WDM Filter and Wavelength Division Multiplexer
WDM systems enable multiple services to be transported simultaneously over one optical fiber by combining and separating light signals at different wavelengths. They help to optimize the use of optical fibers and reduce the need for laying more cables.
Compared with CWDM, DWDM uses tighter wavelength spacing and can support 8 to 160 wavelengths on one optic fiber, making it very suitable for long-haul transmission. It is widely used in the convergence and access layers of metropolitan area networks.
1. Wide Pass Band
A wide band pass filter is a type of electronic circuit that isolates a wide spectral band. For example, in audio, a wideband filter can be used to boost the mid-range of an instrument’s tone without removing its sparkling highs or full-bodied lows. This is because a wideband filter has a flatter frequency response curve than a narrowband filter.
Wavelength division multiplexing, or WDM, allows different data streams at different frequencies to be sent simultaneously over a single optical fiber network. This increases bandwidth and saves networking costs by eliminating the need for separate cables for each service. The key components of a WDM system are the transceiver and the multiplexer. The transceiver transmits the high-speed data protocols, while the multiplexer combines and multiplexes them into one signal. The signals are then transported on a patch cord, which connects the output of the multiplexer to the input of the transceiver.
FWDM is based on environmentally stable thin film fwdm-filter-wavelength-division-multiplexer filters technology, which can combine or separate light at different wavelength in a wide range. It can be widely used in PON and CATV to expand the capacity of a single fiber, or introduce new comprehensive business etc.
2. Low Insertion Loss
Wavelength division multiplexing, WDM for short, allows different data streams at different frequencies to be combined onto a single optical fiber and transmitted. This allows for increased capacity without the cost of laying more fiber. There are two main types of WDM systems: Coarse Wavelength Division Multiplexing, CWDM and Dense Wavelength Division Multiplexing, or DWDM.
CWDM tightly packs channels in the 1525 to 1565 nm wavelength range, typically with channel spacings of 0.8 nm or less. CWDM is a simple technology with moderate capacity needs and can be implemented at lower cost than DWDM systems.
The FWDM series is built with environmentally stable thin film filters. It offers low insertion loss, low polarization dependence, high isolation and excellent environmental stability. This makes it an ideal choice for FTTx and PON constructions. It is widely used in EDFA, Raman amplifier and WDM optical networks. It can be used to combine C band and L band or separate them, with a wide operating wavelength range for expansion of optical networks. It is also suitable for high-speed data transmission and video communication applications.
3. High Isolation
The FWDM filter has high isolation to separate the transmitted and received signals, which is essential for signal quality and reliability. Isolation is also important to minimize crosstalk, which is the unwanted interference between two channels due to their spectral overlap.
Optical FWDM systems use multiplexers at the transmitter end to combine several optical signals in one fiber and demultiplexers at the receiver end to separate them. This allows the transmission of multiple wavelengths on a single fiber, increasing capacity and reducing network cost.
SENKO’s Filter WDM series is based on environmentally stable Thin Film Filter technology. It combines or separates light at different wavelengths in wide wavelength range, especially it works on 1310nm/1550nm bands, which is widely used for CATV system. It offers very low insertion loss, low polarization dependence, high isolation and excellent environmental stability. It can be built as a module, rack mount or pigtailed. It is suitable for EDFA, Raman amplifiers, FTTH and WDM optical networks. Moreover, it can work in various temperature environments. All products have CE and RoHS certifications.
4. Low Power Consumption
FWDM uses bandpass filters to assign non-overlapping wavelength bands to each data channel, preventing interference between signals. This ensures that a single data signal will be transmitted over the entire bandwidth, while reducing crosstalk (the undesired mixing of signals caused by their spectral overlap).
Optical FWDM devices are designed to be power efficient. They have low insertion loss and high isolation, which helps to minimize power consumption. Moreover, they are designed to operate within a wide temperature range, making them suitable for use in most environments.
FWDM is used to combine or separate light at different wavelengths (1310nm/1490nm/1550nm) in a single optical fiber to expand the capacity of the fiber and achieve bidirectional communication. It is mainly used for fiber network upgrade and expansion or introduction of new integrated services. It also can be used for CWDM and Dense Wavelength Division Multiplexing (DWDM) applications. Optical DWDM uses multiplexers at the transmitter and lgx-plc-splitters demultiplexers at the receiver to combine several wavelengths together into one optical signal, which is then transmitted over a single fiber. It can be used for SONET/SDH, PON, CATV and FTTx systems.
5. Small Size
Filter-based WDM is based on environmentally stable thin-film filter technology and can combine or separate light at different wavelengths in a wide range of wavelength windows. It can expand the capacity of a single optical fiber to achieve bidirectional communication. It is extensively used in EDFA fiber amplifiers, WDM networks and fiber optics instrumentation. They offer low insertion loss, low polarization dependence, high channel isolation and excellent environmental stability.
Compared to CWDM, it can support 8 to 160 wavelengths on an optical fiber, and the dense wavelength spacing makes it more suitable for long-distance transmission. It can significantly reduce the cost of network construction and operation.
SENKO’s FWDM is available in both 3 ports and 6 ports, and can be used to combine 1310 and 1550 signals, such as PON signal and CATV signal, into one single fiber. It can pass one wavelength and reflect the other two, which can save fiber resources, improve network performance and conduct business smoothly. It is a good choice for upgrading and expanding existing optical fiber systems. Note: Values listed above are without connector, and additional 0.2dB loss can be added by connector.