FEBRUARY 28, 2008 -- Alcatel-Lucent (search for Alcatel-Lucent) has announced, in four post-deadline papers accepted at OFC/NFOEC in San Diego, CA, a new optical transmission record and three new photonic integrated circuits.
Bell Labs (search for Bell Labs) researchers, in partnership with Alcatel-Thales' III-V Lab and the optical solution company Kylia (search for Kylia), have achieved successful transmission of 16.4 Tbits/sec of optical data over 2,550 km. This transmission was achieved using 164 WDM channels modulated at 100 Gbits/sec and, says Alcatel-Lucent, represents a world record for capacity x distance at 41.8 Petabits/sec*km.
Several new technologies were used, including a highly linear, balanced optoelectronic photoreceiver and an ultracompact, temperature-insensitive coherent mixer. This result is a critical step forward in enabling 100-Gbit/sec Ethernet, says the company. It ensures the maximum exploitation of the fiber bandwidth to cope with future capacity needs by providing very high information spectral density at 2 bits/sec/Hz.
Three papers from Bell Labs researchers at Holmdel, NJ, were accepted for the conference. They describe the development of three new photonic ICs developed to achieve 100 Gbits/sec with a high spectral efficiency. In the first of the papers, researchers developed an integrated high-speed receiver using DQPSK modulation that is about 1,000x smaller than existing DQPSK receivers that are built out of discrete components.
Another paper demonstrated a dual-polarization modulator with a 40-Gbit/sec data stream in one polarization and a different 40-Gbit/sec data stream in another. This technique doubles the capacity of a link without requiring any additional bandwidth, said the researchers.
The last paper presents a modulator producing a 16-QAM signal format, used for systems with extremely high spectral efficiency. While this format is well known in wireless and satellite communications, its use in optics is new.