Brief Introduction to DWDM Red/Blue Band Filter

What’s DWDM Red/Blue Band Filter?

In recent years, filter-based, Wavelength Division Multiplexing (WDM) related products have become a popular method of increasing bandwidth throughout optical networks. As an important component of DWDM system, DWDM red/blue band filter is the result of years of telecommunications experience in interference filter technology. Like other DWDM filters, the Red/Blue band filter is also based on environmentally stable thin film filters technology. There are a variety benefits of this micro-optics device. DWDM red/blue band filter is characterized with wide passband, low insertion loss, high return loss, excellent environmental stability and high power handling capability.

How Does DWDM Red/Blue Band Filter Work?

A typical DWDM red/blue band filter is a three-port device. One port is called the “common” while the other two ports respectively called “pass” and “reflect” that provide the conduit for the two wavelength “bands”. These two bands are called Blue band (λ<1543 nm) and the Red band (λ>1547 nm). Reflected port and the pass port must be designated either Red or Blue, and then one band goes through the reflected port, and the other band goes through the pass port. In general, the band, which requires the highest isolation, goes on the pass port. It can be used as a band combiner or a band splitter. When it is a combiner, the bands are combined in the filter and sent to the common port. Conversely, if it is as a splitter, the both bands are fed from the common port and split to the corresponding port (pass port or reflect port). Thus, it is typically used as a bidirectional WDM (ie. One band is sent to the common port, while the other band is delivered from the common port).

Where Should I Use DWDM Red/Blue Band Filter?

According to its working principle, red/blue band filter can be used in several ways, such as red and blue band separators, application of DWDM system monitoring and erbium doped fiber amplifiers etc. In addition, when using a Red/Blue filter in a DWDM module, a Mux may be combined with a Demux. For example, the Mux combines DWDM channels in the Red band, while the Demux separates DWDM channels in the Blue Band. In other word, using a Red/Blue filter, one can combine the Red Transmit channels and the Blue Receive channels onto a single fiber.

DWDM Red/Blue Band Filter in Fiber-Mart

Fiber-Mart recently launches 1×2 DWDM Red/Blue Band Filter in three package types: Typical, Plastic ABS Box Package and 1RU 19″ Rack Mount Package. In addition, to better meet your special control and application, Fiber-Mart supplies custom channel and custom band filters, all units are available as steel tubes, modules, rack mounts or custom mount designs with a more competitive price. Welcome any product consultations if you are interested in our products.

Warm Tips: You can know more details of our new excellent DWDM Red/Blue Band Filters on line or contact us directly over E-mail [email protected].