When an ISP deploys the UISP-FIBER-OLT-XGS alongside an existing GPON network, the challenge is that GPON CPE (WaveFiber ONU, UF-WiFi6) and XGS/XG-PON CPE (UISP-FIBER-XGS, UISP-FIBER-XG) use different wavelengths that would interfere with each other on the same fibre if combined without filtering. The UACC-UF-WDM-XGS is a Wavelength Division Multiplexing module that combines XGS/XG-PON and GPON services into a single fibre distribution system — it separates and recombines these wavelengths cleanly, allowing both service types to coexist on the same fibre plant and passive splitters without interference.

In practice: an ISP can begin upgrading individual subscribers to XGS-PON (using the UISP-FIBER-XGS or UISP-FIBER-XG at the premises) while remaining subscribers stay on GPON, all on the same fibre infrastructure. No retrucking, no new fibre, no forced simultaneous cutover.

Port Layout — 8+8+8

The filter provides 8 COM (SC/UPC), 8 GPON (SC/UPC), and 8 XGS/XG-PON (SC/UPC) connectors — 24 SC/UPC ports total in a 1U rack chassis. The COM ports connect to the existing fibre distribution splitters; the GPON ports connect to the GPON OLT ports; the XGS/XG-PON ports connect to the XGS-PON OLT ports on the UISP-FIBER-OLT-XGS. One WDM Filter module handles up to 8 fibre distribution legs simultaneously.

Optical Performance

For GPON–COM port paths, the WDM Filter passes wavelengths in the 1290–1330 nm and 1480–1500 nm ranges with a maximum insertion loss of 1 dB and minimum isolation of 25 dB. For XGS/XG-PON–COM port paths, it passes 1260–1280 nm and 1575–1580 nm with the same 1 dB maximum insertion loss and 25 dB minimum isolation. Minimum return loss is 50 dB and maximum polarisation-dependent loss is 0.1 dB. These are passive optical components — no power required, nothing to configure, nothing to fail.

Fibre type is ITU-T G.657.A1 single-mode.

Compatibility

Compatible devices include the UISP-FIBER-OLT-XGS, UISP-FIBER-XG, UISP-FIBER-XGS, UF-WiFi6, UF-WIFI, UF-LOCO, and UF-Nano. In short: the full Ubiquiti UISP fibre CPE range on both the GPON and XGS-PON sides.

This is ISP/operator headend infrastructure. The WDM Filter is installed at the OLT/distribution side of the network, not at the customer premises. It is purchased by ISPs, network operators, and system integrators building or upgrading UISP fibre deployments — not by end subscribers.

Key Highlights

• Function: Passive WDM filter — combines GPON and XGS/XG-PON on a single fibre distribution system
• Ports: 8× COM (SC/UPC) + 8× GPON (SC/UPC) + 8× XGS/XG-PON (SC/UPC) = 24 total
• GPON–COM wavelengths: 1290–1330 nm + 1480–1500 nm
• XGS/XG-PON–COM wavelengths: 1260–1280 nm + 1575–1580 nm
• Max insertion loss: 1 dB (both paths)
• Min isolation: 25 dB | Min return loss: 50 dB | Max PDL: 0.1 dB
• Fibre type: ITU-T G.657.A1 single-mode
• Form factor: 1U rack mount | Metal enclosure
• Dimensions: 442 × 120 × 43.7 mm | Weight: 1.8 kg
• Power: None — fully passive
• Compatible OLT: UISP-FIBER-OLT-XGS
• Compatible CPE: UISP-FIBER-XG, UISP-FIBER-XGS, UF-WiFi6, UF-WIFI, UF-LOCO, UF-Nano
• NDAA Compliant: Yes

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