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Related Experiment Video

Updated: Jun 14, 2026

Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping

Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping

Published on: March 20, 2017

Asynchronous detection of optical code division multiple access signals using a bandwidth-efficient and

Mable P Fok¹, Yanhua Deng, Paul R Prucnal

¹Lightwave Communications Laboratory, Department of Electrical Engineering, Princeton University, Princeton, New Jersey 08544, USA. mfok@princeton.edu

|April 6, 2010

Summary

This study introduces a new detection method for asynchronous optical code division multiple access (CDMA) signals. The novel scheme enables high-speed optical signal processing with standard baseband electronic receivers, mitigating interference and the near-far problem for error-free communication.

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Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping

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Quasi-light Storage for Optical Data Packets

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Published on: February 6, 2014

Area of Science:

Optical communications
Signal processing
Telecommunications engineering

Background:

Asynchronous optical code division multiple access (CDMA) systems face challenges with high chip rates and receiver bandwidth limitations.
Interfacing high-bandwidth optical signals with baseband electronic systems requires advanced detection schemes.
Multi-access interference and the near-far problem degrade performance in optical CDMA networks.

Purpose of the Study:

To demonstrate a novel detection scheme for asynchronous optical CDMA signals.
To enable interfacing high optical chip rates with baseband electronic clock and data recovery systems.
To mitigate multi-access interference and the near-far problem in optical CDMA.

Main Methods:

Utilizing a four-wave-mixing-based wavelength-aware all-optical front end to reject multi-access interference.
Employing a semiconductor optical amplifier for amplitude-noise suppression.
Converting the processed optical signal to a non-return-to-zero-like signal for baseband electronic detection.

Main Results:

Successful implementation of asynchronous transmission and detection of optical CDMA signals.
Demonstration of a detection scheme compatible with large optical bandwidth expansion factors.
Mitigation of the classic CDMA near-far problem, leading to easily obtained error-free detection.

Conclusions:

The proposed novel detection scheme effectively interfaces asynchronous optical CDMA signals with baseband electronic systems.
This method allows for high optical chip rates exceeding receiver bandwidths, enhancing system capacity.
The scheme successfully addresses key challenges in optical CDMA, enabling robust and error-free signal detection.