Distributed Balanced Photodetectors for Broad-Band Noise Suppression
نویسندگان
چکیده
A novel velocity-matched distributed balanced photodetector with a 50coplanar 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 commonmode 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.
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Figure l(b) shows the wavelength-dependent time delay under different stretching voltages. The slope of the curve (i.e., the dispersion) at the operating laser wavelength can be changed by varying the PZT voltage. This grating enables compensation of dispersion accumulated for various distances as well as the dispersion accumulated in multiple subcarriers. Figures 2(a) and 2(b) show the effect ...
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