25 Gigabit 1310nm SFP28 LR Fiber Optic Transceiver
Description of 25g SFP28 Module
Sopto 1310 nm DFB 25 Gigabit SFP28 transceiver is designed to
transmit and receive optical data over single mode optical fiber
for link length 10km.
The SFP28 LR module electrical interface is compliant to SFI
electrical specifications. The transmitter input and receiver
output impedance is 100 Ohms differential. Data lines are
internally AC coupled. The module provides differential termination
and reduce differential to common mode conversion for quality
signal termination and low EMI. SFI typically operates over 200 mm
of improved FR4 material or up to about 150mmof standard FR4 with
one connector.
The transmitter converts 25Gbit/s serial PECL or CML electrical
data into serial optical data compliant with the 25GBASE-LR
standard. An open collector compatible Transmit Disable (Tx_Dis) is
provided. Logic “1” or no connection on this pin will disable the
laser from transmitting. Logic “0” on this pin provides normal
operation. The transmitter has an internal automatic power control
loop (APC) to ensure constant optical power output across supply
voltage and temperature variations. An open collector compatible
Transmit Fault (Tx_Fault) is provided. TX_Fault is module output
contact that when high, indicates that the module transmitter has
detected a fault condition related to laser operation or safety.
The TX_Fault output contact is an open drain/collector and shall be
pulled up to the Vcc_Host in the host with a resistor in the range
4.7-10 kΩ. TX_Disable is a module input contact. When TX_Disable is
asserted high or left open, the SFP28 module transmitter output
shall be turned off. This contact shall be pulled up to VccT with a
4.7 kΩ to 10 kΩ resistor
The receiver converts 25Gbit/s serial optical data into serial
PECL/CML electrical data. An open collector compatible Loss of
Signal is provided. Rx_LOS when high indicates an optical signal
level below that specified in the relevant standard. The Rx_LOS
contact is an open drain/collector output and shall be pulled up to
Vcc_Host in the host with a resistor in the range 4.7-10 kΩ, or
with an active termination. Power supply filtering is recommended
for both the transmitter and receiver. The Rx_LOS signal is
intended as a preliminary indication to the system in which the
SFP28 is installed that the received signal strength is below the
specified range. Such an indication typically points to
non-installed cables, broken cables, or a disabled, failing or a
powered off transmitter at the far end of the cable.
Features of 25g SFP28 Module
● Up to 25.78Gb/s bi-directional data links
● 1310nm DFB transmitter, PIN photo-detector
● 2-wire interface for management specifications compliant with SFF
8472 digital diagnostic monitoring interface for optical
transceivers
● Operating case temperature:
● 0 °C to 70°C
● Advanced firmware allow customer system encryption information to
be stored in transceiver
● Cost effective SFP28 solution, enables higher port densities and
greater bandwidth
● RoHS compliant
Applications
● 25GBASE-LR Ethernet
● High-speed storage area networks
● Computer cluster cross-connect
● Custom high-speed data pipes
● Inter Rack Connection
Specifications
| Product NO. | SPT-SFP28-LR |
| Wavelength | 1310nm |
| Product name | 25g SFP28 module |
| Transmission Distance | 10km |
| Operating temperature | Standard: 0 to +70°C |
| Date rate | 25Gbps |
| Aplications | 25GBASE-LR Ethernet |
| Package Type | SFP28 |
Optical Characteristics
The following optical characteristics are defined over the
Recommended Operating Environment unless otherwise specified.
| Parameter | Symbol | Min. | Typical | Max | Unit | Notes |
| Transmitter |
| Center Wavelength | λt | 1295 | | 1325 | nm | |
| Side Mode Suppression Ratio | SMSR | 30 | | | dB | |
| Average Optical Power | Pavg | -1.5 | | 2 | dBm | Note1 |
| Laser Off Power | Poff | | | -30 | dBm | |
| Extinction Ratio | ER | 3.5 | | | dB | |
| Transmitter Dispersion Penalty | TDP | | | 2.7 | dB | |
| Relative Intensity Noise | RIN20OMA | | | -130 | dB/Hz | |
| Optical Modulation Amplitude | OMA | -2 | | | dBm | |
| Receiver |
| Center Wavelength | λr | 1260 | | 1350 | nm | |
| Sensitivity (Average power) | Psens | -13.3 | | 2 | dBm |
BER = 1x10-12
|
| Unstressed receiver sensitivity(OMA) | Psens | | | -13 | dBm | BER = 1x10-6 |
| LOS Assert | LOSA | | | -13 | dBm | |
| LOS De-assert | LOSD | | | -12 | dBm | |
| LOS Hysteresis | LOSH | 0.5 | | | dB | |
| Return loss of receiver | | 26 | | | dB | |
| Average received power (overload) | | | | 2 | dBm | Note2 |
Notes:
[1]. Average optical power shall be measured using the methods
specified in TIA/EIA-455-95.
[2]. Maximum average received power is compatible with FC-PI-6-32G
while typical BER is less than 1x 10-12 .
Ordering information
| Part Number | Product Description |
| SPT-SFP28-LR | 25.78Gbps, 1310nm SFP28 LR 10km, 0ºC ~ +70ºC |
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