The speeding up of optical communication data center development is an inevitable trend; then, for suppliers, in order to maintain the priority competitiveness, it is necessary to constantly adjust the packaging of optical modules and continuously increase the transmission rate of optical modules. Then, before such a situation, the development of an optical module was born.

There are many types of optical module packages, including early 1*9 and GBIC, and now more popular optical module packages such as CFP and QSFP28.

The speed of optical modules is also 155M, 622M, 1.25G, 2.5G, 4.25G, 10G, 40G, and now 100G, 200G or even 400G optical modules.

Today, Xiaobian shares the 100G QSFP28 optical module for everyone.

The 100G QSFP28 optical module first appeared in 2013. After the development in recent years, 100G QSFP28 optical modules have been derived from multiple categories, each with different optical module standards and suitable for different transmission applications.

The following Xiaobian uses 100G QSFP28 CWDM4 2KM optical module as an example, detailed introduction to introduce detailed parameters of 100G QSFP28 optical module.

1 : 4- channel full duplex optical module

What is a 4-channel optical module?

The 4-channel optical module uses the same optical fiber, and both can transmit 4 channels of optical wavelengths simultaneously

2 : Transmission data rate up to 26 Gbps

This is easy to understand. 100G QSFP28 optical module transmission rate is 100G, and the optical module is transmitted using a 4-channel optical fiber transmission, so the transmission data rate up to 26Gbps per second.

3 : CDR circuit built in receiver and transmit channel

This is about the structure of the optical module.

The optical module consists of optoelectronic devices, functional circuits, and optical interfaces. The optoelectronic devices include two parts: transmit and receive.

The transmitting part is: inputting a certain bit rate of the electric signal to drive the semiconductor laser (LD) or the light emitting diode (LED) to emit a corresponding rate of modulated optical signal after being processed by an internal driver chip, and an internal optical power automatic control circuit is provided therein. The output optical signal power remains stable.

The receiving part is: After a certain code rate of the optical signal input module is converted into an electrical signal by the light detecting diode. After the preamplifier, the corresponding rate of the electrical signal is output.

4 : Low power consumption

The module power consumption of different model parameters is different, 100G is different according to the package, generally 3.5-9w. So the power consumption of this 100G QSFP28 optical module is < 3.5W, which is a good aspect.

5 : hot swap

According to the mode of use: optical modules can be classified as non-hot pluggable and hot pluggable;

6 : LC interface

Optical fiber connectors can be divided into FC type, SC type, LC type, ST type, and KTRJ type.

7: Temperature 0 °C to +70 °C

By observing the temperature of the optical module, you can know whether the optical module is an industrial-grade optical module or a commercial-grade optical module.

Commercial grade 0°C～+70°C; Industrial grade -40°C～+85°C

In addition to 100G QSFP28 optical modules, 100G QSFP28 high-speed cables have also been widely welcomed because this product can greatly reduce the cost of 100G short-distance transmission. There are two main types of 100G QSFP28 high-speed cables: QSFP28 to QSFP28 high-speed cable and QSFP28 to SFP28 high-speed cable.

Both ends of the QSFP28 to QSFP28 high-speed cable are QSFP28 fiber transceivers; QSFP28 to SFP28 high-speed cable has QSFP28 fiber transceivers on one end and 4 SFP28 fiber transceivers on the other. In general, the length of 100G QSFP28 high-speed cable does not exceed 5m.

Through today's introduction, we have a certain understanding of the performance parameters of the 100G QSFP28 optical module.

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