1000BASE-BX SFP 20km Transceiver (1310/1490nm) (Side A): BIDI-1.25G-SFP-21-AD
Similar Products
Same use case, different specifications
1000BASE-BX SFP 20km (1310/1490nm) Side A Overview
Our 1000BASE-BX SFP 20km transceiver delivers extended single-fiber connectivity using 1310/1490nm wavelengths. Supporting 20km transmission over single-mode fiber, this BiDi module provides 15 dB link budget and multi-rate operation from 100 Mbps to 1.25 Gbps. Commercial temperature range 0-70°C with LC/UPC connector. Pair with Side B for bidirectional communication.
- Media Type: Single-Mode Fiber (SMF)
- Fiber Count: BiDi
- Connector: Single LC/UPC
- Maximum Distance: 20 km
- Average Link Budget: 15 dB
- Tx Wavelength: 1310 nm
- Supported Data Rate: 1.063 Gbps - 1.25 Gbps
- DDM/DOM: Supported
- Temperature Range: Standard 0°-70°C
1000BASE-BX SFP 20km (1310/1490nm) Pricing
SKU:BIDI-1.25G-SFP-21-AD
In Stock - Ships Next Business Day1000BASE-BX SFP 20km Transceiver (1310/1490nm) (Side A) Specification
Form Factor | SFP |
Media Type | Single-Mode Fiber (SMF) |
Fiber Count | BiDi |
Connector | Single LC/UPC |
Maximum Distance | 20 km |
Average Link Budget | 15 dB |
TX Wavelength | 1310 nm |
RX Wavelength | 1490 nm |
Supported Data Rate | 1.063 Gbps - 1.25 Gbps |
Supported Ethernet Applications | Gigabit Ethernet (1.25 Gbps) |
Supported Fiber Channel Applications | 1G Fiber Channel (1.0625 Gbps) |
DDM/DOM | Supported |
Tx Wavelength Bandwidth | 40 nm (1290-1330 nm) |
Rx Wavelength Bandwidth | 40 nm (1470-1510 nm) |
Minimum Transmitting Power | -9 dBm |
Maximum Transmitting Power | 3 dBm |
Receiver Sensitivity | -22 dBm |
Receiver Overload | -3 dBm |
Dispersion | 140-160 ps/nm ps/nm |
Transmitter Type | FP Laser |
Receiver Type | PIN 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 |
1000BASE-BX SFP 20km Transceiver (1310/1490nm) (Side A) Datasheet
v5Complete technical specifications and product details
1000BASE-BX SFP 20km Transceiver (1310/1490nm) (Side A) Description
The EdgeOptic BIDI-1.25G-SFP-21-AD is a 1000BASE-BX BiDi SFP transceiver for Gigabit Ethernet over a single strand of single-mode fiber, halving the fiber count needed for metro and campus links.
This module transmits at 1310nm and receives at 1490nm, running 1.063 to 1.25 Gbps. It is Side A of a matched BiDi pair and must be installed opposite the EdgeOptic BIDI-1.25G-SFP-21-BD Side B unit (1490nm transmit, 1310nm receive); never pair two of the same side. The link carries a 15 dB optical budget, an EdgeOptic extended reach rating of 20 km; verify fiber loss before deployment.
The transceiver is a hot pluggable SFP with a single LC/UPC connector and the standard SFP MSA interface per INF-8074i, fitting any standard SFP cage. DDM/DOM diagnostics report transmit power, receive power, temperature, and supply voltage via EEPROM.
Housed in the compact SFP form factor, the module runs across a standard 0 to 70 C range from a single 3.3V supply, keeping board space and power draw low in dense deployments.
The module supports Gigabit Ethernet at 1.25 Gbps and 1G Fibre Channel at 1.0625 Gbps over the SFP MSA interface. Verify host port support and end-to-end fiber loss against the 15 dB budget before deployment. It carries CE marking, Class 1 laser safety per FDA and IEC 60825-1, and RoHS compliance.
Typical deployments include metro access, campus backbone links, industrial segments, and carrier access networks. Ships next business day from EU stock with a lifetime warranty and 15+ years of EdgeOptic compatibility engineering. For volume pricing or the matched Side B unit, contact our sales team.
Frequently Asked Questions
Why do BiDi SFP transceivers have to be deployed in matched pairs?
BiDi modules send both directions of traffic over a single fiber strand using two different wavelengths, one per direction, instead of the two fibers a standard duplex SFP uses. This module transmits at 1310nm and receives at 1490nm. The far end unit must transmit at 1490nm and receive at 1310nm so the wavelengths line up across the link. Pairing two Side A units, or two units of the same side, leaves both ends transmitting on the same wavelength and receiving on the wrong one, so the link will not come up.
What is the difference between 1000BASE-BX10-U and 1000BASE-BX10-D?
The U and D labels describe the transmit and receive wavelengths at each end of a BiDi link. A -U (upstream) unit transmits at 1310nm and receives at 1490nm, which is this module. A -D (downstream) unit transmits at 1490nm and receives at 1310nm, matching the EdgeOptic BIDI-1.25G-SFP-21-BD Side B unit. The two must always be deployed as a pair, one -U and one -D, never two of the same type.
Can a BiDi SFP be plugged into a standard duplex SFP port?
Yes. The SFP host cage and electrical interface follow the standard SFP MSA (INF-8074i), the same interface a duplex SFP uses. The difference is optical, not electrical: a BiDi module has a single LC/UPC connector instead of two fiber ports, and it must be paired with an opposite wavelength BiDi unit at the far end rather than another duplex transceiver.
Which side do I need for my link, Side A or Side B?
This page covers Side A, BIDI-1.25G-SFP-21-AD, which transmits at 1310nm and receives at 1490nm. The far end of the link needs the Side B unit, BIDI-1.25G-SFP-21-BD, which transmits at 1490nm and receives at 1310nm. Order one of each per link; two Side A or two Side B units on the same run will not establish a connection.