CWDM SFP Transceivers

CWDM SFP is based on the SFP form factor which is a MSA standard build. The max speed of this product is 1.25G and they are also available as 2.5G 4G and of course the popular 10G CWDM SFP+.

These optics are mostly deployed in 1G Ethernet but can also be deployed as 1x Fiber channel. The CWDM SFP has a specific laser which emits a “color” defined in the CWDM ITU grid. The CWDM ITU grid is defined from 1270 to 1610nm and has steps of 20nm. So the available wavelength is: 1270nm, 1290nm, 1310nm, 1330nm, 1350nm, 1370nm, 1390nm, 1410nm, 1430nm, 1450nm, 1470nm, 1490nm, 1510nm, 1530nm, 1550nm, 1570nm, 1590nm and 1610nm.

The official naming defined by the MSA community is: 1271nm, 1291nm, 1311nm, 1331nm, 1351nm, 1371nm, 1391nm, 1411nm, 1431nm, 1451nm, 1471nm, 1491nm, 1511nm, 1531nm, 1551nm, 1571nm, 1591nm and 1611nm but in the industry the naming ending with the “0” is mostly adopted.

Solid-Optics always uses the part names of the Vendor for which it is compatible, so for Cisco we are using the original name including the extra parameters. Cisco original naming is CWDM-SFP-1550-DOM= we are adding the power budget (24dB) and make a clear distinction that it is a Solid-Optics product by adding “–SO” at the end. The complete part name is CWDM-SFP-1550-DOM-24dB-SO.

All CWDM optics come with DOM/DDM which stands for "Digital optical monitoring" or "Digital Diagnostic Monitoring" which will enable you to measure in real time, the temperature, Voltage Tx laser output and Rx laser input.

We offer 4 different versions of power budget: 24dB, 32dB, 37dB and 41dB. The 24dB CWDM SFP can reach around 80km depending on the nanometer, MUX quality and fiber quality. Because the attenuation on the lower bands (<1470) is higher, we mention 50km on the label. The 32dB can reach  around 120km. The 37dB can reach around 150km. The strongest version is the 41dB which can reach around 200km, to reach this you will need our ULTRA-MUX and the attenuation on the fiber should be within specs. These can be connected to each other without the need for a mux.

Solid Optics can make the SFP CWDM compatible with every brand. A lot of brands have vendor locking and only with the proper coding. Solid optics is specialized in this rebranding or recoding. We have more the 20 different Switches and Routers in our test lab to test the coding. Brands like Cisco, HP, H3C, Juniper, Huawei, Brocade, Arista. Please ask us for more information on compatibility, we can also provide you with our Multi-Fiber-Tool to recode or tune the optics on site.

The CWDM SFP has a course calibrated laser. Even with calibrated lasers, temperature fluctuation will cause the wavelength to shift. For this reason the CWDM MUX window is approximately 15nm wide. Especially 1G CWDM optics are far cheaper than their DWDM counterparts. This is due to the necessity to electrically cool the DWDM laser to keep the wavelength from shifting.

Solid Optics test all these optics individually in our test lab, we test for compatibility on various brands, and use different Optical Spectrum Analyzers to ensure the optic is emitting the right color and has the correct power budget.

The CWDM SFP is used in combination with Passive muxes, we can provide you a complete solution and advise on which equipment fits best in your project. Please give us your project details and we will provide the most efficient and economical solution.