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6 November 2009


3S’ directly modulated analog laser transmits at 19Gb/s over 25km of SMF

3S Photonics of Nozay, France says that a prototype of its 1915 LMA Series of directly modulated 1550nm high-bandwidth analog laser modules – launched at the 35th European Conference and Exhibition on Optical Communication (ECOC 2009) in Vienna, Austria (21-23 September) – has been successfully tested at 19Gb/s over 25km of single-mode fiber (SMF) without any chromatic dispersion compensation, and using the OFDM (orthogonal frequency division multiplexing) modulation format.

The prototype, presenting a 7GHz bandwidth and a +7dBm output power, was tested by Orange Labs in Lannion, France within the the telecom project EPOD — Enhanced PON (passive optical networks) using OF DM — 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).

3S says that a fully satisfactory 19Gbit/s transmission over a 25km single-mode optical fiber link was experimentally demonstrated using the discrete multi-tone (DMT) modulation format, which is already widely deployed for xDSL-type copper lines (digital subscriber line). The DMT signal contains 255 sub-carriers spread over 5GHz. Transmission was achieved without any chromatic dispersion compensation and with a 8.5GHz-bandwidth APD-based receiver module.

3S says that the promising experimental results reinforce the credibility of using OFDM modulation applied on a directly modulated analog laser module to design the next-generation of low-cost broadband optical access networks.

Additional tests are underway to demonstrate the 1915 LMA’s transmission capability at 40Gb/s.

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