US Patent-TELEMETRY SYSTEM WITH TERAHERTZ FREQUENCY MULTIPLIER

United States Patent Application 20170198568
Nitsche, Wolfgang Hartmut (Humble, TX, US) 
Maida, John L. (Houston, TX, US) 
Bhongale, Satyan Gopal (Cypress, TX, US)

http://www.freepatentsonline.com/y2017/0198568.html

An example telemetry system for downhole operations in a subterranean formation comprises an electromagnetic (EM) radiation source and an EM radiation detector. A waveguide may be coupled to the EM radiation source and the EM radiation detector. A frequency multiplier may be coupled to the waveguide and positioned within a borehole in the subterranean formation.