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Journal of Lightwave Technology

Journal of Lightwave Technology


  • Vol. 32, Iss. 1 — Jan. 1, 2014
  • pp: 3–9

Design and Fabrication of Wide Wavelength Range 25.8-Gb/S, 1.3-μM, Push-Pull-Driven DMLs

Wataru Kobayashi, Takeshi Fujisawa, Ken Tsuzuki, Yoshitaka Ohiso, Toshio Ito, Shigeru Kanazawa, Takayuki Yamanaka, and Hiroaki Sanjoh

Journal of Lightwave Technology, Vol. 32, Issue 1, pp. 3-9 (2014)

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We design and fabricate wide wavelength range directly modulated lasers (DMLs) on the same InP wafer to realize a large-capacity monolithically integrated light source array up to 1 Tb/s. We demonstrate a 25.8-Gb/s push–pull operation over a 30-nm wavelength range, which is conventionally about 14 nm for 100 GbE applications. To extend the operating wavelength range, we design the wavelength dependence of the differential gain $(\partial {\rm G}/\partial {\rm n})$ for an InGaAlAs multiple quantum well structure, and realize high frequency relaxation oscillation resulting from the high differential gain over a wide range. Next, we also design the wavelength detuning (Δλ) under an operating injection current condition by taking account of the thermal effect of the chip, because Δλ determines $\partial {\rm G}/\partial {\rm n}$ , and the threshold current of the laser diode (LD). In addition, to achieve a 25.8-Gb/s push–pull operation, we fabricate a ridge waveguide structure buried in benzocyclobutene (BCB) with a low parasitic capacitance, and electrically isolate the DML from the neighboring chip by etching off n-InP. By using this design and structure, we achieve a 3-dB-down frequency bandwidth of over 20 GHz from 1290 to 1320 nm. We also achieve a mean output power of 8.0 dBm, and a dynamic extinction ratio of 5 dB. We measure the 25.8-Gb/s transmission characteristics, and obtain clear eye openings for a back-to-back configuration. We also measure the bit-error-rate performance, and obtain error-free operation for a 30-nm operating wavelength range.

© 2013 IEEE

Wataru Kobayashi, Takeshi Fujisawa, Ken Tsuzuki, Yoshitaka Ohiso, Toshio Ito, Shigeru Kanazawa, Takayuki Yamanaka, and Hiroaki Sanjoh, "Design and Fabrication of Wide Wavelength Range 25.8-Gb/S, 1.3-μM, Push-Pull-Driven DMLs," J. Lightwave Technol. 32, 3-9 (2014)

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