XGS-PON & GPON Combo OLT SFP+
Introduction
The XGS-PON & GPON Combo OLT SFP+ is a high-performance optical transceiver designed for modern Passive Optical Network (PON) deployments.
It enables the simultaneous operation of GPON and XGS-PON over a single fiber, allowing operators to smoothly evolve existing GPON networks to XGS-PON without replacing the physical fiber infrastructure.
The module is optimized for OLT-side applications, supporting long-reach access networks, wide temperature operation, and full compliance with ITU-T standards.
Key Features
• Combination of XGS-PON OLT and GPON OLT optical transceiver
• Supports GPON and XGS-PON coexistence on the same fiber
• Compliant with:
o ITU-T G.984.5 (2014) / Amd.2 (10/2020) – GPON
o ITU-T G.9807.1 – XGS-PON
• Optical Power Level (OPL): Class C++
• Single-fiber bidirectional (BiDi) transmission
• Integrated Digital Diagnostic Monitoring (DDM) via 2-wire interface
• SFP+ form factor, SC/UPC connector
• Designed for OLT applications
• Reach up to 20 km
• Industrial temperature range
Transmission Rates & Wavelengths
XGS-PON
• Downstream (Tx1):
o 9.953 Gbps @ 1577 nm (continuous mode)
• Upstream (Rx1):
o 9.953 Gbps / 2.488 Gbps @ 1270 nm (burst mode)
GPON
• Downstream (Tx2):
o 2.488 Gbps @ 1490 nm (continuous mode)
• Upstream (Rx2):
o 1.244 Gbps @ 1310 nm (burst mode)
Optical Components
• 1577 nm transmitter: EML laser with SOA
• 1490 nm transmitter: DFB laser
• 1270 nm receiver: APD-TIA, burst-mode
• 1310 nm receiver: APD-TIA, burst-mode
Optical Performance
Transmitters
• XGS-PON (1577 nm)
o Output power: 8 to 10 dBm
o SMSR: = 30 dB
o Extinction ratio: = 8.2 dB
• GPON (1490 nm)
o Output power: 7 to 10 dBm
o SMSR: = 30 dB
o Extinction ratio: = 8.2 dB
Receivers
• XGS-PON Rx (1270 nm)
o Sensitivity: -32 dBm
o Saturation: -10 dBm
• GPON Rx (1270 / 1310 nm)
o Sensitivity: -35 dBm
o Saturation: -10 / -12 dBm
Electrical Characteristics
• Power supply: +3.3 V
• Differential input swing: 100 – 850 mVp-p
• Differential output swing: 300 – 800 mVp-p
• Input impedance: 100 O
• Control interface: 2-wire I²C
Power Consumption
• Commercial temperature (C-temp): = 3.0 W
• Industrial temperature (I-temp): = 3.5 W
Environmental Specifications
• Operating temperature (industrial): -40 °C to +85 °C
• Operating temperature (commercial): 0 °C to +70 °C
• Storage temperature: -40 °C to +85 °C
• Operating humidity: 5 % to 85 % RH
Burst-Mode Timing Support
• Fully compliant burst-mode operation for:
o XGS-PON upstream
o GPON upstream
• Supports guard time, reset timing, and data recovery per ITU-T requirements
• Automatic signal-detect reset functionality
Mechanical Specifications
• Form factor: SFP+
• Pin configuration: 20-pin
• Fully compliant with standard SFP+ cages and connectors