DISTRIBUTED AMPLIFIER FOR FIBER-OPTIC COMMUNICATION SYSTEMS

We have developed distributed amplifiers for high bit-rate fiber-optic communication systems. We have designed a LiNbO3 modulator driver using 0.15-μm double-doped AlGaAs/InGaAs/AlGaAs pseudomorphic HEMTs. We obtained a 15-dB gain and 54-GHz bandwidth with GCPW lines, and a fairly clear 6-Vp-p output at 40 Gb/s. We also developed preamplifiers for both NRZ and NRZ applications. Our preamplifier for the NRZ-data format has a 52-dBΩ gain and a 49-GHz bandwidth. It consists of a lumped element circuit and a distributed amplifier with InP-based HEMTS. We fabricated a module that consisted of the preamplifier connected to a photodiode, and confirmed a clear NRZ-output waveform at 40-Gb/s. The preamplifier with 0.15-μm double-doped AlGaAs/lnGaAs/AlGaAs pseudomorphic HEMTs for the RZ-data format has an 11-dB gain and a 57-GHz bandwidth. We also developed a PIN/preamp module that has a 44-dBΩ gain and a 45-GHz bandwidth. The module showed a superior phase characteristic and produced a clear RZ eye-pattern. Furthermore, we fabricated an ultra-broadband amplifier for over-40-Gb/s applications. We obtained a 9-dB gain and 70-GHz bandwidth. These results demonstrate that a distributed amplifier is the best candidate for over-40-Gb/s fiber optic communication systems.manuscript.

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