As the demand for high-speed network data continues to grow, operators need to continuously upgrade their networks to support higher transmission capabilities. There are usually two ways to expand the optical fiber information capacity: rate upgrades such as 10G to 40G, 100G, 400G, 800G, and the use of wavelength division multiplexing transmission systems and constantly alternating frequency intervals.
Some facilities and components in the optical fiber transmission network, such as the embedded optical fiber of the backbone network and the relay base station and other resources, are difficult to upgrade in a short time, and the cost of new construction and upgrade is very high. The transmission capacity of the optical network is continuously expanded. In this process, the equipment and components of the computer room and the relay station are continuously upgraded and increased. Therefore, the reduction and compact size of the equipment have resulted in the factors that must be taken into account in the optical fiber equipment and components.
Wavelength division multiplexing systems are usually divided into coarse wavelength division multiplexing (CWDM) and dense wavelength division replacement (DWDM). Filter WDM is based on thin film filter (TFF), with mature technology, stable product performance, working temperature can reach -40~+85℃ and a wider temperature range, each wavelength is an independent device, when some wavelength is used, multiple devices of different wavelengths are cascaded.
The arrayed waveguide grating WDM is based on the linear coupling of light of different wavelengths. The light propagates in multiple optical paths. Due to the different optical path lengths, the phase shifts generated in each optical path are also different, and the light in different optical paths interferes. , there is only one specific wavelength of light in each exit channel. Due to the nature of the material, the working temperature of the grating grating wavelength division multiplexer usually can only reach 0~+70℃. , When multiple wavelengths are used at the same time, the cost of subdividing wavelengths is greatly reduced by the modulation method of wavelength division multiplexer. Therefore, the use of grating grating wavelength division multiplexers is increasing.
The general size of the arrayed waveguide grating WDM module is 120 * 70 * 10mm, but in some applications, such as optical sub-boxes, optical fiber connection boxes and other small-sized spaces, it is difficult to install. Corephy Optics Co.,Ltd has developed and designed mini-size DWDM AWG modules for similar applications, with a size of only 65x45x10mm. It can provide 100Ghz DWDM 1x16, 1x32, 1x40, 1x48 and other different types and wavelengths. The product is stable, low insertion loss, Gaussian type and flat top type are available.