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100G/200G Coherent Optics Solution for Metro & Core Network

The larger bandwidth, longer transmission distance and higher receiving sensitivity will always be the final goals of researchers in the field of optical communication. With the explosive growth of information generated by the application of communication technologies such as video conference and the spread of the Internet, higher transmission performance requirements have been proposed for the physical layer that is the basis of the entire communication system. Driven by strong demand, large-scale DWDM are gradually depleting their wavelength resources, and the efficiency of Time-pision Multiplexing (TDM) systems through compressed optical pulses also has a large technical bottleneck. As a result, the coherent system that seems to have been forgotten has once again caught people's attention.

The theory and experiments of coherent optical communication began in the 1980s. Coherent optical communication systems are recognized as having high sensitivity, researchers have done a lot of research on it. Due to the development of EDFA and WDM technology, the research of coherent optical communication was once burgeoned slowly. However, as the time flows, many following problems make this theory be concerned widely again. In terms of digital communications, how to expand the capacity of C-band amplifiers, overcome the deterioration of fiber dispersion effects, and increase the capacity and range of free-space transmission have become important considerations for researchers;On the other hand, in terms of analog communication, sensitivity and dynamic range are key parameters of the system. These can all be improved by coherent optical communication technology.

Gigalight determines to make progress under the new historical opportunity. Our engineers developed the Single Lambda CFP-DCO 100G coherent optical module, using DP-D/QPSK modulation technology to make it adjustable in the full C-band ITU-T (50/100GHz), standard 100GE interface (OTU4 customized) compliant with CFP MSA protocol, which is convenient for users to directly access existing equipment; for Data Center Interconnection (DCI) and customized metropolitan area network application , meeting the condition of transmission distance (up to 100Km), supporting P2P and DWDM transmission. More important, using Silicon-light technology integrated optimization solution to meet the needs of low-power applications (up to 22W) for qualified performance, which can also provide customized system solutions according to the application scenario.

The 100G coherent optical module belongs to the technical research field of long-distance transmission of 100G DWDM. It is mainly used for line-side optical transmission of 100G WDM system. Compared with other various forms of line-side optical modules, it has better OSNR performance, sensitivity, dispersion limit, and DGD tolerance, which make it become a common choice in the industry. The key technologies include DP-QPSK modulation technology, coherent detection technology and DSP processing technology.

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