The case for free space

Katsutoshi Tsukamoto*, Akira Hashimoto, Yuji Aburakawa, Mitsuji Matsumoto

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

36 Citations (Scopus)


Free space optical links (FSOL) applications have been considered as a potential medium to provide short range links using simple and compact equipment. The development of radio on free-space optical links (RoFSOLs) has also proved effective as a short link. In RoFSOLs, some radio on fiber signals are directly transmitted from an optical fiber into air. This can provide a free-space link for various types of wireless services in an optical wireless beam similar to RoF. RoFSOLs can provide another method to extend mobile network infrastructure, where radio signals from a base station analog-modulate an optical signal at a radio-to-optical signal converter (R/O) using a laser diode or a optical external modulator. RoFSOLs without fiber or a combination of RoF and RoFSOLs are suitable for universal backhaul link and a universal access point for heterogeneous wireless services. RoFSOLs, in combination with WDM technology, can provide shared backhaul for flexible deployment of various wireless services operating in different radio frequency bands.

Original languageEnglish
Article number5185528
Pages (from-to)84-92
Number of pages9
JournalIEEE Microwave Magazine
Issue number5
Publication statusPublished - 2009 Aug

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Radiation
  • Condensed Matter Physics


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