Signal Processing

The realization of suitable high-speed digital-to-analog converters, analog-to-digital converters, and digital signal processors has allowed advanced signal processing to offer substantial improvements in the performance and functionality of fiber-optic communication systems. In the transmitter, appropriate drive signals for an optical modulator are synthesized using digital signal processing and digital-to-analog conversion. This permits the generation of modulated optical signals with unprecedented control of the time-varying amplitude and phase. The transmitted signal can be pre-compensated to account for fiber dispersion, fiber nonlinear effects, and the filtering of reconfigurable optical add-drop multiplexers. In the receiver, the combination of coherent detection, analog-to-digital conversion, and digital signal processing is a particularly powerful approach. Coherent detection preserves both the amplitude and phase of the received optical signal in the photo-detected signal. This allows for post-compensation using digital signal processing that effectively mitigates linear transmission impairments and implements key receiver functions.

Topics currently being investigated include the following:

  • digital signal processing for transmitters and receivers in coherent optical fiber transmission systems,
  • techniques for assessing the implications of transmission impairments on system performance,
  • signal processing algorithms for compensating transmission impairments, and
  • spectrally efficient modulation formats including constellation shaping.

Research Funding

Current research activities are supported by:

Natural Sciences and Engineering Research Council



John C. Cartledge

Department of Electrical and Computer Engineering
Queen's University
Kingston, ON K7L 3N6

Telephone: 613-533-2935

Applying for Graduate Programs



J. C. Cartledge

Members of LSRL

M. Bagheri, Ph.D. program

H. Miller, Ph.D. program

A. S. Kashi, Postdoctoral Fellow

Graduates of LSRL

R. D. Bespalko, M.Sc.(Eng) and Ph.D.

S.-H. Chung, Ph.D.

N. Deb, Ph.D.

C. Doggart, M.A.Sc.

A. I. Abd El-Rahman, Ph.D.

A. Gallant, M.Sc.(Eng)

Ying Gao, PDF

Yuliang Gao, PDF

J. D. Gaudette, M.Sc.(Eng)

C. J. S. Ito, Ph.D.

A. Jain, PDF

Y. Jiang, Ph.D.

A. S. Karar, Ph.D. and PDF

A. S. Kashi, Ph.D.

J. H. Ke, PDF

D. J. Krause, Ph.D. and PDF

L. Li, VRS

I. Monfils, Ph.D.

M. Owsiak, M.Sc.(Eng)

M. A. Rezania, Ph.D.

X.-F. Tang, PDF

P. Wang, M.A.Sc.

M. Yanez, Ph.D. and PDF

K. Zanette, M.A.Sc.

S. Zhang, Ph.D.

K. P. Zhong, VRS