Which Is Better for 80km Links? PAM4 or Coherent Technology

A significant portion of Data Center Interconnections (DCIs) and telecom router-to-router interconnections rely on simple ZR or 80km transceivers. The former is mostly based on 100Gbps per 100GHz ITU-T window C-band DWDM transceivers, while the latter is mostly 10G or 100G grey wavelength transceivers. In DWDM links, the laser wavelength is fixed to a specified grid, so that with DWDM…

fiber optics

An Analysis on Principles and Key Techs of 40G/100G Coherent Optical Communication

As the large-scale deployment of 40Gb/s is carried out, many new 100G/s code modulation formats have emerged in the industry. For various transmission code patterns with different features, based on the comprehensive consideration on parameters of other system design, comprehensive selections are made from perspectives of transmission distance, channel spacing, compatibility with 40Gb/s and 10Gb/s systems, costs of the optical…