Low Driving Voltage Operation of MZI-Type EA Modulator Integrated With DFB Laser Using Optical Absorption and Interferometric Extinction
| Autor: | Wataru Kobayashi, Shigeru Kanazawa, Takeshi Fujisawa, Masaki Kohtoku, Hiroaki Sanjoh, Kiyoto Takahata, Yuta Ueda, Hiroyuki Ishii |
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| Rok vydání: | 2015 |
| Předmět: |
Physics
Distributed feedback laser Extinction ratio business.industry Type (model theory) Optical modulation amplitude Laser Atomic and Molecular Physics and Optics Semiconductor laser theory law.invention Light intensity Optics law Optoelectronics Laser power scaling Electrical and Electronic Engineering business |
| Zdroj: | IEEE Journal of Selected Topics in Quantum Electronics. 21:195-200 |
| ISSN: | 1558-4542 1077-260X |
| Popis: | We have developed a novel electroabsorption modulator (EAM)-integrated distributed feedback laser (EA-DFB laser), in which an EAM functioning as an external modulator is integrated in a Mach–Zehnder interferometer (MZI). The MZI-type EAM (MZEA) modulates light intensity by both optical absorption and interferometric extinction. As a result, it improves the extinction ratio (ER) of a conventional EAM, which allows us to reduce the modulation voltage ( $V_{{\rm m}}$ ), and thus reduce the power consumption of the driver circuit. A fabricated MZEA-integrated DFB laser (MZEA-DFB laser) exhibited high-ER operation and an output power of about 8 dBm, which is comparable to that of a conventional EA-DFB laser, with a 100-mA laser current. Thanks to the high ER and sufficient output power, the MZEA-DFB laser operating at half the $V_{{\rm m}}$ of a conventional EA-DFB laser is able to generate optical signals with a given optical modulation amplitude, and we achieved a 25.8-Gb/s 40-km transmission with the novel laser at a $V_{{\rm m}}$ of $1 {\rm V_{pp}}$ . |
| Databáze: | OpenAIRE |
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