Lasers, Fiber Optics, and Communications

Viterbi equalization for long-distance, high-speed underwater laser communication

[+] Author Affiliations
Siqi Hu, Le Mi

Chinese Academy of Sciences, Shanghai Institute of Optics and Fine Mechanics, Key Laboratory of Space Laser Communication and Detection Technology, Jiading District, Shanghai, China

University of Chinese Academy of Sciences, Shijingshan District, Beijing, China

Tianhua Zhou, Weibiao Chen

Chinese Academy of Sciences, Shanghai Institute of Optics and Fine Mechanics, Key Laboratory of Space Laser Communication and Detection Technology, Jiading District, Shanghai, China

Opt. Eng. 56(7), 076101 (Jul 11, 2017). doi:10.1117/1.OE.56.7.076101
History: Received February 26, 2017; Accepted June 19, 2017
Text Size: A A A

Abstract.  In long-distance, high-speed underwater laser communication, because of the strong absorption and scattering processes, the laser pulse is stretched with the increase in communication distance and the decrease in water clarity. The maximum communication bandwidth is limited by laser-pulse stretching. Improving the communication rate increases the intersymbol interference (ISI). To reduce the effect of ISI, the Viterbi equalization (VE) algorithm is used to estimate the maximum-likelihood receiving sequence. The Monte Carlo method is used to simulate the stretching of the received laser pulse and the maximum communication rate at a wavelength of 532 nm in Jerlov IB and Jerlov II water channels with communication distances of 80, 100, and 130 m, respectively. The high-data rate communication performance for the VE and hard-decision algorithms is compared. The simulation results show that the VE algorithm can be used to reduce the ISI by selecting the minimum error path. The trade-off between the high-data rate communication performance and minor bit-error rate performance loss makes VE a promising option for applications in long-distance, high-speed underwater laser communication systems.

Figures in this Article
© 2017 Society of Photo-Optical Instrumentation Engineers

Citation

Siqi Hu ; Le Mi ; Tianhua Zhou and Weibiao Chen
"Viterbi equalization for long-distance, high-speed underwater laser communication", Opt. Eng. 56(7), 076101 (Jul 11, 2017). ; http://dx.doi.org/10.1117/1.OE.56.7.076101


Access This Article
Sign in or Create a personal account to Buy this article ($20 for members, $25 for non-members).

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging & repositioning the boxes below.

Related Book Chapters

Topic Collections

Advertisement


 

  • Don't have an account?
  • Subscribe to the SPIE Digital Library
  • Create a FREE account to sign up for Digital Library content alerts and gain access to institutional subscriptions remotely.
Access This Article
Sign in or Create a personal account to Buy this article ($20 for members, $25 for non-members).
Access This Proceeding
Sign in or Create a personal account to Buy this article ($15 for members, $18 for non-members).
Access This Chapter

Access to SPIE eBooks is limited to subscribing institutions and is not available as part of a personal subscription. Print or electronic versions of individual SPIE books may be purchased via SPIE.org.