Related Experiment Video
Updated: Jul 4, 2025
09:23
Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
Published on: May 30, 2014
14.5K
Phase noise-induced interference for coherently detected OTDR systems.
Optics Letters
|February 1, 2024
Summary
Phase noise-induced interference (PNII) in coherent OTDR systems is analyzed. A new formula links laser linewidth to signal-to-noise ratio, revealing amplitude noise comprises one-third of PNII.
Area of Science:
- Optical Engineering
- Signal Processing
- Telecommunications
Background:
- Coherently detected Optical Time Domain Reflectometry (OTDR) systems are crucial for fiber optic network characterization.
- Phase noise-induced interference (PNII) is a significant limiting factor in the performance of these systems.
- Understanding the composition and impact of PNII is essential for system optimization.
Purpose of the Study:
- To investigate phase noise-induced interference (PNII) in coherently detected OTDR systems.
- To derive a novel, close-form relationship between signal-to-noise ratio (SNR) and laser linewidth.
- To analyze the noise composition of PNII, specifically the contribution of amplitude noise.
Main Methods:
- Theoretical derivation of a closed-form expression for PNII.
- Numerical simulations to validate the derived theoretical relationship.
- Analysis of the spectral characteristics of PNII to determine noise proportions.
Main Results:
- A novel, close-form relationship between SNR and laser linewidth for PNII is established.
- Numerical simulations confirm the accuracy of the theoretical findings.
- Amplitude noise is quantified to constitute one-third of the total PNII.
Conclusions:
- The derived analytical form of PNII enhances the understanding of coherent OTDR systems.
- This research provides critical guidelines for designing high-performance, cost-effective coherent OTDR systems.
- The findings are applicable to various OTDR applications requiring precise fiber characterization.
Related Concept Videos
01:10Interference: Path Lengths
1.3K
Consider two sources of sound, that may or may not be in phase, emitting waves at a single frequency, and consider the frequencies to be the same.
Two special sources may be considered when they are in phase. This can be easily achieved by feeding the two sources from the same source. An example would be synchronizing the two speakers by feeding them with the same source, such as the sound waves produced by a tuning fork. This setup ensures that the two sources have the same frequency and are...
Two special sources may be considered when they are in phase. This can be easily achieved by feeding the two sources from the same source. An example would be synchronizing the two speakers by feeding them with the same source, such as the sound waves produced by a tuning fork. This setup ensures that the two sources have the same frequency and are...
1.3K
00:53Sound Waves: Interference
3.8K
Sound waves can be modeled either as longitudinal waves, wherein the molecules of the medium oscillate around an equilibrium position, or as pressure waves. When two identical waves from the same source superimpose on each other, the combination of two crests or two troughs results in amplitude reinforcement known as constructive interference. If two identical waves, that are initially in phase, become out of phase because of different path lengths, the combination of crests with troughs...
3.8K
01:07Interference and Superposition of Waves
5.2K
When two waves of the same nature occur in the same region simultaneously, they result in interference. Interference of waves implies that the net effect of the waves is the sum of the individual waves' effects. However, it does not imply that the individual waves affect the propagation of other waves.
Interference occurs in mechanical waves, such as sound waves, waves on a string, and surface water waves. Mechanical waves correspond to the physical displacement of particles. Hence,...
Interference occurs in mechanical waves, such as sound waves, waves on a string, and surface water waves. Mechanical waves correspond to the physical displacement of particles. Hence,...
5.2K
01:02¹H NMR: Interpreting Distorted and Overlapping Signals
1.0K
Spin systems where the difference in chemical shifts of the coupled nuclei is greater than ten times J are called first-order spin systems. These nuclei are weakly coupled, and their chemical shifts and coupling constant can generally be estimated from the well-separated signals in the spectrum.
As Δν decreases and the signals move closer, the doublets appear increasingly distorted. The intensities of the inner lines increase at the cost of those of the outer lines as the signals are...
As Δν decreases and the signals move closer, the doublets appear increasingly distorted. The intensities of the inner lines increase at the cost of those of the outer lines as the signals are...
1.0K
01:20Inductively Coupled Plasma-Mass Spectrometry (ICP-MS): Interferences
474
Inductively coupled plasma–mass spectrometry (ICP–MS) is a highly selective and sensitive technique for accurate elemental analysis. Though the analysis of ICP–MS mass spectra is comparatively straightforward, it is affected by spectroscopic and non-spectroscopic interferences. Spectroscopic interferences arise when the plasma contains ionic species with an m/z value the same as the analyte ion. Spectroscopic interference can be categorized as isobaric, polyatomic ions, and...
474
01:12Double Resonance Techniques: Overview
210
Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
Spin decoupling is usually achieved by...
Spin decoupling is usually achieved by...
210