WDM devices (CWDM, DWDM, etc.) are proven and viable solutions for meeting the growing capacity needs in future FTTX applications, including mobile backhaul.
CWDM Mux/Demux: Fiber Optical Multiplexer
FTTH networks are typically considered fiber-rich and the passive optical components involved are 1×16, 1×32 or even 1×64 splitters that split the signal to multiple users. However, when it comes to businesses, campus environments or MDUs, multi-service operators are typically limited to one or two fibers. It is in these applications that wavelength division multiplexing technologies, such as Coarse WDM (CWDM) and Dense WDM (DWDM) can be used to increase the bandwidth capabilities and deliver multiple services to multiple end users.
CWDM Mux (fiber optical multiplexer) can combine four, eight, or up to 18 wavelengths onto a fiber. The channel spacing is set to 20 nm in a wavelength range that spans the window from about 1250 to 1650 nm — a window that could include 20 channels. The coarse spacing allows for very reduced temperature and wavelength stability requirements on the components, and requires filters with large, almost 20-nm bandwidths.
CWDM Mux: Optical Wavelength Multiplexer
A wavelength multiplexer (CWDM MUX) (or optical multiplexer (OM)) is a branching device with two or more input ports and one output port, where the light in each input port is restricted to a preselected wavelength range and the output is the combination of the light from the input ports.
A wavelength demultiplexer (CWDM DMUX) (or optical demultiplexer (OD)) is a device which performs the inverse operation of a wavelength multiplexer, where the input is an optical signal comprising two or more wavelength ranges and the output of each port is a different preselected wavelength range.
Both wavelength multiplexers (CWDM MUX) and wavelength demultiplexers (CWDM DEMUX) are generally called “WDM Devices” since often the same device can be used to multiplex and demultiplex channels.
An optical add/drop multiplexer (CWDM OADM) subsystem is a wavelength selective branching device (used in WDM transmission systems) having a wavelength “drop” function in which one or more optical signals can be transferred from an input port to either an output port or drop port(s) depending on the wavelength of the signal. An CWDM OADM also has a wavelength “add” function in which optical signals presented to the add port(s) are also transferred to the output port.
CWDM Mux/Demux Modules and Devices
FEATURES OF CWDM MUX/DEMUX MODULES AND DEVICES
- Modularized Design
- CWDM Mux/Demux/OADM
- ITU CWDM Grid
- Low Loss & Highly Reliable
APPLICATIONS OF FIBER OPTICAL MULTIPLEXER
- Optical Add/Drosp Multiplexing
- Telecom Networks
- Metro Networks
|Specifications of CWDM Mux / Demux / OADM Modules & Devices|
|Parameter||Unit||4 Channel||8 Channel||16 Channel||18 Channel|
|Central Wavelength||nm||ITU CWDM Grid: 1271 to 1611; (OR) 1270 to 1610|
|Channel Passband||nm||±6.5 / ±7.5|
|Adjacent Channel Isolation||dB||≥30 (Demux); N/A (Mux)|
|Non-Adjacent Channel Isolation||dB||≥40 (Demux); N/A (Mux)|
|Polarization Dependent Loss||dB||≤0.1|
|Polarization Mode Dispersion||ps||≤0.1|
|Wavelength Thermal Stability||nm/°C||≤0.002|
|Insertion Loss Thermal Stability||dB/°C||≤0.005|
|Power Handling||mW||300; (OR) 500|
|Fiber Type||/||SMF-28e compatible fiber|
|Operating Temperature||°C||-5 to +70; (OR) -40 to +85|
|Storage Temperature||°C||-40 to +85|
|Box||mm||100x80x10; 120x80x18; 140x115x18; (OR) Custom|
|LGX||mm||1U: 29x155.5x129; 2U: 58x155.5x129|
|19” Rackmount||mm||1U: 483x250x43.6|
|Ordering Information of CWDM Mux / Demux / OADM Modules & Devices|
|CWDM Mux / Demux / OADM Modules & Devices||Channel Number||Type||Package||Operating Temperature||Wavelength||Pigtail Type||Fiber Length||Connector|
|4CH||Mux||Box||-5 to +70 °C||1271 / 1270||900um loose tube||0.5m||None|
|8CH||Demux||LGX||-40 to +85 °C||1291 / 1290||2mm cable||1.0m||LC/PC|
|16CH||OADM||Rackmount||…||3mm cable||Custom …||LC/APC|
|18CH||1611 / 1610||SC/PC|