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T&S TFF WDM is based on Thin Film Filter (TFF) technology. Our Filter-Based WDM product family covers following wavelength windows commonly used in optical fibre systems: 1310/1490/1550nm (for FWDM Device), 1271~1611nm (for CWDM Device or Module), 1525~1565nm (C_band for 100G/200G DWDM Device or Module) and 1269.23~1318.35nm (for 800G LWDM Device or Module),  1271±3.5~1371±3.5nm (for  MWDM Device or Module) and 1270/1310/1490/1534/1577/1610/1650nm (for  Cex-wdm Modules, including GPON, XG-PON, NG-PON2 and OTDR )

TS's WDM products based on TFF technology have good wavelength and temperature stability, which can meet the requirements of ordinary commercial-grade environments and the industrial-grade environmental requirements of 5G fronthaul networks; and the wavelength, bandwidth and other parameters of TFF products are flexible. Corresponding products can be customized according to customer requirements, so that TFF-based WDM products can be widely used in various communication scenarios, such as G-PON/XG-PON/NG-PON2 scenarios for access networks, and CWDM/DWDM transmission for metropolitan area networks Scenario, from the BBU/DU of the 4G/5G fronthaul to the RRU/AAU.


What is thin film filter (TFF) WDM? Dielectric thin film WDM is composed of thin film filter (TFF).

TFF is composed of dozens to hundreds of dielectric films of different materials, refractive index and thickness. One layer is of high refractive index and the other is of low refractive index, so it is a passband for a certain wavelength range and a stopband for another wavelength range, forming the required filtering characteristics.

What is WDM technology?

WDM (wavelength division multiplexing, WDM) technology is to transmit multiple wavelength optical carrier signals at the same time, and each optical carrier operates in FDM or TDM mode, and each carrier has multiple analog or digital signals. The basic principle is to combine (multiplex) the optical carrier signals of different wavelengths on the transmission side, and couple them to the same optical fiber for transmission on the line. When arriving at the receiving end, the optical carrier signals of different wavelengths will be separated (demultiplexed), so that the number of optical fibers laid in the main transmission link will be doubled. Therefore, this technology is called optical wavelength division multiplexing, which is called optical wavelength division multiplexing Reuse technology.

What are the types of technologies that can realize WDM products in the industry?

At present, there are three main technologies to realize WDM products: fiber fused taper (FBT), thin-film filter (TFF) and arrayed waveguide grating (AWG). Among them, TFF and AWG are the two most commonly used WDM technologies.

What is the classification of WDM according to the channel spacing?

According to the channel spacing, WDM can be subdivided into CWDM (sparse wavelength division multiplexing) and DWDM (dense wavelength division multiplexing). The channel spacing of CWDM is 20nm, while that of DWDM is from 0.4nm to 1.2nm. Therefore, compared with DWDM, CWDM is called sparse WDM technology.

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Applications of TFF Type WDM

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