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Array of grating-fiber couplers.

M Zürn, R Ulrich

|September 22, 2009

Summary

This summary is machine-generated.

Researchers developed a planar optical antenna array using grating-fiber couplers. This array demonstrates frequency-dependent radiation lobe steering for enhanced spectral analysis.

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Area of Science:

Optics and Photonics
Fiber Optic Sensors
Antenna Array Technology

Background:

Grating-fiber couplers are key components in optical systems.
Planar antenna arrays offer directional radiation control.
Frequency-dependent beam steering is crucial for spectral analysis.

Purpose of the Study:

To fabricate and characterize a planar optical antenna array using grating-fiber couplers.
To investigate the frequency-dependent radiation lobe steering capabilities of the array.
To demonstrate the potential of this configuration for spectrometer applications.

Main Methods:

Fabrication of M grating-fiber couplers at equal spacings L(0) along a single-mode fiber.
Coiling the fiber to form a planar optical antenna array.

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Utilizing a spectrometer-type setup with M=3 and L(0)=300 mm for evaluation.

Main Results:

The planar array exhibits frequency-dependent radiation lobe steering.
Radiation lobes sweep slowly along the meridional direction.
Fast azimuthal sweeping of radiation lobes is observed with varying optical frequency.
A frequency resolution of 230 MHz was demonstrated in the spectrometer setup.

Conclusions:

The proposed grating-fiber coupler array enables efficient frequency-dependent beam steering.
This technology shows promise for developing novel spectrometer designs.
The demonstrated frequency resolution highlights the potential for high-precision spectral measurements.