• J. H. Harris


A modulator is a device with an identifiable output optical wave whose amplitude and/or phase can be varied with the application of a modulating signal. There are a number of ways (see for example schematics of Fig. 1(a)–1(e)) in which modulation can be achieved. One method is to control the output of the optical source as occurs when the current in an injection laser is varied. Another is to alter the absorption properties of the material through optical bleaching or shifting an absorption band-edge by applying an electric field (Franz-Keldysh effect). The use of liquid crystals1 or mechanical techniques represent other possibilities. Some of these modulation methods provide viable options for communication systems. Direct modulation of a laser in particular may well evolve as the method of choice.


Propagation Constant Coupling Coefficient Optical Wave Double Arrow Injection Laser 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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Copyright information

© University of California 1974

Authors and Affiliations

  • J. H. Harris
    • 1
  1. 1.Electrical Engineering DepartmentUniversity of WashingtonUSA

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