1.25G BiDi SFP 120km Transceiver (Side B): BIDI-1.25G-SFP-120-BD
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1.25G BiDi SFP 120km Side B Overview
The BIDI-1.25G-SFP-120-BD is a 1.25G BiDi SFP for single fiber bidirectional links over single mode fiber, transmitting at 1550nm and receiving at 1490nm. It is the Side B half of a matched pair and must be installed opposite a Side A unit running TX 1490nm and RX 1550nm on the far end. A 31dB average link budget, DFB laser transmitter, and APD photodiode receiver support links up to 120km on a single LC/UPC connector, well beyond the 10km reach class defined by IEEE 802.3ah 1000BASE-BX10. TX wavelength bandwidth spans 40nm from 1530 to 1570nm, RX wavelength bandwidth spans 40nm from 1470 to 1510nm, and chromatic dispersion across the link is rated 2600 to 2700 ps/nm. The module covers Gigabit Ethernet at 1.25 Gbps and 1G Fibre Channel at 1.0625 Gbps, with DDM/DOM monitoring for real time optical diagnostics. Operating temperature is 0 to 70C, power draw runs from a single +3.3V supply, and the module follows the SFP MSA and INF-8074i mechanical specification.
- Media Type: Single-Mode Fiber (SMF)
- Fiber Count: BiDi
- Connector: Single LC/UPC
- Maximum Distance: 120 km
- Average Link Budget: 31 dB
- Tx Wavelength: 1550 nm
- Supported Data Rate: 0.1 Gbps - 1.25 Gbps
- DDM/DOM: Supported
- Temperature Range: Standard 0°-70°C
1.25G BiDi SFP 120km Pricing
SKU:BIDI-1.25G-SFP-120-BD
Made to Order - 2 Weeks1.25G BiDi SFP 120km Transceiver (Side B) Specification
Form Factor | SFP |
Media Type | Single-Mode Fiber (SMF) |
Fiber Count | BiDi |
Connector | Single LC/UPC |
Maximum Distance | 120 km |
Average Link Budget | 31 dB |
TX Wavelength | 1550 nm |
RX Wavelength | 1490 nm |
Supported Data Rate | 0.1 Gbps - 1.25 Gbps |
Supported Ethernet Applications | Gigabit Ethernet (1.25 Gbps), 100M Ethernet (100Mbps) |
Supported Fiber Channel Applications | 1G Fiber Channel (1.0625 Gbps) |
DDM/DOM | Supported |
Tx Wavelength Bandwidth | 40 nm (1530-1570 nm) |
Rx Wavelength Bandwidth | 40 nm (1470-1510 nm) |
Minimum Transmitting Power | 0 dBm |
Maximum Transmitting Power | 5 dBm |
Receiver Sensitivity | -31 dBm |
Receiver Overload | -7 dBm |
Dispersion | 2600-2700 ps/nm ps/nm |
Transmitter Type | DFB Laser |
Receiver Type | APD Photodiode |
Temperature Range | Standard 0°-70°C |
Power | +3.3V single power supply |
Compliance | CE, Class 1 FDA and IEC60825-1 Laser Safety Compliant, RoHS, INF-8074i, SFP MSA |
1.25G BiDi SFP 120km Transceiver (Side B) Datasheet
v5Complete technical specifications and product details
1.25G BiDi SFP 120km Transceiver (Side B) Description
The BIDI-1.25G-SFP-120-BD is the Side B half of a 1.25G BiDi SFP pair for single fiber bidirectional links over single mode fiber. It transmits at 1550nm and receives at 1490nm, pairing with a Side A unit running TX 1490nm / RX 1550nm. A single LC/UPC connector and internal WDM diplexer carry both directions on one strand, halving fiber count versus a duplex pair.
IEEE 802.3ah defines 1000BASE-BX10 for a 10km bidirectional reach. This module exceeds that class through a 31dB average link budget built from a DFB laser transmitter and an APD photodiode receiver, whose added sensitivity supports the longer fiber run. It is an extended reach WDM design, not an IEEE 802.3ah certified part at 120km, since the standard defines no reach class at that distance.
Applications include carrier backbone, inter-city connectivity, utility grid, and pipeline monitoring links.
Supported rates run 1.063 to 1.25 Gbps for Gigabit Ethernet and 1G Fibre Channel. TX power is 0 to 5 dBm, receiver sensitivity −31 dBm, overload −7 dBm. DDM/DOM reports real time optical parameters.
The module ships in the standard hot swappable SFP form factor at +3.3V, rated 0 to 70C commercial, and follows the SFP MSA and INF-8074i specification with CE, Class 1 laser safety (FDA/IEC 60825-1), and RoHS compliance. EEPROM coding follows the MSA standard; verify against the host platform's optics compatibility list before deployment.
This module is made to order and carries a lifetime warranty, backed by 15+ years of EdgeOptic compatibility engineering across vendor optical platforms. For volume pricing or the matching Side A unit, contact our sales team.
Frequently Asked Questions
Which module do I need, the Side A or Side B 1.25G BiDi 120km unit?
This product is the Side B unit: it transmits at 1550nm and receives at 1490nm. It must be paired with a Side A unit running the mirrored wavelength set, transmitting at 1490nm and receiving at 1550nm, on the far end of the link. Both ends are rated for the same 120km reach and 31dB link budget; installing two Side B units, or two Side A units, on the same link will not establish a connection.
How does a 1.25G BiDi SFP reach 120km when IEEE 802.3ah 1000BASE-BX10 is only rated to 10km?
IEEE 802.3ah defines 1000BASE-BX10 for a 10km reach class. This module exceeds that class through an extended reach WDM design: a 31dB average link budget, a DFB laser transmitter, and an APD photodiode receiver with higher sensitivity than a standard PIN receiver. It is not itself certified under IEEE 802.3ah at 120km, since the standard does not define a reach class at that distance; the 120km figure is this module's own extended reach optical budget.
How does single fiber bidirectional (BiDi) transmission work on one strand?
The module separates transmit and receive paths by wavelength rather than by fiber. An internal diplexer filter sends the 1550nm transmit signal out and routes the 1490nm receive signal to the photodiode, so both directions share one strand without interfering with each other. The Side A unit at the far end runs the mirrored pair, transmitting at 1490nm and receiving at 1550nm, which is why Side A and Side B units must always be installed as a matched set.