Cisco Compatible SFP-25G-SR-S Quick Spec:
SFP-25G-SR-S-EXT SFP-25G-SR-S-IND
Form Factor: SFP28 TX Wavelength: 850nm Reach: 100m
Cable Type: MMF Rate Category: 25G Interface Type: SR DDM: Yes
Connector Type: Dual-LC
Cisco Compatible SFP-25G-SR-S Features
Operating data rate up to 25.78Gbps
850nm VCSEL Transmitter
Distance up to 100m @50 / 125 um OM4
Distance up to 70m @50 / 125 um OM3
Single 3.3V Power supply
Duplex LC Connector Interface, Hot Pluggable
Built-in dual CDR
Electrical interface compliant to SFF-8431
Power Dissipation < 1.0W
Operating Case Temperature
Standard: 0°C to +70 °C
Extended -5°C to +85 °C
Industrial -40°C to +85 °C
Cisco Compatible SFP-25G-SR-S Applications
25GBase-SR
Product Description
The SFP-25G-SR-S is SFP28 module for duplex optical data, communications up to 25.78Gb/s. It is with the SFP+ 20-pin connector to allow hot plug capability, Digital diagnostic functions are available via an I2C. It has built-in clock and data recovery (CDR). This module is designed for multi-mode fiber and operates at a nominal wavelength of 850 nm. The
transmitter section uses a Vertical Cavity Surface Emitted Laser (VCSEL) and is a Class 1, laser compliant according to International Safety Standard IEC 60825. The receiver section uses, an integrated GaAs detector preamplifier (IDP) mounted in an optical header and a limiting post-amplifier IC.
ABSOLUTE MAXIMUM RATINGS
The operation in excess of any absolute maximum ratings might cause permanent damage to this module.
Parameter | Symbol | Min | Max | Unit | Notes |
Storage Temperature | TS | -40 | 85 | ℃ | |
Operating Case Temperature | TOP | 0 | 70 | ℃ | |
Power Supply Voltage | VCC | -0.5 | 3.6 | V | |
Relative Humidity (non-condensation) | RH | 5 | 85 | % |
RECOMMENDED OPERATING CONDITIONS
Parameter | Symbol | Min | Typical | Max | Unit | Notes |
Operating Case Temperature | TOP | 0 | 70 | degC | ||
Power Supply Voltage | VCC | 3.135 | 3.3 | 3.465 | V | |
Data Rate, | 25.7812 5 | Gb/s | ||||
Data Rate Accuracy | -100 | 100 | ppm | |||
Tx DISABLE Input Voltage –High | 2 | V | ||||
Tx DISABLE Input Voltage – Low | 0.8 | V | ||||
50 / 125 um MMF OM3 | D | 2 | 70 | m | ||
50 / 125 um MMF OM4 | D | 2 | 100 | m |
Optical Characteristics
All parameters are specified under the recommended operating conditions unless otherwise specified..
Parameter | Symbol | Min | Typical | Max | Unit | Notes |
Power Consumption | 1.0 | W | ||||
Supply Current | Icc | 300 | mA | |||
Transmitter | ||||||
Centre Wavelength | λC | 840 | 850 | 860 | nm | |
Spectral Width (RMS)@25Gb/s | Δλ | 8.2 | 0.6 | nm | ||
Average Output Power: 50 MMF | Pout | -8.4 | 2.4 | dBm | ||
Extinction Ratio | ER | 2 | dB | |||
Receiver | ||||||
Centre Wavelength | λC | 840 | 850 | 860 | nm | |
Receiver Sensitivity (OMA) | Smin | -8.4 | dBm | |||
Average Receiver Power | Pin | -10.3 | 3 | dBm | ||
Optical Return Loss | ORL | -12 | At 1MHz | |||
LOS De-Assert | LOSD | -13 | dB | |||
LOS Assert | LOSA | -30 | dB | |||
LOS Hysteresis | 0.5 | dB | ||||
Digital Diagnostic Functions
Digital diagnostics monitoring function is available on FluxLight’s product. A 2-wire serial interface provides user to contact with module. It is compliant to SFF-8472 Rev10.2 with internal calibration mode. For external calibration mode please contact our sales stuff.
Parameter | Symbol | Min | Max | Unit | Notes |
Temperature monitor absolute error | DMI_Temp | -3 | +3 | ℃ | |
Supply voltage monitor absolute error | DMI_VCC | -0.1 | +0.1 | V | |
TX power monitor absolute error | DMI_RX | -3 | +3 | dB | |
RX power monitor absolute error | DMI_RX | -3 | +3 | dB | |
Bias current monitor | DMI_Ibias | -10% | +10% | mA |
Recommended Circuit
Mechanical Dimensions
(Unit: mm [inch])
Pin Assignment and Description
Pin Assignment
PIN # | Symbol | Description | Notes |
1 | VeeT | Transmitter Ground | |
2 | TX_Fault | N/A | 1 |
3 | TX_DIS | Transmitter Disable | 2 |
4 | SDA | Tow Wire Serial Data | |
5 | SCL | Tow Wire Serial Clock | |
6 | MOD_DEF0 | Module present, connect to VeeT | |
7 | RS0 | N/A | 1 |
8 | LOS | LOS of Signal | 2 |
9 | RS1 | N/A | 1 |
10 | VeeR | Reciever Ground | |
11 | VeeR | Reciever Ground | |
12 | RD- | Reciever Data Inverted | |
13 | RD+ | Reciever Data Non-Inverted | |
14 | VeeR | Reciever Ground | |
15 | VccR | Reciever Supply 3.3V | |
16 | VccT | Transmitter Supply 3.3V | |
17 | VeeT | Transmitter Ground | |
18 | TD+ | Transmitter Data Non-Inverted | |
19 | TD- | Transmitter Data Inverted | |
20 | VeeT | Transmitter Ground |
Signals not supported in SFP+ Copper pulled-down to VeeT with 30K ohms resistor
Passive cable assemblies do not support LOS and TX_DIS
Licensing
The following U.S. patents are licensed by Finisar to FluxLight, Inc.:
U.S. Patent Nos: 7,184,668, 7,079,775, 6,957,021, 7,058,310, 6,952,531, 7,162,160, 7,050,720