Analog photonic link by using DFB lasers operated in the low laser threshold current region and external modulation

A. García-Juárez*, I. E. Zaldívar-Huerta, J. Rodríguez-Asomoza, R. Gómez-Colín, A. G. Rojas-Hernández, D. Berman-Mendoza, R. Gómez-Fuentes, A. Vera Marquina.

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

2 Scopus citations


In this paper we describe an analog microwave photonic link system used to transmit simultaneously two TV signals. The experimental setup is composed mainly by two distributed feedback (DFB) laser diodes emitting at 1500 nm. When DFB lasers are operated in the low laser threshold current region, relaxation oscillation frequencies are obtained. Relaxation oscillations in the laser intensity can be seen as sidebands on both sides of the main laser line. The optical emissions generated in each laser are combined and amplified by using an Erbium-Doped Fiber Amplifier (EDFA). Next, the amplified optical signal is detected by a fast photo-detector using direct detection method and as result of this photo-detection microwave signals are generated. Microwave signals obtained by this technique are used as electrical carriers to transmit analog TV signals over 30 km of standard optical fiber by using a Mach-Zehnder modulator (MZM). At the end of the optical link the modulated light is photo-detected in order to recover efficiently and successfully the analog TV signals.

Original languageEnglish
Title of host publicationBroadband Access Communication Technologies VI
StatePublished - 2012
EventBroadband Access Communication Technologies VI - San Francisco, CA, United States
Duration: 24 Jan 201226 Jan 2012

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X


ConferenceBroadband Access Communication Technologies VI
Country/TerritoryUnited States
CitySan Francisco, CA


  • Direct detection
  • Distributed Feedback Laser (DFB)
  • IMDD RoF Systems
  • Microwave carriers
  • Microwave generation
  • Microwave photonics
  • Relaxation oscillation frequency
  • Threshold current


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