High-Speed Frequency Modulated DBR Lasers for Long-Reach Transmission

Takaaki KAKITSUKA  Shinji MATSUO  

IEICE TRANSACTIONS on Electronics   Vol.E92-C   No.7   pp.929-936
Publication Date: 2009/07/01
Online ISSN: 1745-1353
DOI: 10.1587/transele.E92.C.929
Print ISSN: 0916-8516
Type of Manuscript: INVITED PAPER (Special Section on Recent Advances in Ultra-high-speed Photonic Devices for Next-generation Optical Fiber Communications)
DBR laser,  frequency modulation,  FM/AM conversion,  optical filter,  

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We present a novel high-speed transmitter consisting of a frequency modulated DBR laser and optical filters. The refractive index modulation in the phase control region of the DBR laser allows high-speed frequency modulation. The generated frequency modulated signal is converted to an intensity modulated signal using the edge of the optical filter pass band. We present theoretical simulations of high-speed modulation characteristics and extension of transmission reach. With the proposed transmitter, we review the experimental demonstration of 180-km transmission of a 10-Gb/s signal with a tuning range of 27 nm and 60-km transmission of a 20-Gb/s signal.