10 Gbit/sec Digital Equalization Chip (DECS)
Description
CoreOptics DECS™ (Digital Equalizer Chip Set) is based
on a digital equalization technique called Maximum Likelihood
Sequence Estimation (MLSE). Like some analog techniques, MLSE
relies on measurement of the (distorted) incoming pulse amplitude
to effect a correction. However, rather than applying an analog "inverse" transfer
function to "un-distort" the signal, MLSE calculates
the probabilities of decision sequences within a time period.
The probability assigned to a particular decision sequence
is based on the sampled pulse amplitude and knowledge of the
most probable transfer function (and hence distortion) of surrounding
received data. The bit sequence with the highest likelihood
of resulting in the measured output is chosen for the output
stream.
The DECS™ technology applies best to the case of deterministic
signal distortions, which is exactly what results from fiber
non-linearities and imperfect optical and/or electrical components.
Using this capability DECS™ can lead to the use of
lower cost components by allowing the relaxation of component
specifications.
The digital application of MLSE distinguishes the Core Optics
DECS™ solution, and provides a superior performance
to competitive analog feed-forward or decision feedback implementations
of equalization. DECS™ significantly improves the effects
of system degradation due to signal distortions.
Applications
* DWDM transmission equipment
* Metro, Metro-Core, Regional and Long Haul applications |
10 Gbit/sec
Digital Equalization Chip (DECS)