Electroless relay transmission distance exceeds 5,000 km, system capability reaches 160*10G/s

Recently, ZTE launched its proprietary high-capability ULH DWDM system. The system capability reaches 160*10G/s, the wavelength covers C+L wave bands, and electroless relay transmission distance of more than 5000 km can be achieved over G.652 and G.655 optical fibers. To date, this is the longest distance in Ultra Long Haul transmission ever realized in China.

ZTE’s ULH DWDM system adopts a series of advanced technologies, including distributed Raman amplifier and EDFA mixed amplifying technology, OTU, NRZ and RZ modulation codes with Forward Error Correction (FEC), dynamic power equalization, and distributed dispersion management technology. The gain of distributed Raman amplifiers can reach 12 dB, featuring broadband (the bandwidth of gain can be more than 80nm) and gain sharing. Distributed Raman amplifiers can automatically adjust gain based on the distribution of signals, so it can be reliably applied in the system. The system supports OC-192/STM-64, with wavelength channel space of 50GHz and a maximum capability of 1.6Tb/s. The system has a modularized scalability feature, and can be easily upgraded from 40 or 80 wavelengths to 160 wavelengths, with no errors in any wavelength. 

ULH represents an electroless relay transmission distance of more than 2,000 km, which is applicable to the construction of long-haul backbone networks and large-span transmission links. In constructing the long-haul backbone network, ULH can reduce the number, power-consumption and equipment room area of relay stations. With the advantages of low initial investment and low cost of long-term operation, ULH can combine with OADM into point-to-point transmission links and DWDM ring networks; and can be further coupled with switching nodes into grid networks. ULH transmission technology can also extend the single-span transmission distance, realizing the large span transmission.   

ZTE is committed to the close integration of new technologies with commercial applications. At an ITU-T SG15 (optical and other transport network) plenary meeting in October 2003, ZTE was granted the right to draft new G.raman standards for G.raman amplifiers, making the core technology - the distributed Raman amplifier employed in the ULH system - a new international standard. This is the first international standard written by a Chinese enterprise in the optical communication area.