Gigalight SFP

Gigalight WDM transceivers – Get more out of your fibre

Gigalight WDM Transceivers

SFP+ and SFP28 transceiver modules now available with CWDM, LAN-WDM and DWDM options for higher density in single fibres.


Gigalight SFP


SFP28 products

The growing volume of SFP28 devices used in front-haul applications for 5G wireless means that the broadcast industry can profit from lower prices and innovation at 25Gbps for UHD transmission. And at 10Gbps SFP+ transceivers and switches, the backbone of HD in broadcast and increasingly uncompressed network systems for ProAV applications, have reduced in price to outstrip competition from traditional matrix switching.

In many applications where existing fibre installations must be used, wavelength division multiplexing can be deployed to increase channel density, and with lower prices this option becomes more feasible compared to laying new fiber. For a general overview of using different wavelengths to multiplex light onto a single fiber take a look at this previous link Understanding 100G QSFP Optics

Based on the principle of reusing WDM standards, the industry developed a variety of solutions for 25G colored optical transceiver modules. Now we’ll look at the different multiplexing schemes in more detail and see how 5G wireless systems are re-using data-center

25G SFP28 CWDM/MWDM/LWDM/DWDM Colored Optical Transceiver Modules


The CWDM standard is defined in ITU-T G.694.2. There are 18 wavelengths with 20nm spacing. CWDM transceiver modules use external  CWDM multiplexers/demultiplexers to combine and split the light into and from a single fiber. In the wireless fronthaul scenario with three channels, six wavelengths are required, preferably CWDM6 of 1271nm, 1291nm, 1311nm, 1331nm, 1351nm, and 1371nm. As the first four wavelengths are the same as those of CWDM4 DML in data centers, chip suppliers only needed to develop for industrial temperatures and the last two wavelengths. In the case of six channels, 12 wavelengths are required. Two CWDM6 and two fibers can be selected for transmission, or CWDM12 and one fiber can be used by adding the last six wavelengths of 1471nm, 1491nm, 1511nm, 1531nm, 1551nm, and 1571nm.

BiDi SFPs generally use two CWDM wavelengths to combine the Tx and Rx path within the SFP transceiver, so only one fiber. In the case of 25G Optics 1270nm & 1330nm are used.

8 Channel CWDM Mux/Demux from Flyin Optics



The channel spacing of the LWDM technology is 800GHz (approximately 4.4nm). More wavelengths can be obtained in the O-band with only a small dispersion penalty. IEEE 802.3 defines the 400GBASE-LR8 interface based on LWDM8 of 1273.54nm, 1277.89nm, 1282.26nm, 1286.66nm, 1295.56nm, 1300.05nm, 1304.58nm, and 1309.14nm. The last four wavelengths are used for 100GBASE-LR4. Therefore, the industry can readily support the last four wavelengths. If expanding to 12 wavelengths, the CCSA adds four wavelengths (1269.23nm, 1291.10nm, 1313.73nm, and 1318.35nm) to the LWDM8 wavelengths to form LWDM12.

Mini Lan WDM mux/demux from Flyin Optics


The DWDM technology is based on ITU-T G.698.4 and widely used in backbone and metro networks. The wavelength ranges from 1529nm to 1567nm, with a spacing of approximately 0.78nm. The number of wavelengths can be 6, 12, 20, 40, 48, or 96. However, DWDM transceiver modules tend to be more expensive and usually deployed in areas with very restricted fiber resource.

GIGALIGHT’s 25G SFP28 Optical Transceiver Modules Solutions

GIGALIGHT offers both 25G SFP28 grey optical transceiver modules and 25G SFP28 colored optical transceiver modules, which are all industrial grade. All the 25G optical transceiver modules comply with the SFP28 protocols SFF-8419 and SFF8472. Electrical ports comply with CEI-28G-VSR. The transceiver modules comply with 5G fronthaul CPRI/eCPRI specifications and IEEE 802.3 Ethernet standards, to support both 24.33Gb/s and 25.78Gb/s data rates. Customers can choose different options based on their performance needs and budget. The full series of 5G fronthaul 25G SFP28 optical transceiver modules cover various DRAN and CRAN application scenarios.

Gigalight WDM Transceivers – 25G SFP28 Grey Optical Transceiver Modules

The 25G SFP28 grey optical transceiver modules include dual-fiber portfolio and single-fiber portfolio, which can meet customers’ requirements for direct fiber connection in a wide range of scenarios.

  • The dual-fiber portfolio can offer 850nm SR solution for 100m transmission, 850nm CSR solution for 300m transmission, 1310nm LR Lite solution for 300m transmission, 1310nm LR solution for 10km transmission, 1310nm ER Lite solution for 30km/40km transmission, and 1310nm ER solution for 40km transmission.
  • The single-fiber portfolio can offer 1270/1330nm BiDi solution for 300m, 10km, 20km, and 40km transmission.

Gigalight WDM Transceivers – 25G SFP28 Colored Optical Transceiver Modules

The 25G SFP28 colored optical transceiver modules include CWDM portfolio, LWDM portfolio, and DWDM portfolio. These can meet customers’ requirements for WDM connections in a wide range of scenarios.

  • The CWDM portfolio can offer CWDM12 solution for 10km transmission and CWDM6 solution for 15km transmission.
  • The LWDM portfolio can offer LWDM12 solution for 10km/20km transmission and LWDM9 solution for 40km transmission.
  • The DWDM portfolio can offer 6CH, 12CH, 20CH, and 40CH DWDM solutions for 10km transmission.

Contact L2tek for more information on the WDM SFPs and passive components we have in stock. We will be happy to advise on the best parts to use in your application.