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Photorefractive Beam splitter for Free-Space Optical Interconnections
Applied Optics
|February 21, 2008
Summary
A novel photorefractive beam splitter (PRBS) offers an alternative to polarizing beam splitters (PBS) for optical interconnections. This PRBS demonstrates superior transmission for off-axis beams in free-space optical systems.
Area of Science:
- Optics and Photonics
- Materials Science
Background:
- Free-space optical interconnection systems often use polarizing beam splitters (PBS) for power coupling.
- Existing PBS systems face challenges with uniform transmission, especially for off-axis beams.
Purpose of the Study:
- To introduce and evaluate a photorefractive beam splitter (PRBS) as an alternative to PBS.
- To assess the performance of PRBS in coupling optical power into reflective modulators.
Main Methods:
- A single diffraction grating recorded in a photorefractive material was used to create the PRBS.
- The PRBS redirects incident laser light into the first diffraction order for modulator coupling.
- Uncoupled reflected light, not meeting Bragg angle criteria, transmits through the PRBS.
Main Results:
- The PRBS effectively couples optical power into reflective modulators.
- Experimental results indicate better transmission for off-axis beams compared to PBS.
- The PRBS provides more uniform transmission for off-axis beams.
Conclusions:
- The photorefractive beam splitter (PRBS) is a viable and improved alternative to polarizing beam splitters (PBS).
- PRBS offers enhanced performance for free-space optical interconnections, particularly with off-axis beams.
