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Mitsubishi Has Fast Diodes

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SUNNYVALE, Calif. -- The Semiconductor Division of Mitsubishi Electric & Electronics USA, Inc., today introduced the “ML9xx40 Series” of Distributed Feedback laser diodes (DFB-LD) for optical fiber communication. The ML9xx40 Series, which enables 2.5 Gbps-100km transmission in a zero to 85-degree C temperature range, is expected to be the top choice for optical fiber communication equipment due to its low cost, miniature size and low power consumption, a result achieved by eliminating temperature control. Unprecedented LD mass production is scheduled for late summer.

“Optical fiber communication traffic in metropolitan area networks is increasing with the growth of ADSL1 and FTTH2,” says Daniel Chen, vice president and general manager for the Semiconductor Division at Mitsubishi Electric US. “Since the transmission equipment used in these networks is increasingly shrinking in size and cost, our semiconductor laser diode, which operates without a cooler and performs well in high temperatures, will be in high demand. And with increasing traffic, higher bit rates (higher than 622Mbps or 1.25Gbps) will be required.”

The ML9xx40 Series provides stable, single wavelength operation under 2.5Gbps modulation over a wide temperature range because a quarter-wavelength phase-shifted grating is used in this DFB-LD. A transmission of up to 100km is possible at 1.55mm laser operation wavelength, where the optical power absorption in the optical fiber is minimum.

“Although operation up to 85 degrees C was difficult in a quarter-wavelength phase-shifted DFB-LD operated at 1.55mm wavelength, we succeeded by optimizing the device structure,” said Chen. “Because this DFB-LD has abundant characteristics under higher temperature, it performs well even in small transceiver equipment such as SFF3 and SFP4. Finally, low cost was achieved by utilizing standard TO-CAN packaging.”

1 Asymmetric Digital Subscriber Line
2 Fiber To The Home
3 Small Form Factor
4 Small Form Factor Pluggable

Mitsubishi Electric & Electronics USA Inc.

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