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Large angular dispersion by a virtually imaged phased array and its application to a wavelength demultiplexer.

|October 30, 2009

Summary

A novel optical scheme utilizes a virtually imaged phased array (VIPA) to achieve significantly larger angular dispersion. This method enables efficient 10-channel wavelength demultiplexing with minimal polarization dependence.

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Area of Science:

Optics
Photonics
Optical Engineering

Background:

Diffraction gratings are commonly used for wavelength dispersion but have limitations.
Achieving high angular dispersion is crucial for compact and efficient optical systems.

Purpose of the Study:

To propose and demonstrate a new optical scheme for enhanced angular dispersion.
To utilize a virtually imaged phased array (VIPA) for improved wavelength demultiplexing.

Main Methods:

Implementation of a virtually imaged phased array (VIPA) as the core component.
Experimental demonstration of wavelength demultiplexing for multiple channels.

Main Results:

The VIPA exhibits 10-20 times greater angular dispersion compared to conventional diffraction gratings.
Successful wavelength demultiplexing of 10 channels with a 0.8-nm spacing was achieved.
Low polarization-state dependence of approximately 0.1 dB was confirmed.

Conclusions:

The proposed VIPA-based scheme offers a significant advancement in optical angular dispersion.
This method provides an efficient solution for dense wavelength-division multiplexing applications.
The low polarization dependence makes the system robust for practical use.