Abstract
The increased absorption volume of traveling wave distributed photodetectors can be used for high power generation without bandwidth reduction. In these traveling wave photodetectors, in order to not be limited by round-trip bandwidth limit, half of the generated photocurrent, which is traveling towards the input end, has to be absorbed in an input termination. We propose cancellation of the backward propagating current by using a multi-section transmission line to eliminate this loss. The impedances of the individual transmission line sections are chosen such that the backward current (traveling towards input end) generated by each of the diodes is canceled by the reflected fraction of the forward current (traveling towards output end) generated by the preceding diodes. With backward wave cancellation, RF response increases by up to 6dB while maintaining high-bandwidth. We present here the experimental results of a traveling-wave-backward-wave-cancelled photodetector with 38GHz bandwidth and up to -1dBm of linear RF output at 40GHz.
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