Related Experiment Video
Updated: Jun 20, 2026
09:43
Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping
Published on: March 20, 2017
Transverse coupling between a single-mode fiber and a thin-film waveguide
Optics Letters
|September 10, 2009
Summary
Researchers developed a novel transverse coupling method for single-mode optical fibers and thin-film waveguides. This technique achieved a low coupling loss of 2 dB at 1.36 micrometers, advancing optical fiber integration.
Area of Science:
- Optoelectronics
- Materials Science
- Photonics
Background:
- Standard single-mode optical fibers are crucial for data transmission.
- Thin-film waveguides are essential components in integrated photonic circuits.
- Efficient coupling between fibers and waveguides is a key challenge in photonics.
Purpose of the Study:
- To introduce a new method for transversely coupling standard single-mode optical fibers to thin-film waveguides.
- To quantify the coupling efficiency and loss of this new method.
Main Methods:
- Development of a novel transverse coupling technique.
- Experimental measurement of coupling loss between fiber and thin-film waveguide.
- Characterization of coupling performance at a specific wavelength.
Main Results:
- A new method for transverse optical fiber to thin-film waveguide coupling was successfully demonstrated.
- A low coupling loss of 2 decibels (dB) was measured.
- The measurements were performed at a wavelength of 1.36 micrometers.
Conclusions:
- The described transverse coupling method offers an efficient way to integrate standard optical fibers with thin-film waveguides.
- The achieved low coupling loss is promising for applications in optical communication and sensing.
- This technique contributes to the advancement of integrated photonic devices.
Related Concept Videos
01:20Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)
Two NMR-active nuclei bonded to a central atom can be involved in geminal or two-bond coupling. Geminal coupling is commonly seen between diastereotopic protons in chiral molecules and unsymmetrical alkenes, among others.
The central atom need not be NMR-active because its electrons are affected by the electron polarization of the spin-active atoms. However, spin information is transmitted less effectively than in one-bond coupling, and 2J values are usually weaker than 1J values. The energy of...
The central atom need not be NMR-active because its electrons are affected by the electron polarization of the spin-active atoms. However, spin information is transmitted less effectively than in one-bond coupling, and 2J values are usually weaker than 1J values. The energy of...
01:22Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)
Vicinal or three-bond coupling is commonly observed between protons attached to adjacent carbons. Here, nuclear spin information is primarily transferred via electron spin interactions between adjacent C‑H bond orbitals. This generally favors the antiparallel arrangement of spins, so 3J values are usually positive.
The extent of coupling depends on the C‑C bond length, the two H‑C‑C angles, any electron-withdrawing substituents, and the dihedral angle between the involved orbitals. The...
The extent of coupling depends on the C‑C bond length, the two H‑C‑C angles, any electron-withdrawing substituents, and the dihedral angle between the involved orbitals. The...
01:23Transmission Line Design Considerations
Aluminum has become the material of choice for overhead transmission lines, surpassing copper due to its abundance and cost-effectiveness. The most prevalent type is the aluminum conductor, steel-reinforced (ACSR), which combines aluminum strands around a steel core. Other variants include all-aluminum conductors (AAC), all-aluminum alloy conductors (AAAC), aluminum conductor alloy-reinforced (ACAR), and aluminum-clad steel conductors. Advanced designs, such as aluminum conductors with steel...
01:28Standing Waves in a Cavity
A household microwave and lasers are examples of standing electromagnetic waves in a cavity. When two conducting metal plates are placed parallel at the nodal planes, it creates a cavity where standing waves are formed. The cavity between the two planes is analogous to a stretched string held at the points x = 0 and x = L. Here, the distance 'L' between the two planes must be an integer multiple of half of the wavelength. The wavelengths that satisfy this condition are given by:
01:07Propagation of Waves
When a wave propagates from one medium to another, part of it may get reflected in the first medium, and part of it may get transmitted to the second medium. In such a case, the interface of the two mediums can be considered as a boundary that is neither fixed nor free.
Consider a scenario where a wave propagates from a string of low linear mass density to a string of high linear mass density. In such a case, the reflected wave is out of phase with respect to the incident wave, however the...
Consider a scenario where a wave propagates from a string of low linear mass density to a string of high linear mass density. In such a case, the reflected wave is out of phase with respect to the incident wave, however the...
01:22Couette Flow
Couette flow represents the flow of fluid between two parallel plates, with one plate fixed and the other moving with a constant velocity. This configuration allows for a simplified analysis using the Navier-Stokes equations, which govern fluid motion under conditions of viscosity and incompressibility. For Couette flow, the assumptions include a steady, laminar, incompressible flow with a zero-pressure gradient in the flow direction. This flow type is beneficial for understanding shear-driven...