23 September 2003 Rimini, Italy Lightwave Europe -- At ECOC 2003, Siemens ICN's approach to polarisation demultiplexing after optical-to-electrical conversion - using a device called an analog integrated-circuit based polarisation state controller - will be explained this week at ECOC 2003.
The control device can be used for endless unwinding polarisation state control and demultiplexing of polarisation multiplexed optical signals resulting in cheaper and faster transmission.
The company says that polarisation multiplexing allows for a doubling of the spectral efficiency of most modulation formats, because it employs the two available orthogonal polarisation states at the same wavelength as independent communication channels. This multiplexing technique is often used to obtain the highest transmission capacities in hero experiments.
During propagation of the two polarisation signals through the optical transmission fibre, the polarisation state changes due to the fibre birefringence. Hence at the end-of-line in order to optimally demultiplex the two polarisation channels, a polarisation state controller is required.
State of the art systems use an optical polarisation state controller for the inverse Jones matrix operation because of its simplicity and because electro-optic devices exist allowing for fast automatic control.
However it is known from radio communication that polarisation demultiplexing can be performed at the detector using a phase diversity coherent receiver. The polarisation demultiplexer presented at ECOC is based on a similar technology with an electrical analog integrated-circuit based polarisation state controller for ultrafast polarisation control.
The presentation will be held on September 25th 2003, at the Rimini exhibition 11.15am in room 2.
Siemens ICN's portfolio - HiPath for enterprises; SURPASS for carriers - comprises IP-based convergence solutions for voice and data, a range of solutions for broadband access, and optical transport networks.
The company provides solutions from a single source for the infrastructure of the Next Generation Network - optimised for a prompt return on investment and to open up new business opportunities for customers. In 2002 (year-end 30 September) IC Networks posted sales of EUR 9.6 billion.