The aim of these four articles about optical transceivers is to familiarise potential users with the technology used in the modules, the potential solutions, functional differences, areas of application and possible integration with other GBC Photonics products.

GBC Photonics Simple Recode Device (SRD) is a professional device designed to alter the configuration of optical transceivers (SFP/SFP+/XFP/QSFP+/QSFP28/CFP/CFP2/CFP4) by modifying their memory in accordance with appropriate MSA standards. It also enables you to alter the wavelength, or channel number, in tuneable DWDM modules.

The SRD will reduce the purchase costs of optical transceivers because instead of buying a variety of transceivers compatible with particular devices from multiple manufacturers, you can use universal transceivers which can easily be reconfigured to work with any target device. This allows for a significant reduction in the cost of stock as you purchase just one type of transceiver with the aim of using them with a variety of devices, configuring them during installation. Therefore, you no longer need to keep large stocks of transceivers of different types to be able to address the needs of particular devices in your network infrastructure.


An SRD is one element of an ecosystem built on a private GBC Photonics cloud which hosts thousands of codes that the user of optical transceivers can benefit from when utilising this device.

GBC Photonics SRDs can also be used to provide remote technical support. You can diagnose a problem, apply new code and test in the user’s environment without having to send transceivers to technical support engineers for modification, and then back again. This significantly shortens the time needed to implement a change and cuts the costs of such operations.

Thanks to a Simple Recode Device, universal 100G single and dual rate transceivers can be programmed to work with network devices from multiple brands. Additionally, in the case of dual rate transceivers, an SRD will easily allow you, with just one click, to set a default mode for transceivers to work on Ethernet or OTU4 if the target devices are designed to operate using only one of these standards. This feature makes these transceivers even more universal and useful.

Single and dual rate optical modules in GBC Photonics’ portfolio are as follows:

QSFP28 SR4 850nm 100m MPO SINGLE RATE 100GbE Multi Mode VCSEL+PIN   
QSFP28 LR4 CWDM (1270/1290/1310/1330nm) 2km LC SINGLE RATE 100GbE Single Mode DML+PIN   
QSFP28 LR4 1310nm 10km LC SINGLE RATE 100GbE Single Mode DML+PIN   
QSFP28 LR4 1310nm 10km LC DUAL RATE 100GbE/OTU4 Single Mode EML+PIN   
QSFP28 eLR4 1310nm 25km LC DUAL RATE 100GbE/OTU4 Single Mode EML+PIN   
QSFP28 ER4 1310nm 40km LC SINGLE RATE 100GbE Single Mode DML+APD   
QSFP28 ER4 1310nm 40km LC DUAL RATE 100GbE/OTU4 Single Mode EML+PIN SOA   
QSFP28 ZR4 1310nm 80km LC SINGLE RATE 100GbE Single Mode EML+PIN SOA   
QSFP28 DWDM 80km LC SINGLE RATE 100GbE xxch 19x.x0THz 100GHz Single Mode DFB   

GBC Photonics constantly undertakes research projects and develops its products so that they can work for you, not you for them.

Do you have any questions?