DP-QPSK is one of the mainstream modulation technologies of metropolitan area network and core network. Compared with the traditional direct detection system, coherent detection can obtain more signal information through the beat frequency of the signal light and the local-oscillator(LO). In addition, with high-speed digital signal processing, coherent optical communication can place signal reconstruction and distortion compensation at the system receiver side. The combination of coherent detection and DSP technology eliminates the obstacles of traditional coherent reception, and can also compensate various transmission impairments in the electrical domain, simplify the transmission link, and reduce the transmission cost; making high-order modulation format and polarization state multiplexing possible, reaching the results that the total capacity and transmission distance of the communication system will be further improved based on the original multiplex/wavelength division multiplexing system.
At the same time, the application of high-order modulation formats enables coherent optical communication to have higher single-wavelength channel spectrum utilization compared to conventional systems. Coherent receivers have no special requirements for fiber channel, so coherent optical communication can use already laid fiber lines. With the aid of digital signal processing algorithms, coherent receivers can compensate for signal distortion caused by fiber dispersion, polarization mode dispersion, and carrier phase noise at a very small cost.
In short, the coherent optical communication system is a more advanced and complex optical transmission system, which is suitable for longer-distance, larger-capacity information transmission, and the technical requirements are naturally very demanding. the coherent optical module based on DSP processing technology often encounters the problem of large power consumption. HTF coherent optical communication module suitable for 200G or even 400G optical transmission networks, in preparation for the construction of a new generation of optical communication networks.
If need upgrade the the fiber network, HTF will help you to design the single lambda support 400G/200G/100G DWDM. support@htfuture.com 008618123672396
