demonstrated transverse mode selection through precise control of optical injection parameters.
Conclusions:
- Optical injection locking is a highly effective method for dramatically enhancing the modulation response of MM-VCSELs.
- This technique enables the achievement of high bandwidth and resonance frequencies, crucial for advanced optical communication.
- Optical injection locking offers a viable pathway for transverse mode control in MM-VCSELs, expanding their application potential.
Related Concept Videos
01:22MOSFET: Enhancement Mode
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 current...
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 current...
01:16Confocal Fluorescence Microscopy
Confocal microscopy is an advanced microscopic technique. The prime advantage of the confocal microscope over other microscopy techniques is its ability to block the out-of-focus light from the illuminated samples using pinholes. It is widely used with fluorescence optics to obtain high-resolution, sharp contrast images. Unlike optical microscopes, confocal microscopes use a focused beam of light laser to scan the entire sample surface at different z-planes. These microscopes are, therefore,...
01:27Biasing of Metal-Semiconductor Junctions
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...
In Schottky junctions, where the semiconductor is n-type, applying a positive voltage to the metal relative to the semiconductor reduces its Fermi...
01:17MOSFET Amplifiers
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...
01:22Biasing of FET
Biasing a Junction Field Effect Transistor (JFET) is crucial for setting operational parameters and ensuring efficient functioning in electronic circuits. JFETs are characterized by using a single carrier type in N-channel or P-channel configurations, where the channel is surrounded by PN junctions. These junctions are central to the device's ability to control current flow.
In an N-channel JFET, the structure consists of N-type material forming the channel on a P-type substrate, with the gate...
In an N-channel JFET, the structure consists of N-type material forming the channel on a P-type substrate, with the gate...