High bandwidth, optical fiber delay line multichannel digital correlator.

Area of Science:

• Photonics
• Electrical Engineering
• Signal Processing

Background:

• Current electronic correlators face limitations in real-time bandwidth.
• High-speed digital correlation is crucial for various scientific and engineering fields.

Purpose of the Study:

• To implement and demonstrate a multichannel digital correlator using passive optical fiber delay lines.
• To explore the potential of optical methods for achieving higher bandwidths in digital correlation.

Main Methods:

• Utilized passive optical fiber delay lines for multichannel signal correlation.
• Employed laser diodes and optoelectronic single-bit AND multipliers for digital correlation.
• Tested configurations with eight channels at 100 MHz and four channels at 500 MHz sample rates.

Main Results:

• Achieved higher real-time bandwidths compared to purely electronic correlators.
• Demonstrated digital correlation with eight channels at 100 MHz and four channels at 500 MHz.
• Identified suitability of low-cost 800 nm optoelectronics for up to 1 GHz sample rates.

Conclusions:

• Passive optical fiber delay lines offer a viable path to significantly enhance digital correlator bandwidth.
• The developed optical correlator shows promise for applications requiring high-speed signal processing.
• Future all-optical architectures could lead to more compact and efficient correlator designs.