Ascent’s 2.5 Gb/s 1310 nm Small Form-Factor Pluggable (SFP) transceiver is a flexible solution as an interface for switches, routers, servers, and other optical links. The transceiver consists of five sections: the LD driver, the limiting amplifier, the digital diagnostics monitor, the 1310 nm FP laser, and the PIN photo-detector. The module can carry data links up to 2 km in a 9/125 µm single mode fiber, and is compatible with the SFP Multi-Sourcing Agreement (MSA).
• Up to 2.5 Gb/s data links
• FP laser transmitter and PIN photodetector
• Up to 2 km on 9/125 µm SMF
• Hot-pluggable SFP footprint
• Duplex LC/UPC type pluggable optical interface
• Low power dissipation
• Metal enclosure, for lower EMI
• RoHS compliant and lead-free
• Supports the Digital Diagnostic Monitoring interface
• SFF-8472 compliant
Absolute Maximum Ratings
Parameter | Symbol | Min. | Typ. | Max. | Unit | Note |
Storage Temperature | Ts | ‑40 | 85 | °C | ||
Relative Humidity | RH | 5 | 95 | % | ||
Power Supply Voltage | VCC | ‑0.5 | 4 | V | ||
Signal Input Voltage | ‑0.3 | Vcc+0.3 | V | |||
Receiver Damage Threshold | 5 | dBm |
Recommended Operating Conditions
Parameter | Symbol | Min. | Typ. | Max. | Unit | Note |
Case Operating Temperature | Tcase | 0 | 70 | °C | SFP‑2G‑LP‑31‑2K | |
‑10 | 80 | SFP‑2G‑LP‑31‑2KE | ||||
‑40 | 85 | SFP‑2G‑LP‑31‑2KA | ||||
Power Supply Voltage | VCC | 3.13 | 3.3 | 3.47 | V | |
Power Supply Current | ICC | 280 | mA | |||
Power Supply Noise Rejection | 100 | mVp‑p | 100 Hz to 1 MHz | |||
Data Rate | 2500/2500 | Mbps | TX Rate/RX Rate | |||
Transmission Distance | 2 | kM | ||||
Coupled Fiber | Single‑mode fiber | 9/125 µm SMF |
Transmitter Specifications
Parameter | Symbol | Min. | Typ. | Max. | Unit | Note |
Average Output Power | POUT | ‑9 | ‑3 | dBm | 1 | |
Extinction Ratio | ER | 8.2 | dB | |||
Center Wavelength | λC | 1270 | 1310 | 1360 | nm | FP Laser |
Spectrum Bandwidth (RMS) | σ | 3.5 | nm | |||
Transmitter OFF Output Power | POff | ‑45 | dBm | |||
Differential Line Input Impedance | RIN | 90 | 100 | 110 | Ω | |
Output Eye Mask | Compliant with G.957(class 1 laser safety) | 2 |
Notes:
1: Measured at a 2^23‑1 NRZ PRBS pattern
2: Transmitter eye mask definition
x3‑x2 | 0.2 |
y1 | 0.25 |
y2 | 0.75 |
y3 | 0.25 |
y4 | 0.25 |
Receiver Specifications
Parameter | Symbol | Min. | Typ. | Max. | Unit | Note |
Input Optical Wavelength | λIN | 1270 | 1610 | nm | PIN‑TIA | |
Receiver Sensitivity | PIN | ‑18 | dBm | 1 | ||
Input Saturation Power (Overload) | PSAT | ‑3 | dBm | |||
Loss of Signal Assert | PA | ‑19 | dBm | |||
Loss of Signal De‑assert | PD | ‑35 | dBm | 2 | ||
LOS Hysteresis | PA‑PD | 0.5 | 2 | 6 | dB |
Notes
1: Measured with light source 1310 nm, ER=8.2 dB; BER =< 10^‑12 @PRBS=2^23‑1 NRZ
2: When LOS de‑asserted, the RX data+/‑ output is high‑level (fixed)
Electrical Interface Characteristics
Parameter | Symbol | Min. | Typ. | Max. | Unit | Notes |
Transmitter | ||||||
Total Supply Current | ICC | A | mA | 1 | ||
Transmitter Disable Input‑High | VDISH | 2 | Vcc+0.3 | V | ||
Transmitter Disable Input‑Low | VDISL | 0 | 0.8 | V | ||
Transmitter Fault Input‑High | VTxFH | 2 | Vcc+0.3 | V | ||
Transmitter Fault Input‑Low | VTxFL | 0 | 0.8 | V | ||
Receiver | ||||||
Total Supply Current | ICC | B | mA | 1 | ||
LOSS Output Voltage‑High | VLOSH | 2 | Vcc+0.3 | V | LVTTL | |
LOSS Output Voltage‑Low | VLOSL | 0 | 0.8 | V |
Note:
1: A (TX) + B (RX) = 280 mA (Not include termination circuit)
Regulatory Compliance
Feature | Reference | Performance |
Electrostatic Discharge(ESD) | IEC/EN 61000‑4‑2 | Compatible with standards |
Electromagnetic Interference (EMI) | FCC Part 15 Class B EN 55022 Class B (CISPR 22A) | Compatible with standards |
Laser Eye Safety | FDA 21CFR 1040.10, 1040.11 IEC/EN 60825‑1, 2 | Class 1 laser product |
Component Recognition | IEC/EN 60950 , UL | Compatible with standards |
ROHS | 2002/95/EC | Compatible with standards |
EMC | EN61000‑3 | Compatible with standards |
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