Five-gigabit/s performance of integrated light sources consisting of λ/4 shifted DFB laser and E-A modulator with S.I. InP BH structure

Hideaki Tanaka*, Masatoshi Suzuki, Hidenori Taga, Masashi Usami, Shu Yamamoto, Yuichi Matsushima

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution


The device considered was fabricated using a three-step growth procedure and a selective Zn-diffusion process. For the integrated device consisting of a 350-μm-long laser and a 400-μm-long modulator, the 3-dB bandwidth was 8 GHz. The response was fully flat, and the relaxation oscillation resonance of the laser was sufficiently suppressed due to nearly complete electrical isolation between the laser and modulator. The bit error rate (BER) characteristics were measured under 5-Gb/s NRZ pseudorandom modulation, and error-free operation was confirmed. Five-gigabit-per-second transmission experiments were performed using conventional single-mode fiber with zero dispersion at a 1.3-μm wavelength. The modulator of the integrated device was driven by a 5-Gb/s NRZ signal of a (1,0) fixed pattern. The extinction ratio was 6 dB. Output from the modulator was coupled into the single-mode fiber by a lensed fiber. The BER characteristics are shown. Five-gigabit-per-second, 73-km transmission was successfully achieved with no error floor in spite of large (1467-ps/nm) dispersion. The power penalty was 2.7 dB at a BER of 10-9 after 73-km transmission. However, the estimated power penalty from spectral burdening caused by the α parameter was much smaller than the measured value.

Original languageEnglish
Title of host publicationTechnical Digest Series
Place of PublicationWashington, DC, United States
PublisherPubl by Optical Soc of America
Number of pages1
ISBN (Print)1557521123
Publication statusPublished - 1990
Externally publishedYes
Event1990 Optical Fiber Communications Conference - OFC'90 - San Francisco, CA, USA
Duration: 1990 Jan 221990 Jan 26


Other1990 Optical Fiber Communications Conference - OFC'90
CitySan Francisco, CA, USA

ASJC Scopus subject areas

  • Engineering(all)


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