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Optica Publishing Group
  • Journal of Lightwave Technology
  • Vol. 20,
  • Issue 8,
  • pp. 1500-
  • (2002)

High-Power Photonic Microwave Generation at K-and Ka-Bands Using a Uni-Traveling-Carrier Photodiode

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Abstract

A K-to Ka-band photonic microwave generator (PMG) consisting of a uni-traveling-carrier photodiode (UTC-PD) and a monolithically integrated bias circuit utilizing a 1/4-wavelength coplanar waveguide is presented. The device exhibits a high-saturation-output power of +14~dBm at 26 GHz for a bias voltage of -4~V. The output power is almost constant within a frequency range from 23 to 29 GHz. The 3-dB down bandwidth of the generator is as wide as 20 GHz, which is in good agreement with the circuit model calculation. Two types of devices, one with and one without a dc-cut capacitor, exhibit almost the same input-output characteristics. The device for the operation in the 38-GHz band is also fabricated, and it shows a maximum millimeter-wave (mm-wave) output power of +9~dBm. The PMG is suitable for the broad-band high-output fiber-radio applications.

[IEEE ]

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