The DSGio 1.25G Duplex SFP family consists of hot-pluggable optical transceivers designed for 1.25 Gbps duplex links using LC-terminated fiber. The series covers multimode 850 nm short-reach model up to 550 m and single-mode variants at 1310 nm and 1550 nm with reach options from 20 km to beyond 100 km using FP, DFB, PIN, or APD-based optical components depending on distance class. All modules operate from a single 3.3 V supply, comply with the SFP MSA and SFF-8472, and support digital diagnostic monitoring (DDM/DOM) for real-time measurement of temperature, supply voltage, and optical TX/RX power. Designed for general Ethernet (1000BASE-X) and Fibre Channel applications, the transceivers provide stable optical performance across standard operating temperatures (0 – 70 °C), industrial temperature range (-40 – 85 °C), and meet Class-1 laser safety and RoHS requirements for broad compatibility in switches, media converters, and network appliances.
Overview
Introduction
The “1.25G Duplex SFP” series is a family of compact, hot-pluggable optical transceiver modules that deliver up to 1.25 Gbps data rates over fiber. These SFP modules support duplex LC connectors, are compliant with the SFP MSA standard and SFF-8472 diagnostics, and operate from a single +3.3 V supply.
Depending on the model, they offer different reach and fiber types — from multimode fiber (MMF) up to ~550 m (850 nm version), to single-mode fiber (SMF) links reaching tens or even up to ~140 km (1550 nm version). These modules are designed to provide a cost-effective, standards-compliant solution for Gigabit Ethernet, fiber-channel, or other optical networking needs, offering flexibility depending on distance and fiber infrastructure.
Key Variants and Specifications
Variant / SKU | Wavelength / Fiber Type / Media | Max. Reach (approx.) | TX (Transmitter) Type & Output | RX (Receiver) Sensitivity / Detector | Connector / Interface / Compliance | Power, Temperature & Other Notes |
SFP-MM85G-550C SFP-MM85G-550I (SX – MMF short-reach) | 850 nm / Multimode Fiber (MMF) | 550m | 850 nm VCSEL; TX power > -9 to 0 dBm | PIN photodiode; RX sensitivity < -18 dBm | Duplex LC; SFP MSA; SFF-8472 diagnostics; hot-pluggable; complies with RoHS & laser-safety standards | Single 3.3 V supply; Standard: 0 – 70 °C; Industrial: -40 – 85 °C |
SFP-SM13G-20C SFP-SM13G-20I (SMF – 1310 nm “LX” medium-reach) | 1310 nm / Single-Mode Fiber (SMF) | 20 Km | 1310 nm FP laser; TX power > -9 to 0 dBm | PIN photodiode; RX sensitivity < -23 dBm | Single 3.3 V supply; Standard: 0 – 70 °C; Industrial: -40 – 85 °C | |
SFP-SM15G-40C SFP-SM15G-40I SFP-SM15G-80C SFP-SM15G-80I (SMF – 1550 nm long-reach “EX” / “ZX”) | 1550 nm / SMF | 40, 80 Km (depending on SKU) | 1550nm DFB laser; TX power > -5 to 0 dBm / Depending on Model | PIN photodiode; RX sensitivity < -23 dBm / Depending on Model | Single 3.3 V supply; Standard: 0 – 70 °C; Industrial: -40 – 85 °C | |
SFP-SM15G-100I SFP-SM15G-120I SFP-SM15G-140I (SMF – Extended long-reach up to 140 km “EX” / “EZX”) | 1550 nm / SMF | 100, 120, 140 Km (depending on SKU) | 1550nm DFB laser; TX power > 0 to +5 dBm / Depending on Model | Super TIA+PIN photo detector or Super TIA+APD; RX sensitivity < -28 dBm / Depending on Model | Single 3.3 V supply; Industrial: -40 – 85 °C |
Product Features
General Characteristics (applies to most/all variants):
· Data Rate: up to 1.25 Gbps (1000BASE-X / 1 G Fibre-Channel, etc.)
· Footprint: SFP (small form-factor pluggable), hot-swappable — meaning modules can be inserted/removed without powering down the host.
· Interface: Duplex LC connector (two-fiber: one for TX, one for RX) for duplex SFP variants.
· Compliance: SFP MSA standard, supports digital diagnostic monitoring (DDM/DOM) per SFF-8472 — allowing real-time monitoring of optical link parameters (received power, transmitted power, bias current, supply voltage and temperature.)
· Power: Single +3.3 V supply.
· Operating Environment: 0 °C to +70 °C (Standard) and –40 °C to +85 °C (Industrial Variants).
· Safety & Compliance: Class-1 laser safety compliant; RoHS compliant.
Features
SFP-MM85G-550C/I | SFP-SM13G-20C/I | SFP-SM15G-40C/I | SFP-SM15G-80C/I | SFP-SM15G-100I/120I/140I |
1.25Gbps, Multimode, 850nm, 550m | 1.25Gbps, Single-Mode, 1310nm, 20Km | 1.25Gbps, Single-Mode, 1550nm, 40Km | 1.25Gbps, Single-Mode, 1550nm, 80Km | 1.25Gbps, Single-Mode, 1550nm, 100/120/140Km |
· Supports bit rates up to 1.25Gbps · Hot-pluggable SFP footprint · 850nm VCSEL laser and PIN photodiode; supports transmission up to 550m over 50µm MMF · Compliant with SFP MSA and SFF-8472; features duplex LC receptacle · RoHS compliant · Single +3.3V power supply · Real-time digital diagnostic monitoring · Operating case temperature: o Commercial: 0°C to 70°C o Industrial: -40°C to 85°C | · Supports bit rates up to 1.25Gbps · Hot-pluggable SFP footprint · 1310nm FP laser and PIN photodiode; supports transmission up to 20Km over SMF · Compliant with SFP MSA and SFF-8472; features duplex LC receptacle · RoHS compliant · Single +3.3V power supply · Real-time digital diagnostic monitoring · Operating case temperature: o Commercial: 0°C to 70°C o Industrial: -40°C to 85°C | · Supports bit rates up to 1.25Gbps · Hot-pluggable SFP footprint · 1550nm DFB laser and PIN photodiode; supports transmission up to 40Km over SMF · Compliant with SFP MSA and SFF-8472; features duplex LC receptacle · RoHS compliant · Single +3.3V power supply · Real-time digital diagnostic monitoring · Operating case temperature: o Commercial: 0°C to 70°C o Industrial: -40°C to 85°C | · Supports bit rates up to 1.25Gbps · Hot-pluggable SFP footprint · 1550nm DFB laser and PIN photodiode; supports transmission up to 80Km over SMF · Compliant with SFP MSA and SFF-8472; features duplex LC receptacle · RoHS compliant · Single +3.3V power supply · Real-time digital diagnostic monitoring · Operating case temperature: o Commercial: 0°C to 70°C o Industrial: -40°C to 85°C | · Supports bit rates up to 1.25Gbps · Hot-pluggable SFP footprint · (SFP-SM15G-100I) 1550nm DFB laser and Super TIA+PIN photo detector; supports transmission up to 100Km over SMF · (SFP-SM15G-120I) 1550nm DFB laser and Super TIA+PIN photo detector; supports transmission up to 120Km over SMF · (SFP-SM15G-140I) 1550nm DFB laser and Super TIA+APD photo detector; supports transmission up to 140Km over SMF · Compliant with SFP MSA and SFF-8472; features duplex LC receptacle · RoHS compliant · Single +3.3V power supply · Real-time digital diagnostic monitoring · Operating case temperature: o Industrial: -40°C to 85°C |
