Related Experiment Video
Updated: Jan 22, 2026
08:39
Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator
Published on: January 28, 2019
10.3K
Low phase noise optoelectronic oscillator based on an electroabsorption modulated laser
Applied Optics
|June 29, 2019
Summary
This study demonstrates an optoelectronic oscillator (OEO) using an electroabsorption modulated laser (EML) to generate a 20-GHz microwave signal. The experimental results validate a detailed phase noise model for this EML-based OEO system.
Area of Science:
- Photonics
- Microwave Engineering
- Optoelectronics
Background:
- Optoelectronic oscillators (OEOs) are crucial for generating high-frequency signals.
- Electroabsorption modulated lasers (EMLs) offer a compact solution for OEOs.
- Accurate phase noise modeling is essential for OEO performance evaluation.
Purpose of the Study:
- To propose and experimentally demonstrate a novel OEO scheme utilizing an EML.
- To develop a comprehensive phase noise model for the EML-based OEO.
- To evaluate the performance of the generated microwave signal, focusing on phase noise.
Main Methods:
- Proposed an optoelectronic oscillator (OEO) scheme incorporating an electroabsorption modulated laser (EML).
- Developed a detailed theoretical model for oscillation conditions and phase noise analysis.
- Experimentally generated and measured a 20-GHz microwave signal, evaluating its side-mode suppression ratio and single sideband phase noise.
Main Results:
- Successfully generated a 20-GHz microwave signal with a side-mode suppression ratio of 42 dB.
- Measured single sideband phase noise of -110.2 dBc/Hz at 10 kHz offset with a 1-km fiber loop.
- Measured single sideband phase noise of -114.8 dBc/Hz at 10 kHz offset with a 4-km fiber loop.
- Experimental phase noise results showed excellent agreement with theoretical predictions across a wide offset frequency range (100 Hz to 10 MHz).
Conclusions:
- The EML-based OEO scheme is a viable approach for generating high-quality microwave signals.
- The developed phase noise model accurately predicts the oscillator's performance.
- This work contributes to advancements in high-frequency signal generation for various applications.
Related Concept Videos
01:30Oscillations In An LC Circuit
3.0K
An idealized LC circuit of zero resistance can oscillate without any source of emf by shifting the energy stored in the circuit between the electric and magnetic fields. In such an LC circuit, if the capacitor contains a charge q before the switch is closed, then all the energy of the circuit is initially stored in the electric field of the capacitor. This energy is given by
3.0K
01:06Forced Oscillations
7.7K
When an oscillator is forced with a periodic driving force, the motion may seem chaotic. The motions of such oscillators are known as transients. After the transients die out, the oscillator reaches a steady state, where the motion is periodic, and the displacement is determined.
7.7K
01:07Damped Oscillations
6.8K
In the real world, oscillations seldom follow true simple harmonic motion. A system that continues its motion indefinitely without losing its amplitude is termed undamped. However, friction of some sort usually dampens the motion, so it fades away or needs more force to continue. For example, a guitar string stops oscillating a few seconds after being plucked. Similarly, one must continually push a swing to keep a child swinging on a playground.
Although friction and other non-conservative...
Although friction and other non-conservative...
6.8K
01:04Oscillations about an Equilibrium Position
6.8K
Stability is an important concept in oscillation. If an equilibrium point is stable, a slight disturbance of an object that is initially at the stable equilibrium point will cause the object to oscillate around that point. For an unstable equilibrium point, if the object is disturbed slightly, it will not return to the equilibrium point. There are three conditions for equilibrium points—stable, unstable, and half-stable. A half-stable equilibrium point is also unstable, but is named so...
6.8K
02:39Phase Diagrams
49.2K
A phase diagram combines plots of pressure versus temperature for the liquid-gas, solid-liquid, and solid-gas phase-transition equilibria of a substance. These diagrams indicate the physical states that exist under specific conditions of pressure and temperature and also provide the pressure dependence of the phase-transition temperatures (melting points, sublimation points, boiling points). Regions or areas labeled solid, liquid, and gas represent single phases, while lines or curves represent...
49.2K
02:31Phase Transitions
22.8K
Whether solid, liquid, or gas, a substance's state depends on the order and arrangement of its particles (atoms, molecules, or ions). Particles in the solid pack closely together, generally in a pattern. The particles vibrate about their fixed positions but do not move or squeeze past their neighbors. In liquids, although the particles are closely spaced, they are randomly arranged. The position of the particles are not fixed—that is, they are free to move past their neighbors to...
22.8K