Brief Introduction to DWDM Red/Blue Band Filter
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Brief Introduction to DWDM Red/Blue Band Filter

Posted on by FS.COM

Recently, Fiberstore has launched an excellent new product named DWDM Red/Blue Band Filter. Questions, such as “What is red/blue band filter?” or “How does it work?” or “Where should I use?” etc. may be the focus of interest of many users. Based on these questions, we will make a brief introduction to the DWDM Red/Blue Band Filter in today’s blog.

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?
applicationA 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 Fiberstore
Fiberstore 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, Fiberstore 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.


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