BIDI 1.25G SFP Module for Single-Fibre Links
The BIDI 1.25G SFP module carries a bidirectional link over a single fibre strand, transmitting on one wavelength and receiving on the other, and it is listed for up to 25km on single-mode fibre. Two transmitter versions are covered on this single page, because the source page lists them as versions of one title rather than as two separate products with separate detail pages.
Two versions on one page
The two versions are distinguished by their transmitter laser: an FP laser transmitter version, listed as TOP-BIDI-1.25G-25AD, and a DFB laser transmitter version, listed as TOP-BIDI-1.25G-25BD. Both versions share the listed rate of up to 1.25 gigabits per second, the wavelength pair of 1310nm and 1550nm, the distance of up to 25km on 9/125 micrometre single-mode fibre, and the BIDI LC/UPC pluggable optical interface. The version distinction is the laser type, and an enquiry should name which version is wanted or ask for the pairing to be confirmed.
A BIDI link needs a matched pair, with one end transmitting on one wavelength and the other end transmitting on the other. Ordering two modules of the same version does not make a working link, because both ends would transmit on the same wavelength. State in the enquiry that a pair is required and name both ends, so the pairing is confirmed as part of the order rather than discovered at installation.
Listed figures for this module
The specification values listed for this module include an optical extinction ratio of 9 dB, a 3.3V power supply, and a certificate entry of CE in the source table, with no certificate number published. Temperature is listed in three grades on the source page: commercial 0 degrees Celsius to 70 degrees Celsius, extended minus 10 degrees Celsius to 80 degrees Celsius, and industrial minus 40 degrees Celsius to 85 degrees Celsius. The grade that applies to an order should be named in the enquiry, because the three grades are different products of the same title family in practice.
Compliance statements listed on the source page are RoHS compliant and lead-free, SFF-8472, IEEE 802.3-2005, Telcordia GR-468-CORE, and FCC 47 CFR Part 15 Class B. Those are source-page statements, and a buyer who needs a particular compliance document for a specific version should name the document in the enquiry so the correct document can be checked. No certificate numbers are published on this site.
Where this module fits
The listed applications for this module are switch-to-switch interfaces, Fast Ethernet, switched backplane applications, router and server interfaces, and other optical links. Those applications describe where a 1.25G single-fibre link is normally used, particularly where only one fibre strand is available between two points or where fibre count is the constraint. The 25km distance suits inter-building and campus links rather than short in-room runs, where a shorter-distance module would be the more economical choice.
This page covers only the 25km versions. Other bidirectional titles in the source material, including different distances and wavelength pairs, have no detailed specification behind them on this site and are not product pages here. A bidirectional requirement at a different distance or wavelength pair should be sent as an enquiry with the full link parameters.
Specification - as listed for this model
| Item | Listed value |
|---|---|
| Models on this page | TOP-BIDI-1.25G-25AD (FP laser transmitter) and TOP-BIDI-1.25G-25BD (DFB laser transmitter) - two versions of one title, one page |
| Rate | Up to 1.25 Gb/s |
| Wavelength pair | 1310nm / 1550nm (bidirectional pair) |
| Distance | Up to 25km on 9/125 micrometre single-mode fibre (SMF) |
| Interface | BIDI LC/UPC type pluggable optical interface |
| Form factor | SFP |
| Fibre type | SMF |
| Optical extinction ratio | 9 dB |
| Power supply | 3.3V |
| Temperature - commercial | 0 to +70 degrees Celsius |
| Temperature - extended | -10 to +80 degrees Celsius |
| Temperature - industrial | -40 to +85 degrees Celsius |
| Certificate entry in source table | CE (no certificate number published) |
| Compliance statements on source page | RoHS compliant and lead-free; SFF-8472; IEEE 802.3-2005; Telcordia GR-468-CORE; FCC 47 CFR Part 15, Class B |
Values above are taken from the listed specification for this model only. They are not a range-wide promise. Items not listed here are confirmed per model in the enquiry, and any conflict inside the source pages is flagged on the page rather than resolved by choosing one value.
Enquiry checklist
Before sending an enquiry, note the model or the rate you need, the wavelength, the fibre type, the distance, the connector, the quantity and the application. State whether the module must be compatible with a named host platform, and name any certification document you need. Minimum order quantity and lead time are unavailable at company level and are confirmed per model in the enquiry. Quotations are confirmed per order.
Send an enquiry | Sales contact: Ms. Vicky Tian, Sales Manager, +86 19860146913 | Telephone: 86-0755-82552969 | Email: dsale@topsfp.com
Frequently asked questions
Do I order one module or a pair?
A BIDI link needs a matched pair: one end transmits on one wavelength and receives on the other, and the far end does the reverse. State in the enquiry that a pair is required so the pairing is confirmed as part of the order.
Which version do I need, AD or BD?
The versions differ by transmitter laser type: AD uses an FP laser transmitter and BD uses a DFB laser transmitter. Name the version in the enquiry, or ask for the pairing and version to be confirmed for your link.
How do I get a quotation?
Send an enquiry naming the model, the rate, the wavelength, the distance and the quantity you need, plus the application. Quotations are confirmed per order, and specifications are confirmed per model before payment. This site does not list fixed selling figures, and no price is shown for any model.
What certification documents can you provide?
The company states ISO 9001, CE, FC, 3C and RoHS names. Certificates are available upon request. If a buyer needs a certificate for a specific model, name the model in the enquiry so the correct document can be checked. No certificate numbers are published on this site.
Do the specifications on one page apply to the whole range?
No. Specifications are shown per model and must not be read across the whole range. Where a value is not listed for a model, the page says to confirm per model rather than filling in a generic figure, and where the source pages disagree, the page flags the conflict instead of choosing one value as fact.
What are the minimum order quantity and lead time?
At company level both are unavailable on this site and are confirmed per model in the enquiry. A single-model note, where one exists, is marked as applying to that model only and must not be read as a company-wide term.