PM (Polarization Maintaining) filter DWDM (Dense Wavelength Division Multiplexing) is an ideal WDM solution for fiber optic amplifiers, DWDM networks, EDFA, and fiber optic instrumentation applications. It combines or separates light at different wavelengths in a wide wavelength range and provides polarization maintenance, low insertion loss, high return loss, extinction ratio, environmental stability, and reliability. This article covers an introduction to PM filter DWDM.
What is a PM Filter DWDM?
PM filter DWDM is a passive micro-optic device that uses environmentally stable TFF (Thin-Film Filter) technology to achieve a wide pass band, low insertion loss, high channel isolation, high extinction ratio, polarization maintenance, and Panda PM fiber on all input and output fibers. It provides a single-channel add/drop function or is cascaded into a sequence for multi-channel applications in DWDM network systems. In addition, it is available without or with connectors (FC/APC, FC/UPC, SC/UPC, SC/APC, LC/SC/FC/ST), the connector key is aligned to the slow axis, channel spacing of 50, 100, and 200GHz, and the operating wavelength of 1529.55~1561.42 nm.
What is the Function of PM Filter DWDM?
PM filter DWDM maintains optical signal polarization while providing wavelength division multiplexing. It employs TFF technology and is compliant with Telcordial and ITU standards. In addition, it is used individually to perform single channel add/drop multiplexer in DWDM network systems and fiber optic sensor systems. PM filter DWDM combines or separates light at different wavelengths in a wide wavelength range. It can expand the capacity of a single fiber to achieve bidirectional communication so that widely used in optical network upgrades and expansion. Thus, the PM filter DWDM is suited for long-haul transmission, where wavelengths are tightly together. It is a three-port device. One port is called the common. The other two ports provide the conduit for the two wavelength bands ( reflect and pass).
Features and Benefits
PM filter DWDM provides the following features and benefits:
1. Low insertion loss, polarization-dependent loss, and cost
2. High channel isolation and power handling capability
3. High extinction ratio and return loss
4. High reliability and stability
5. Wide pass band and compact size
6. Polarization maintenance and epoxy-free on the optical path
Applications
PM filter DWDM is used in fiber lasers, fiber optic sensing, fiber optic amplifiers, fiber optic instruments, add / drop channels, WDM/DWDM network systems, EDFA, CATV, OTDR, MAN, FTTx networks, PON systems, broadband networks, wavelength routing, etc.
Conclusion
PM filter DWDM provides a wide pass band, low insertion loss, high channel isolation, and stability and can be applied to add/drop channels, DWDM networks, and EDFA to meet the diverse needs of scenarios.
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