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Uncooled DFB laser exhibits linearity up to 85C

Posted: 13 Mar 2003 ?? ?Print Version ?Bookmark and Share

Keywords:bookham technology? Cambridge university? dfb laser? uncooled dfb laser? directly modulated laser?

Engineers from Bookham Technology plc and the Cambridge University Department of Engineering have announced the development of a directly modulated DFB laser that exhibits wide bandwidth with high linearity over the 25C to 85C temperature range without cooling.

"The big advantage of going to uncooled directly modulated lasers is they are cheaper, more compact and more efficient," said Kenton White, Advisor, Modulated Sources Technology, Bookham Technology. "Typically, you can take up to a watt of power consumption off, and, in terms of packaging, I would say there is a factor of two in area reduction in removing the cooler - perhaps even more."

"And, of course, you don't need an expensive, and potentially complex, external modulator taking up more space and power," White added.

The laser is designed to facilitate the direct transport of analog microwave/RF signals over fiber for inbuilding distributed antenna systems in cellular networks, as well as in WLAN systems such as IEEE 802.11-based networks and HiperLAN.

The InP-based compressively-strained multiple-quantum-well DFB laser incorporates a semi-insulating buried heterostructure for improved thermal performance. At 25C, it has an SFDR >103dB (1GHz to 20GHz range), while at 85C, it exhibits an SFDR >90dB (1GHz to 10GHz). Third-order intermodulation products are typically -60dB over the entire 1GHz to 20GHz range.

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