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Waveguide avalanche photodiodes (WG-APDs) have been developed for a 25-Gb/s operation. The waveguide structure was adopted for the APDs in order to achieve both high-speed performance and high responsivity. First, the dependence of the multiplication and absorption layer thickness on the 3-dB bandwidths of the WG-APDs was theoretically clarified. It was found that introducing an undepleted absorption...
We have developed mesa-structure avalanche photodiodes (MS-APDs) for Gb/s application. These MS-APDs combine high-speed peformance with the potential for low-cost productivity. Additionally, we realized high reliability of the mesa-structure APDs for the first time.
A 40-Gb/s receiver module with an InAlAs waveguide avalanche photodiode has developed for the first time. We have achieved the minimum received power of -18 dBm, which is the highest sensitivity ever reported without fiber amplifiers
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