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EA-DFB Lasers Demo'd
Mar 2008
Opnext Inc. and Hitachi Ltd. announced the first wide-temperature range operation of 1310-nm 25 Gb/s EA-DFB (electro-absorption modulator with integrated distributed feedback) lasers for 100 Gigabit Ethernet 10-km, single-mode fiber (SMF) application at OFC/NFOEC 2008, held in February in San Diego.

"A study by the IEEE High-Speed Study Group showed that by the year 2010, the bandwidth required in core networking will be best satisfied by 100Gbit/s interfaces," Opnext said in a statement. "Furthermore, bandwidth needs are expected to double every 18 months, resulting in demand for multiport 100 Gb/s systems. In the IEEE 802.3ba taskforce, a 10-km SMF (single mode fiber) 100 Gigabit Ethernet specification is being discussed. For this application, 1310-nm four channels by 25 Gb/s wavelength division multiplexing transmission is the most attractive technology. One of the technology challenges is to achieve 1310-nm 25 Gb/s WDM optical devices. Course wavelength division multiplexing (CWDM) technology is expected to be the most cost-effective solution due to the wide wavelength pitch that enables 100 percent of wavelength yield and less strict or no temperature control."

Hitachi and Opnext said they have demonstrated EA-DFB lasers operating at 25 Gb/s with wavelengths of 1290-, 1310-, 1330- and 1350-nm. The 25 Gb/s operation was achieved using high-speed device technology, which has been already confirmed in 1550-nm 40 Gb/s EA-DFB lasers that are currently used commercially in 40 Gb/s transceivers. A wide temperature range operation from 0 ºC to 85 ºC was also reported. This was achieved using advanced aluminum-based material system in the EA modulator section, the companys said. The semiconductor material system has a temperature tolerant bandgap structure that decreases the temperature-dependent performance of the modulator.

"These EA-DFB lasers demonstrate the technical feasibility of the CWDM grid that achieves low-cost 100 G b/s optical transceiver modules with low power consumption and compact size, which is expected to accelerate the adoption of 100 Gb/s interfaces in the network," Opnext said.

Masahiko Aoki, a researcher at Hitachi's Central Research Laboratories, said, “The demonstrated 25 Gb/s 1310-nm CWDM EA-DFB lasers were achieved based on Hitachi’s advanced technology for uncooled and high-speed lasers which has already been demonstrated in previous work of uncooled 10 Gb/s and cooled 40 G bt/s EA-DFB lasers. We believe uncooled operation is the key to achieve small- and low-cost 100 Gigabit Ethernet transceivers for LAN applications.”

A post-deadline paper describing the results was presented at OFC/NFOEC 2008, held in February in San Diego.

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The technology of generating and harnessing light and other forms of radiant energy whose quantum unit is the photon. The science includes light emission, transmission, deflection, amplification and detection by optical components and instruments, lasers and other light sources, fiber optics, electro-optical instrumentation, related hardware and electronics, and sophisticated systems. The range of applications of photonics extends from energy generation to detection to communications and...
100 Gigabit EthernetCommunicationsEA-DFB laserselectro-absorption modulatorfiber opticsHitachiindustrialIndustry Eventsintegrated distributed feedbackOpnextphotonicssingle-mode fiber

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