Optical Communication Products · Shenzhen, China
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Per-channel sweep reportFWDM Filter — 1310 / 1550 nm Combiner — FOT Fiber Optic
Configure the module below — the specification table updates live as you change channel count, package and connector.

FWDM Filter — 1310 / 1550 nm Combiner

SKU: FOT-WDM-FWDM · LAN WDM / MWDM / FWDM · Fully passive

Combine or split 1310 nm and 1550 nm on one fiber. Built to your channel plan and swept channel by channel before it ships.

2 – 3 portConfiguration
≤ 0.6 dBInsertion loss
≥ 45 dBIsolation
0 WFully passive
Wavelength pair
1310 / 1550 nm1310 / 1490 nm1550 / 1625 nm (OTDR)1490 / 1550 nm
Ports
3-port2-port
Package
Mini tubeABS boxLGX module
Connector
LC/UPCLC/APCSC/UPCSC/APC
Configured part numberFOT-WDM-FWDM
Request a Quote Request Datasheet
Ships worldwide
Custom channel plans
3-year warranty

Product Overview

A filter WDM combines widely separated bands — most commonly 1310 nm and 1550 nm — onto a single fiber, or splits them apart. It is the simplest and cheapest way to run a second service over an existing strand, and the standard building block for adding CATV overlay or a monitoring channel.

The optics are thin-film filter (TFF) based: dielectric filter stacks deposited on glass, aligned and epoxy-free bonded, then swept channel by channel before the unit is closed. There is nothing powered inside, so there is nothing to fail, no heat to remove and no software to patch — the module simply keeps working for the life of the plant.

Every unit is built to your channel plan and supplied with its measured sweep data: per-channel insertion loss, adjacent and non-adjacent isolation, return loss and PDL. Package, connector type, polish and pigtail length are all build options, and the filter platform is qualified to Telcordia GR-1221-CORE.

Technical SpecificationsUpdates with your selection

Optical
TypeThin-film filter WDM
Wavelengths1310 / 1550 nm
Ports3-port (common, pass, reflect)
Insertion Loss≤ 0.6 dB
Isolation≥ 45 dB
Return Loss≥ 50 dB
PDL≤ 0.15 dB
Mechanical & Environment
PackageMini tube, pigtailed
ConnectorLC/UPC
Operating Temp-5 °C to +70 °C
ComplianceTelcordia GR-1221-CORE, RoHS
Testing, Quality & Supply
Optical Test100% — every channel swept for insertion loss, isolation and return loss
Test ReportPer-unit measured data supplied with the shipment
TraceabilitySerialized; serial links to the sweep record and production batch
Environmental QualificationTelcordia GR-1221-CORE reliability testing on the filter platform
CustomisationChannel plan, port count, package, connector and pigtail length built to order
Lead TimeStock configurations 3–5 days; custom channel plans 7–10 days
Warranty3 years

Ordering Information

Part NumberConfigurationChannelsAvailability
FOT-WDM-FWDMStandard configuration—Build to order
FOT-WDM-FWDM-1349Wavelength pair: 1310 / 1490 nm—Build to order
FOT-WDM-FWDM-1562Wavelength pair: 1550 / 1625 nm (OTDR)—Build to order
FOT-WDM-FWDM-1495Wavelength pair: 1490 / 1550 nm—Build to order
FOT-WDM-FWDM-2PPorts: 2-port—Build to order

Part numbers are indicative. Send us the channel plan, package and connector and we confirm the exact build code on the quotation.

Quality & What's in the Box

Swept Channel by Channel

Insertion loss, isolation, return loss and PDL measured on every port of every unit.

Serialized & Traceable

Serial number links to the measured sweep record and the production batch.

Built to Your Plan

Channel list, port count, package, connector polish and pigtail length are all build options.

Packaging

Dust-capped and individually bagged with the test report, packed in export cartons.

Typical Applications

Metro & DCI

Multiply the capacity of leased or owned dark fibre without trenching a single extra strand.

Carrier Access & PON

Aggregate access rings and overlay new services onto fibre that is already lit.

5G Fronthaul & Backhaul

Colour the radio sites so one fibre pair serves a whole cluster of cells.

Enterprise & Campus

Join buildings, DR sites and storage replication over a single inter-site pair.

Frequently Asked Questions

What is the 1625 nm version for?

Out-of-band OTDR monitoring. You inject a 1625 nm test signal onto the live fiber through the FWDM, so the OTDR can watch the span continuously without disturbing 1310/1550 nm traffic.

Can you build a non-standard channel plan?

Yes — that is most of what we ship. Send the wavelength or ITU channel list, the port count, the package and the connector type on your RFQ and we build to it. Custom plans add only a few days to lead time.

How much loss should I budget for the passive layer?

Take the insertion loss shown for your channel count and double it, because you need a unit at each end of the link. Then add roughly 0.3 dB per mated connector pair and 0.1 dB per splice, and keep 3 dB of margin for ageing and future repairs before you compare against the transceiver's link budget.

Do you supply a measured test report?

Yes. Every unit is swept channel by channel and the measured insertion loss, isolation and return loss are supplied with the shipment. Sample reports can be provided in advance for tender documentation.

Related WDM Products

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LAN WDM / MWDM / FWDM

LAN WDM Mux/Demux Module

MWDM Mux/Demux Module — 5G Fronthaul
LAN WDM / MWDM / FWDM

MWDM Mux/Demux Module — 5G Fronthaul

CWDM Mux/Demux — 1U Rack Chassis
CWDM

CWDM Mux/Demux — 1U Rack Chassis

CWDM Mux/Demux — ABS Pigtailed Box
CWDM

CWDM Mux/Demux — ABS Pigtailed Box

Request a quote for this part

Tell us the platform and the quantity. An engineer checks the part against your switch and software version before quoting — if it will not work, we say so.

Goes to our engineers and the quotation desk together. Replies come from sales@topnetsystem.com, usually within one working day.