Title :
Efficient generation of guided millimeter-wave power by photomixing
Author :
Huggard, P.G. ; Ellison, B.N. ; Shen, P. ; Gomes, N.J. ; Davies, P.A. ; Shillue, W.P. ; Vaccari, A. ; Payne, J.M.
Author_Institution :
Rutherford Appleton Lab., Didcot, UK
Abstract :
A 70-GHz bandwidth commercial photodiode has been coupled to W-band waveguide and used as a photomixing source from 75 to 170 GHz. Maximum power conversion efficiency of 1.8% was obtained at 75 GHz, where an optical input of +10 dBm yielded a nonsaturated millimeter-wave (mm-wave) power of -7.5 dBm. Optimizing the photomixer backshort tuning at individual frequencies showed that the mm-wave power decreased with frequency to a level of -30 dBm at 170 GHz. Fixed tuning allowed the generation of power across the full waveguide band from 75 to 110 GHz, with a variation within 5 dB across the majority of the band.
Keywords :
high-speed optical techniques; microwave photonics; millimetre wave couplers; millimetre wave generation; multiwave mixing; optical tuning; optical wavelength conversion; photodiodes; waveguide couplers; 1.8 percent; 70 GHz; 75 to 110 GHz; 75 to 170 GHz; W-band waveguide coupled photodiode; fixed tuning; guided millimeter-wave power generation; millimeter-wave waveguides; mm-wave power; mm-wave power generation; nonsaturated millimeter-wave power; nonsaturated mm-wave power; optical input; photomixer backshort tuning optimization; photomixing; photomixing source; power conversion efficiency; ultrafast electronics; Bandwidth; Frequency; Millimeter wave transistors; Optical tuning; Optical waveguides; Phased arrays; Photodiodes; Power generation; Radio astronomy; Ultrafast optics;
Journal_Title :
Photonics Technology Letters, IEEE
