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Bandwidth Doubler Breakthrough Technology For Ultra-wide

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Cuttingedge technology R－1 Optoelectronics technology for accelerating ultrahigh capacity transmission Bandwidth doubler breakthrough technology for ultra-wide-band optical transmitter We are investigating optoelectronics technology for future ultrahigh-capacity optical communications systems. In this exhibit, we show a novel technique for doubling the transmitter bandwidth based on a digital preprocessor and an analog multiplexer. We succeeded in performing the record 160-Gb/s/λ optical transmission using this bandwidth-doubling technique. CMOS *1 DSP+DAC*2 provides flexible signal generation, but has limited signal bandwidth InP-HBT analog MUX enhances the signal bandwidth Features ■ Novel concept for extending the transmitter bandwidth based on a combination of digital and analog signal processing ■ InP-HBT-based analog circuit techniques for overcoming the bandwidth limitation of CMOS-based circuits ~20 GHz Digital preprocessor DSP ~40 GHz ~20 GHz DAC DAC CMOS Analog MUX： Ultrahigh-speed active switch circuit fabricated with in-house InP HBT *4 technology. Analog MUX *3 InP HBTs PAM4 ■ Demonstration of the world’s record 160-Gb/s PAM4 signal generation and optical transmission ■ Applicable to 1-Tb/s-class optical coherent systems Application Scenarios To optical （2bit） modulator signal 12.5 ps ■ Future ultrahigh-speed and ultrahigh-capacity optical transmitter (e.g. 1-Tb/s-class optical transmitter) 160Gb/s PAM4 *5 modulation （The world’s record speed） ■ Measuring instruments (e.g. ultrahigh-speed arbitrary waveform generator) t t *1 CMOS (Complementary Metal Oxide Semiconductor) , *2 DAC(Digital Analog Converter), *3 MUX（Multiplexer), *4 InP HBT (Indium Phosphide Heterojunction Bipolar Transistor) *5 PAM4 (4-level Pulse Amplitude Modulation) t 〈Contact〉[email protected] Copyright © 2016 NTT. All Rights Reserved.