Wavelength-division multiplexing (WDM) is currently seizing as the leading technology in point-to-point transmission links. One key device is a tunable optical filter. Important features of such a filter include low insertion loss, narrow bandwidth, high sidelobe suppression, large dynamic range, fast tuning speed, an easy control mechanism, small size, and price effectiveness. Filter WDM module will depend on Thin Film Filter (TFF) technology. The FWDM is extensively used in EDFA, Raman amplifiers, WDM networks and fiber optics instrumentation. These devices combines or separates light at different wavelengths within a wide wavelength range. Since FWDM series offer suprisingly low insertion loss, low polarization dependence, high isolation and ideal environmental stability, great for very fast WDM network systems. It's popular in optical fiber systems:1310/1550nm, 1480/1550nm, 510/1550nm, 980/1550nm and 1310/1490/1550nm.

FWDM Main Features:

Wide Operating Wavelength Range;

Low Insertion Loss;

Ultra Flat Wide Passband;

High Channel Isolation;

High Stability and reliability;

Epoxy-free on Optical Path.

FWDM Applications:

Testing Instruments;

FTTH Tri-Play System.

WDM is a method of combining multiple signals on lasers at various infared (IR) wavelengths for transmission along fiber optic media. Each laser is modulated by an unbiased group of signals. Wavelength-sensitive filters, the IR analog of visible-light color filters, are utilized in the receiving end.

WDM is similar to frequency-division multiplexing (FDM). But rather than occurring at radio frequencies (RF), WDM is performed in the IR portion of the electromagnetic (EM) spectrum. Each IR channel carries several RF signals combined by means of FDM or time-division multiplexing (TDM). Each multiplexed IR channel is separated, or demultiplexed, in the original signals on the destination.

Using WDM can multiply the effective bandwidth of your fiber optic communications system by the large factor. However its cost has to be weighed against the contrary of using multiple fibers bundled in to a cable. A fiber optic repeater device known as the erbium amplifier intentions to make WDM a cost-effective long-term strategy to the bandwidth exhaustion problem.

Ingellen gives a wide range of WDM/CWDM/DWDM devices, such as CWDM Mux/Demux, CWDM OADM, DWDM Mux/Demux, DWDM OADM, Filter WDM and so on. Ingellen 1310/1490/1550 WDM devices depending on thin-film filter technology are design to address the actual requirements from the FTTP market. Strong coating and passive device packaging capabilities feature these WDMs with excellent optical performance, good reliability and ultra-compact size. Ingellen'Fliter WDM utilizes thin film coating technology and proprietary kind of non-flux metal bonding micro optics packaging.