Related Experiment Video
Updated: May 10, 2026
09:43
Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping
Published on: March 20, 2017
Terabit-scale orbital angular momentum mode division multiplexing in fibers
Nenad Bozinovic1, Yang Yue, Yongxiong Ren
1Department of Electrical and Computer Engineering and Photonics Center, Boston University, Boston, MA 02215, USA.
Science (New York, N.Y.)
|July 2, 2013
Summary
Researchers are using the orbital angular momentum (OAM) of light to boost internet data capacity. This method multiplexes data streams in a single fiber, achieving terabits per second transmission rates.
Area of Science:
- Optics
- Telecommunications
- Data Transmission
Background:
- Internet data traffic is approaching the limits of current optical fiber technology.
- Existing methods for multiplexing data streams are nearly exhausted.
- Spatial modes in optical fibers are being investigated to increase data capacity.
Purpose of the Study:
- To demonstrate the viability of using orbital angular momentum (OAM) for data multiplexing.
- To explore OAM as a new degree of freedom for enhancing fiber optic data capacity.
Main Methods:
- Utilizing the orbital angular momentum (OAM) of light to create distinct data streams.
- Multiplexing these OAM modes within a single optical fiber.
- Employing a specially designed optical fiber to minimize mode coupling over 1.1 km.
Main Results:
- Achieved 400 gigabits per second (Gbps) data transmission using four OAM modes at a single wavelength.
- Transmitted 1.6 terabits per second (Tbps) using two OAM modes across 10 wavelengths.
- Demonstrated successful multiplexing of data streams via OAM in a single fiber.
Conclusions:
- Orbital angular momentum (OAM) is a viable method for increasing data capacity in optical fibers.
- OAM offers a new spatial dimension for multiplexing data, overcoming current limitations.
- This technology holds promise for future high-capacity fiber optic networks.
Related Concept Videos
01:31Energy Stored In A Coaxial Cable
A coaxial cable consists of a central copper conductor used for transmitting signals, followed by an insulator shield, a metallic braided mesh that prevents signal interference, and a plastic layer that encases the entire assembly.
In the simplest form, a coaxial cable can be represented by two long hollow concentric cylinders in which the current flows in opposite directions. The magnetic field inside and outside the coaxial cable is determined by using Ampère's law. The magnetic field inside...
In the simplest form, a coaxial cable can be represented by two long hollow concentric cylinders in which the current flows in opposite directions. The magnetic field inside and outside the coaxial cable is determined by using Ampère's law. The magnetic field inside...
01:08IR Spectrum Peak Splitting: Symmetric vs Asymmetric Vibrations
Identical bonds within a polyatomic group can stretch symmetrically (in-phase) or asymmetrically (out-of-phase). Similar to hydrogen bonding, these vibrations also influence the shape of the IR peak. Generally, asymmetric stretching frequencies are higher than symmetric stretching frequencies. For example, primary amines exhibit two distinct IR peaks between 3300–3500 cm−1 corresponding to the symmetric and asymmetric N-H stretching, while secondary amines exhibit a single stretching vibration...
01:13¹H NMR Signal Multiplicity: Splitting Patterns
When protons A and X are coupled, their nuclear spin energy levels are slightly modified. This is because the energy required to excite proton A to a spin state parallel to proton X is slightly different from the energy required for it to become anti-parallel to spin X. Consequently, there are two possible excitation frequencies for A (A1 and A2), depending on the spin state of X, and vice versa. The mutual nature of coupling implies that the difference between frequencies A1 and A2, indicated...
01:24Cable Subjected to a Distributed Load
The analysis of suspension bridges is a complex and critical process that involves multiple factors, including the shape and tension of the main cables. The main cables of suspension bridges are subjected to distributed loads, which result in changes in tensile forces and deformation of the cable. These loads must be carefully considered to ensure that the bridge is safe and capable of supporting the weight of different loads.