Related Experiment Video
Updated: Jun 29, 2025
09:43
Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping
Published on: March 20, 2017
9.9K
Eigen-function division multiplexed coherent optical transmission in time domain by using higher-order
Optics Express
|April 4, 2024
Summary
We introduce eigen-function division multiplexing (EDM), a novel technique using higher-order Hermite-Gaussian (HG) pulses to boost data transmission capacity. This method enables superimposed HG pulses in the same time slot for enhanced optical communication.
Area of Science:
- Optics and Photonics
- Quantum Mechanics
- Information Theory
Background:
- Conventional optical time domain multiplexing (OTDM) uses interleaving, limiting capacity.
- Higher-order Hermite-Gaussian (HG) pulses offer potential for advanced multiplexing.
Purpose of the Study:
- To introduce and validate a new multiplexing technique called eigen-function division multiplexing (EDM).
- To demonstrate the feasibility of increasing total transmission capacity by superimposing HG pulses.
Main Methods:
- Utilizing higher-order Hermite-Gaussian (HG) pulses, solutions to the Schrödinger equation.
- Employing time-domain orthogonality of HG pulses for demultiplexing.
- Coherent detection via photo-mixing with phase-locked local oscillator HG pulses.
Main Results:
- Numerical and experimental validation of the EDM transmission scheme.
- Successful transmission of four different HG pulses (HG0, HG1, HG2, HG3).
- Achieved 400–480 Gbit/s transmission using 32–64 QAM over 300–450 km.
Conclusions:
- EDM significantly increases transmission capacity by enabling superimposed HG pulses.
- Time-domain orthogonality of HG pulses is key for effective demultiplexing.
- EDM is a promising technique for future high-capacity optical communication systems.
Related Concept Videos
01:30Propagation Speed of Electromagnetic Waves
3.4K
Electromagnetic waves are consistent with Ampere's law. Assuming there is no conduction current Ampere's law is given as:
3.4K
01:26Discrete-time Fourier transform
314
The Discrete-Time Fourier Transform (DTFT) is an essential mathematical tool for analyzing discrete-time signals, converting them from the time domain to the frequency domain. This transformation allows for examining the frequency components of discrete signals, providing insights into their spectral characteristics. In the DTFT, the continuous integral used in the continuous-time Fourier transform is replaced by a summation to accommodate the discrete nature of the signal.
One of the notable...
One of the notable...
314
01:21Time and frequency -Domain Interpretation of Phase-lag Control
90
Phase-lag controllers are widely used in control systems to improve stability and reduce steady-state errors. A dimmer switch controlling the brightness of a light bulb serves as a practical example of phase-lag control, gradually adjusting the bulb's brightness. Mathematically, phase-lag control or low-pass filtering is represented when the factor 'a' is less than 1.
Phase-lag controllers do not place a pole at zero, but instead influence the steady-state error by amplifying any...
Phase-lag controllers do not place a pole at zero, but instead influence the steady-state error by amplifying any...
90
01:24Time and frequency -Domain Interpretation of Phase-lead Control
83
Phase-lead controllers are commonly used in various control systems to enhance response speed and stability. Adjusting the brightness on a television screen offers a practical example of phase-lead control. When contrast is enhanced, a phase-lead controller is employed. Mathematically, phase-lead control is identified when the first parameter is smaller than the second.
The design of phase-lead control involves the strategic placement of poles and zeros to balance steady-state error and system...
The design of phase-lead control involves the strategic placement of poles and zeros to balance steady-state error and system...
83