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Spatial-phase code-division multiple-access system with multiplexed Fourier holography switching for reconfigurable

K Takasago, M Takekawa, A Shirakawa

|March 18, 2008

Summary

This study introduces a novel optical interconnection system using spatial-phase code-division multiple-access and multiplexed holography. It enables efficient, simultaneous routing of multiple optical signals with dynamic pattern control.

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Area of Science:

Optoelectronics
Optical Communications
Holography

Background:

Optical interconnection systems are crucial for high-speed data transfer.
Existing systems face challenges in scalability and dynamic routing capabilities.
Spatial-phase code-division multiple-access (SPCDMA) offers a potential solution for signal multiplexing.

Purpose of the Study:

To develop and demonstrate a novel space-variant optical interconnection system.
To leverage multiplexed Fourier holography for advanced signal routing.
To enable simultaneous routing of multiple optical signals with dynamic pattern control.

Main Methods:

Utilizing spatial-phase code-division multiple-access (SPCDMA) to spread signal beams across spatial frequencies using M-sequence pseudorandom phase codes.
Employing multiplexed Fourier holography to decode selected signal beams and shape their spatial patterns.
Recording Fourier holograms with encoded light matching the signal's phase mask and light shaped to the desired routing pattern.

Main Results:

Demonstrated a proof-of-principle experiment with a doubly multiplexed hologram capable of simultaneously routing two signal beams.
Showcased the ability to dynamically vary routing patterns by switching phase codes or replacing holograms.
Numerical modeling indicated the potential for managing over 250 routing patterns for a single signal flow using one multiplexed hologram at a signal-to-noise ratio of approximately 5.

Conclusions:

The proposed space-variant optical interconnection system effectively integrates SPCDMA and multiplexed Fourier holography.
This approach offers a flexible and scalable solution for simultaneous multi-signal routing in optical networks.
The system demonstrates significant potential for future high-capacity optical communication architectures.