News

22 September 2009

 

3S showcases prototype directly modulated 1550nm analog laser module for broadband access

At the 35th European Conference and Exhibition on Optical Communication (ECOC 2009) in Vienna, Austria, 3S Photonics of Nozay, France is showcasing a prototype of its 1915 LMA Series of next-generation directly modulated 1550nm high-bandwidth analog laser modules, which are optimized for the high-spectral-efficiency formats OFDM/QAM (orthogonal frequency division multiplexing/quadrature amplitude modulation).

Powered by the firm’s in-house 1550nm high-bandwidth analog DFB laser chip (optimized for direct modulation), the 1915 LMA has been developed by 3S specifically for the telecom project EPOD - Enhanced PON (passive optical networks) using the OF DM modulation format - which is sponsored by France’s National Research Agency (ANR) and is planned to last 24 months (after beginning in early February 2009). EPOD is led by Orange Labs (the R&D division of the French telecom provider) and, as well as 3S, also embraces academic partners including LISIF (Laboratories of Electronics and Electromagnetism – L2E of the Paris region) and a research team from XLIM (a research institute held jointly between University of Limoges and CNRS).

The 1550nm analog laser module has a high ex-fiber optical output power (>10mW) and a very low RIN (<-160dB/Hz for frequencies up to 18GHz), enabling the transmission of analog signals within an ultra-wide bandwidth from 10MHz to 20GHz over more than 20km of single-mode fiber.

Using an industry-standard butterfly package with GPO connector as RF input, the module is intended for the distribution and/or the transmission of radio-type signals through broadband fiber links such as radio-over-fiber (RoF), RF over glass (RFoG) or fiber-to-the-antenna (FTTA) applications.

“The purpose was to try to imagine what the next-generation access networks could or should be to overcome the expected bandwidth bottleneck due to the emergence of new Internet services,” explains board member & chief technology officer Didier Sauvage. “With our partners within EPOD, we have explored the transmission performances of our 1915 LMA analog laser modules through the use of OFDM modulation format.” The firm’s objective is to take part in the evolution of access networks providing low-cost high performance optoelectronic technologies. “1915 LMA development is a key step forward for this project,” he adds.

“When directly modulated with the OFDM technique – the one implemented in xDSL transmission - the 1915 LMA represents a perfect transmitter candidate for the next-generation of broadband optical access networks, meeting all the stringent requirements set by the convergence of metro and access, i.e. low cost, mature technology, high bit rate and extended reach,” claims Yannick Bailly, VP marketing & product management.

R&D prototypes of the 1915 LMA are currently being tested within the ALPHA European project. The performance of the 1915 LMA will be presented by Orange Labs in the technical conference at ECOC (Wednesday 23 September, Group 7.5: High Bit Rate PON).

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