Title :
Distributed balanced photodetectors for broad-band noise suppression
Author :
Islam, M. Saiful ; Chau, Tai ; Mathai, Sagi ; Itoh, Tatsuo ; Wu, Ming C. ; Sivco, Deborah L. ; Cho, Alfred Y.
Author_Institution :
Dept. of Electr. Eng., California Univ., Los Angeles, CA, USA
fDate :
7/1/1999 12:00:00 AM
Abstract :
A novel velocity-matched distributed balanced photodetector with a 50-Ω coplanar waveguide output transmission line has been experimentally demonstrated in the InP/InGaAs material system. Distributed absorption and velocity matching are employed to increase the saturation photocurrent. A common-mode rejection ratio greater than 27 dB has been achieved. The radio-frequency (RF) link experiment conducted at 4.16 GHz shows that the relative intensity noise of the laser has been suppressed by more than 24 dB and shot-noise limited performance has been achieved. Significant improvement of signal-to-noise ratio has been observed over a wide range of frequencies and phase mismatch of input RF signals
Keywords :
III-V semiconductors; gallium arsenide; indium compounds; microwave photonics; optical fibre communication; optical noise; optical receivers; photodetectors; 4.16 GHz; 50 ohm; InP-InGaAs; broad-band noise suppression; common-mode rejection ratio; coplanar waveguide output transmission line; distributed absorption; phase mismatch; relative intensity noise; saturation photocurrent; shot-noise limited performance; signal-to-noise ratio; velocity-matched distributed balanced photodetector; Conducting materials; Coplanar transmission lines; Coplanar waveguides; Electromagnetic wave absorption; Indium gallium arsenide; Indium phosphide; Optical materials; Photoconductivity; Photodetectors; Radio frequency;
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
