2.5G SFP Dual Fiber 1550nm DFB Up to 40km on SMF SFP Optical
Transceiver Module
Features
- Up to 2.5Gb/s data links
- 1310nm DFB laser transmitter and APD photo-detector
- Up to 40km on 9/125μm SMF
- Hot-pluggable SFP footprint
- Duplex LC/UPC type pluggable optical interface
- Metal enclosure, for lower EMI
- RoHS compliant and lead-free
- Support Digital Diagnostic Monitoring interface
- Single +3.3V power supply
- Compliant with SFF-8472
- Operating case temperature:
Commercial : 0 to +70°C
Industrial : -40 to +85°C
Applications
- Switch to Switch Interface
- Gigabit Ethernet
- Switched Backplane Applications
- Router/Server Interface
- Other Optical Links
Description
The SFP transceivers are high performance, cost effective modules
supporting dual data-rate of 2.5Gbps and 40km transmission distance
with SMF.
The transceiver consists of three sections: a DFB laser
transmitter, a APD photodiode integrated with a trans-impedance
preamplifier (TIA) and MCU control unit. All modules satisfy class
I laser safety requirements.
The transceivers are compatible with SFP Multi-Source Agreement
(MSA) and SFF-8472. For
further information, please refer to SFP MSA.
Absolute Maximum Ratings
Table 1 - Absolute Maximum Ratings
| Parameter | Symbol | Min | Max | Unit |
| Supply Voltage | Vcc | -0.5 | 4.5 | V |
| Storage Temperature | Ts | -40 | +85 | °C |
| Operating Humidity | - | 5 | 85 | % |
Recommended Operating Conditions
Table 2 - Recommended Operating Conditions
| Parameter | Symbol | Min | Typical | Max | Unit |
| Operating Case Temperature | Standard | Tc | 0 | | +70 | °C |
| Industrial | -40 | | +85 | °C |
| Power Supply Voltage | Vcc | 3.13 | 3.3 | 3.47 | V |
| Power Supply Current | Icc | | | 300 | mA |
| Data Rate | | | 2.5 | | Gbps |
Optical and Electrical Characteristics
Table 3 - Optical and Electrical Characteristics
| Parameter | Symbol | Min | Typical | Max | Unit | Notes |
| Transmitter |
| Centre Wavelength | λc | 1280 | 1310 | 1340 | nm | |
| Spectral Width (-20dB) | ∆λ | | | 1 | nm | |
| Side Mode Suppression Ratio | SMSR | 30 | | | dB | |
| Average Output Power | Pout | -2 | | +3 | dBm | 1 |
| Extinction Ratio | ER | 9 | | | dB | |
| Optical Rise/Fall Time | tr/tf | | | 0.16 | ns | |
| Data Input Swing Differential | VIN | 400 | | 1800 | mV | 2 |
| Input Differential Impedance | ZIN | 90 | 100 | 110 | Ω | |
| TX Disable | Disable | | 2.0 | | Vcc | V | |
| Enable | | 0 | | 0.8 | V | |
| TX Fault | Fault | | 2.0 | | Vcc | V | |
| Normal | | 0 | | 0.8 | V | |
| Receiver |
| Centre Wavelength | λc | 1260 | | 1580 | nm | |
| Receiver Sensitivity | | | | -28 | dBm | 3 |
| Receiver Overload | | -9 | | | dBm | 3 |
| LOS De-Assert | LOSD | | | -30 | dBm | |
| LOS Assert | LOSA | -40 | | | dBm | |
| LOS Hysteresis | | 1 | | 4 | dB | |
| Data Output Swing Differential | Vout | 370 | | 1800 | mV | 4 |
| LOS | High | 2.0 | | Vcc | V | |
| Low | | | 0.8 | V | |
| | | | | | | | |
Notes:
1. The optical power is launched into SMF.
2. PECL input, internally AC-coupled and terminated.
3. Measured with a PRBS 27-1 test pattern @2500Mbps, BER ≤1×10-12
4. Internally AC-coupled.
Timing and Electrical
Table 4 - Timing and Electrical
| Parameter | Symbol | Min | Typical | Max | Unit |
| Tx Disable Negate Time | t_on | | | 1 | ms |
| Tx Disable Assert Time | t_off | | | 10 | µs |
| Time To Initialize, including Reset of Tx Fault | t_init | | | 300 | ms |
| Tx Fault Assert Time | t_fault | | | 100 | µs |
| Tx Disable To Reset | t_reset | 10 | | | µs |
| LOS Assert Time | t_loss_on | | | 100 | µs |
| LOS De-assert Time | t_loss_off | | | 100 | µs |
| Serial ID Clock Rate | f_serial_clock | | | 400 | KHz |
| MOD_DEF (0:2)-High | VH | 2 | | Vcc | V |
| MOD_DEF (0:2)-Low | VL | | | 0.8 | V |
Diagnostics
Table 5 – Diagnostics Specification
| Parameter | Range | Unit | Accuracy | Calibration |
| Temperature | 0 to +70 | °C | ±3°C | Internal / External |
| -40 to +85 |
| Voltage | 3.0 to 3.6 | V | ±3% | Internal / External |
| Bias Current | 0 to 100 | mA | ±10% | Internal / External |
| TX Power | -2 to +3 | dBm | ±3dB | Internal / External |
| RX Power | -30 to -9 | dBm | ±3dB | Internal / External |
