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A high-speed, monolithic GaInAs twin-pin photodiode has been fabricated for balanced optical coherent receiver applications. A very small capacitance of 80 fF, a high quantum efficiency of 80% and -3 dB cutoff frequency of more than 13 GHz have been achieved. An intensity modulation suppression of -30 dB has been measured up to 7 GHz, which provides evidence of an excellent balance between the characteristics of the two photodiodes.
Date of Publication: 17 Aug. 1989