Coherent detection technology

The coherent detection technology uses a local oscillator (LO) laser that has the same frequency as the received signal and implements interference between the LO laser signal and the received signal to restore the amplitude, phase, and polarization status information from the received signal. In addition, the technology uses high-speed analog-to-digital converter (ADC) and digital signal processing (DSP) techniques to compensate for CD and PMD on the line.
The coherent detection technology improves the CD, PMD, and OSNR tolerance, and system transmission capability, achieving transmission performance equivalent to a 10G network.
By using the coherent detection technology, a 40G/100G coherent system does not have to use a fixed dispersion compensation module (DCM) or a tunable DCM (TDCM), which is intended for fine tune the dispersion of a single wavelength in a traditional 40G system. A 40G/100G coherent system requires fewer optical amplifiers, does not require accurate measurement of the fiber length and dispersion, reduces system configuration costs and labor, and improves fiber transmission network performance.

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