WDM (Wavelength Division Multiplexing) is a transmission technology that uses a single optical fiber to simultaneously transmit multiple optical carriers of different wavelengths in optical fiber communications. When the wavelength of light is different, the transmission loss in the fiber is also different. In order to reduce the fiber loss, it’s important to find the most suitable transmission wavelength. After a long period of exploration and testing, light with a wavelength in windows within 1260nm~1625nm have the smallest dispersion signal distortion with low loss, which is the most suitable for transmission in optical fiber.
What is C band?
The C-band (Conventional Band) ranges from 1530 nm to 1565nm and represents the conventional band. Optical fiber shows the lowest loss in the C-band and occupies a large advantage in long-distance transmission systems. It is usually used in many metropolitan areas combined with WDM, long-distance, ultra-long-distance and submarine optical transmission systems with EDFA technology.
Basic C-Band
C-Band ( Basic ) 80-wavelength (considering the spacing is 100 GHz) systems consist of even and odd wavelengths.
C_EVEN: indicates even-numbered wavelengths. In total there are 40 even wavelengths within the range of 192.100 THz to 196.000 THz (1529.55 nm to 1560.61 nm) and the frequency spacing is 100 GHz.
C_ODD: indicates odd-numbered wavelengths. In total there are 40 odd wavelengths. within the range of 192.150 THz to 196.050 THz (1529.16 nm to 1560.20 nm) (considering the spacing is 100 GHz).
Extended C-band
Extended C-band 96-wavelength (considering the spacing is 100 GHz), systems consist of even and odd wavelengths.
Extended C_EVEN: indicates even-numbered wavelengths. In total there are 48 even wavelengths within the range of 191.300 THz to 196.000 THz (1529.55 nm to 1567.13 nm) . (considering the spacing is 100 GHz)
Extended C_ODD: indicates odd-numbered wavelengths. In total there are 48 odd wavelengths within the range of 191.350 THz to 196.050 THz (1529.16 nm to 1566.72 nm) (considering the spacing is 100 GHz)
Super C-band
Super C-band 120-wavelength (considering the spacing is 100 GHz) systems consist of even and odd wavelengths.
Super C_EVEN: indicates even-numbered wavelengths. In total there are 60 even wavelengths within the range of 190.750 THz to 196.650 THz (1524.50 nm to 1571.65 nm) (considering the spacing is 100 GHz).
Super C_ODD: indicates odd-numbered wavelengths. In total there are 60 odd wavelengths within the range of 190.700 THz to 196.600 THz (1524.89 nm to 1572.06 nm) (considering the spacing is 100 GHz).
When planning a new project , you must consider the system capacity , the operators of the backbone and submarine projects prefer the Super-C for their networks but they should Acquire the boards that support this capacity .
Huawei equipment satisfy all customers needs ,so you can find the capacity you plan to .
For example to the Super C boards in OSN9800 M24 choose The OTN board like U6N402 and for MUX/DEMUX Boards G2M60 as Mux board , G2D60 as Demux and choose Amplifiers like G2DAP .
Conclusion
utilizing available resources to get the maximum advantage of the best DWDM bands is a key factor to expand the capacity .
keep using C-band saves cost by using same boards for example using EDFA boards supporting
C-band instead of using boards for C band and L band .
Huawei products satisfy all needs for different customers capacity .
Comments are closed