FB-LINK 16CH CWDM Mux Demux 1270-1570nm Dual Fiber Module

The sixteen wavelengths this module carries on the ITU-T G.694.2 grid

 

 

Optical parameters. The 16 Channel column applies to this module; the other columns are shown so you can size a mixed project from one table.

 

Parameter	4 Channel	8 Channel	16 Channel	18 Channel
Center wavelength (nm)	1270~1610 / 1271~1611
Center wavelength accuracy (nm)	±0.5
Channel spacing (nm)	20
Channel passband (@-0.5dB bandwidth) (nm)	±7.5 / ±6.5
Insertion loss (dB)	≤1.5	≤2.5	≤3.5	≤3.5
Channel uniformity (dB)	≤0.6	≤1.0	≤1.5	≤1.5
Isolation, adjacent (dB)	>30
Isolation, non-adjacent (dB)	>40
Isolation, express with filter (dB)	>30
Isolation, express without filter (dB)	>12
Channel ripple (dB)	<0.3
Insertion loss temperature sensitivity (dB/°C)	<0.005
Wavelength temperature shifting (nm/°C)	<0.002
Polarization dependent loss (dB)	<0.1
Polarization mode dispersion (ps)	<0.1
Directivity (dB)	>50
Return loss (dB)	>45
Maximum power handling (mW)	300
Operating temperature (°C)	-40 ~ +85
Storage temperature (°C)	-40 ~ +85
Package dimension, glass tube (mm)	5.5 × 25
Package dimension, steel tube (mm)	5.5 × 34
Package dimension, ABS box (mm)	L100×W80×H10 · L120×W80×H18 · L141×W115×H18
Configuration	Dual fiber duplex, matched Mux and Demux pair
Connector	LC/UPC as listed. FC/APC, FC/PC, SC/APC, SC/PC, LC and ST selectable in the ordering code below.

 

Ordering code HC-CWDM-A-B-C-D-E-F

 

A, channels	B, 1st channel	C, configuration	D, fiber type	E, fiber length	F, connector
04: 4 Channel 08: 8 Channel 16: 16 Channel 18: 18 Channel N: N Channel	27: 1270nm …… 47: 1470nm 49: 1490nm …… 61: 1610nm	M: Mux D: Demux O: OADM	1: Bare fiber 2: 900µm loose tube 3: 2mm cable 4: 3mm cable	1: 1m 2: 2m S: Specify	0: None 1: FC/APC 2: FC/PC 3: SC/APC 4: SC/PC 5: ST 6: LC S: Specify

 

Send us the code, or just tell us the plan in plain words and our engineers will write the code for you.

 

 

A thin film filter stack inside the box splits the 1270 to 1570nm window into sixteen 20nm slots and merges them onto a single duplex pair. Put a CWDM Mux Demux at each end and a route that used to carry one service now carries sixteen, each one independent, each one transparent to whatever protocol and bit rate you run over it.

 

Nothing in that path draws power. There is no laser to age, no fan to fail and no firmware to patch, which is why this class of passive wavelength multiplexer keeps turning up in unmanned huts and manhole splice points where a truck roll is expensive.

 

Loss is held at 3.5dB or better and channel uniformity at 1.5dB or better, so the sixteenth wavelength behaves much like the first. Adjacent isolation above 30dB and non adjacent isolation above 40dB keep the channels from bleeding into each other once the plan is fully loaded.

 

 

One power budget number covers all sixteen wavelengths

 

Loss is bounded at 3.5dB per unit. A dual fiber link uses two multiplexers, so 7.0dB of module loss covers both ends before you add fiber attenuation and patch connectors. Uniformity of 1.5dB bounds the spread across all 16 channels as well.

 

What that saves you is a spreadsheet. Your engineers size transceiver reach against one worst case figure instead of derating wavelength by wavelength, and when a service gets moved to a different channel next year nobody has to redo the arithmetic.

 

16 channels keeps your optics inside mainstream part numbers

 

This plan stops at 1570nm and leaves 1590 and 1610nm on the shelf. Those two sit at the far L band edge, which is exactly where coloured optics get harder to second source and slower to restock.

 

So the CWDM Mux Demux still lands sixteen services on the pair, but every transceiver that populates them is a part number you can get quoted from more than one vendor. The two unused wavelengths stay free for an OADM drop or an expansion build later.

 

How the 16 channel plan compares with 8CH and 18CH

 

Same platform, same test standard. Pick on services needed and fiber grade, not on price per channel alone.

 

Plan	Wavelengths	Insertion loss	Uniformity	Choose it when
8 channel	Eight of the grid	≤2.5dB	≤1.0dB	Eight services is enough and you want the loosest loss budget
16 channel, 1270-1570nm	Sixteen consecutive	≤3.5dB	≤1.5dB	High density on a confirmed G.652.C/D route, mainstream optics
18 channel	All eighteen, to 1610nm	≤3.5dB	≤1.5dB	You need every wavelength the grid has and can source L band edge optics

 

Fully passive and rated from -40 to +85 degrees

 

No power feed, no cooling, 300mW handling and the same -40 to +85°C rating for operation and storage. At a tower site or a roadside cabinet a passive CWDM multiplexer means one less breaker position, one less rectifier and nothing added to the thermal calculation.

Not sure which plan fits your route? Send the route length, the fiber grade and how many services you need to land. FB-LINK will come back with a channel plan, a link budget and a factory direct price, usually the same day.

Ask FB-LINK for a channel plan

Inside the Thin Film Filter Optical Path of This CWDM Module

 

The filters inside every CWDM Mux Demux are assembled with non flux metal bonding micro optics packaging, so there is no epoxy sitting in the beam path where years of thermal cycling would otherwise cause drift.

 

Passband and thermal behaviour

• Passband of ±7.5 / ±6.5nm at -0.5dB against ±0.5nm centre wavelength accuracy, so the filter window is far wider than the drift of a standard uncooled coloured optic.
   
• Wavelength shift under 0.002nm per degree and loss shift under 0.005dB per degree.
   
• Channel ripple under 0.3dB.

Across the full 125 degree span the wavelength moves less than a quarter of a nanometre. That is why an outdoor cabinet needs no heater and no cooler for this box.

Reflection, polarisation and enclosure

• Return loss above 45dB and directivity above 50dB.
   
• Polarization dependent loss under 0.1dB and polarization mode dispersion under 0.1ps, so the box is not the limiting element for your 10G or 25G services.
   
• Pigtailed ABS box in L100×W80×H10, L120×W80×H18 and L141×W115×H18mm.

The ABS box drops into a splice tray, a wall bracket or a shelf. If your site standard calls for something else, the same optics ship in an aluminium box, an LGX cassette or a 1U 19 inch rack unit.

Where Project Ready CWDM Mux Demux Modules Get Deployed

 

Metro fiber capacity expansion

When a carrier hits a strand count ceiling on an existing metro route, sixteen services go onto one duplex pair instead of into a trench. Sixteen channel working means business Ethernet, mobile backhaul and residential aggregation share the pair without touching each other.

Data centre interconnect

Each wavelength carries its own 1G, 10G or 25G link between sites. Because the path is passive, an intermediate manhole or splice point on the DCI route needs no equipment, no power and no maintenance window.

5G fronthaul and backhaul aggregation

A hub site CWDM Mux Demux gathers traffic from a cluster of remote radio units onto one pair back to the baseband controller. As densification adds sites, the strand count between them stays where it is.

Check your fiber grade before you specify this plan

The 1390 and 1410nm channels sit in the water peak, where legacy G.652.A/B fiber shows an attenuation spike from residual OH ions. On low water peak G.652.C/D, which is the modern default, all sixteen channels run normally. If the route is mixed or you simply do not know, ask for the skip band build that leaves those two out. It costs the same and ships in the same window.

 

Custom CWDM Mux Demux OEM Manufacturing Built to Your Channel Plan

 

Everything below is set on the production line, not adapted on site. Tell us the plan and FB-LINK builds to it as your OEM manufacturer, including your own branding and labelling if this ships under your part number.

Wavelength plan

• Any subset of the grid from 2 to 18 channels, odd counts included
• Skip band layouts that avoid 1390 and 1410nm
• A 1310/1550nm expansion port so a DWDM overlay can be stacked inside one CWDM channel later

Connectors and pigtails

• LC/UPC, LC/APC, SC/UPC, SC/APC, FC/PC, FC/APC and ST
• Bare fiber, 900µm loose tube, 2mm or 3mm cable
• 1m, 2m or a length you specify

Housing and branding

• ABS box, aluminium box, LGX cassette, 1U 19 inch rack or wall mount bracket
• Optional 1% or 2% tap for non intrusive power monitoring
• Your label, your carton, your documentation on ODM programmes

 

Every CWDM Mux Demux We Ship Is Factory Tested Against Its Own Optical Report

 

Insertion loss, channel isolation, return loss and wavelength accuracy are measured on each CWDM multiplexer across the full operating temperature range, and the report travels with the box. Your incoming inspection checks a document written for that serial number rather than a generic datasheet.

 

• ISO 9001 for the manufacturing process.
• Telcordia GR-1221 as the reliability process applied to these passive modules.
• RoHS and REACH materials compliance across the line.
• 3-year warranty, with the individual test report supplied per unit.

 

Packaging and Shipping for Bulk Order CWDM Multiplexer Projects

 

Pigtails are coiled and retained inside the enclosure with the end faces protected, so the unit arrives ready to mount and nobody has to re dress fiber on site. The optical test report ships in the box with it.

 

CWDM Mux Demux consignments leave the Shenzhen factory by courier, air or sea. On staged rollouts we schedule batch delivery against your programme instead of dropping the whole order at once, and project labelling, carton marking and packing lists are prepared on request.

 

 

Order type	MOQ	Lead time	Notes
Sample, any standard configuration	No MOQ, 1 unit	3-5 business days	Buffer stock held on popular plans
Standard 4 / 8 / 10 / 16 / 18CH	Low, negotiable	3-5 business days	Popular channel plans held in stock
Custom wavelength or channel plan, 2 to 18λ	Project based	7-10 business days	Any subset of the G.694.2 grid, odd counts supported
Bulk or OEM project	Volume based	Quoted per project	Factory direct pricing, scheduled batch delivery

 

FB-LINK is a dedicated CWDM Mux Demux manufacturer and OEM supplier in Shenzhen, building 4, 8, 10, 16 and 18 channel passive multiplexer modules across the full 1270 to 1610nm grid.

 

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