Abstract
We demonstrate hermetically packaged InGaAs/InP photodetector modules for high performance microwave
photonic applications. The devices employ an advanced photodiode epitaxial layer known as the modified uni-traveling
carrier photodiode (MUTC-PD) with superior performance in terms of output power and saturation. To further improve the
thermal limitations, the MUTC-PDs were flip-chip bonded on high thermal conductivity substrates such as Aluminum
Nitride (AlN) and Diamond. Modules using chips with active area diameters of 40, 28, and 20 μm were developed.
The modules demonstrated a 3-dB bandwidth ranging from 17 GHz up to 30 GHz. In continuous wave mode of
operation, very high RF output power was achieved with 25 dBm at 10 GHz, 22 dBm at 20 GHz, and 17 dBm at
30 GHz. In addition, the linearity of the modules was characterized by using the third order intercept point
(OIP3) as a figure of merit. Very high values of OIP3 were obtained with 30 dBm at 10 GHz, 25 dBm at 20 GHz
and more than 20 dBm at 30 GHz. Under short pulse illumination conditions and by selectively filtering the
10 GHz frequency component only, a saturated power of >21 dBm was also measured. A very low AM-to-PM
conversion coefficient was measured, making the modules highly suitable for integration in photonic systems for
ultralow phase noise RF signal generation.
© 2014 IEEE
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