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Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator

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Spectrally efficient slow light using multilevel phase-modulated formats.

Bo Zhang¹, Lianshan Yan, Lin Zhang

¹Department of Electrical Engineering-Systems, University of Southern California, 3740 McClintock Avenue EEB 500, Los Angeles, California 90089, USA. boz@usc.edu

|December 25, 2007

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Advanced multilevel phase-modulated formats enable spectrally efficient slow-light communication. This method achieved a 60 ps symbol delay for 10 Gbit/s differential quadrature phase shift keying (DQPSK) signals, demonstrating error-free transmission.

Area of Science:

Photonics
Optical Communications
Signal Processing

Background:

Slow-light technology offers potential for optical buffering and signal processing.
Multilevel phase-modulated formats enhance spectral efficiency in optical communication systems.
Differential quadrature phase-shift keying (DQPSK) is a high-order modulation format for increased data rates.

Purpose of the Study:

To propose and experimentally demonstrate a phase-preserving and spectrally efficient slow-light scheme.
To investigate the feasibility of transmitting high-order modulation formats through slow-light media.
To achieve significant symbol delays with error-free signal demodulation.

Main Methods:

Utilizing advanced multilevel phase-modulated formats.

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Related Experiment Videos

Last Updated: Jul 8, 2026

Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator

Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator

Published on: January 28, 2019

Quasi-light Storage for Optical Data Packets

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Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping

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Employing a broadband stimulated Brillouin scattering-based slow-light medium.

Experimentally demonstrating a 60 ps symbol delay for 10 Gbit/s return-to-zero DQPSK signals.

Main Results:

Achieved a 60 ps symbol delay with error-free demodulation of both I and Q channels for 10 Gbit/s DQPSK signals.
Demonstrated the successful transmission of high spectral efficiency multilevel formats through a slow-light medium.
Simulation results indicate potential for 20 Gbit/s DQPSK and 30 Gbit/s D8PSK transmission.

Conclusions:

The proposed phase-preserving slow-light scheme is effective for spectrally efficient multilevel formats.
Stimulated Brillouin scattering provides a viable medium for achieving significant slow-light delays.
This approach holds promise for future high-capacity optical communication systems.