In today's era of data explosion, high-speed and stable data transmission has become a demand of various industries. As an important component of 100G network, the core component 100G QSFP28 dual-fiber optical module has attracted much attention. Today, we will deeply analyze the four mainstream models of 100G QSFP28 dual-fiber optical modules: QSFP28-100G-SR4, QSFP28-100G-LR4, QSFP28-100G-ER4 and QSFP28-100G-ZR4.

1. QSFP28-100G-SR4 Working Principle

The QSFP28-100G-SR4 optical module is a parallel 100G optical module with 4 25G NRZ multimode parallel technology. At the transmitting end, the electrical signal is converted into an optical signal by a laser array and then transmitted in parallel on a ribbon multimode optical fiber; at the receiving end, a photodetector array converts the parallel optical signal into a parallel electrical signal.

The MPO 12-core multimode optical fiber (OM3/OM4) can achieve a transmission distance of 100m or 300m. This model supports the 100GBASE-SR4 Ethernet standard and is suitable for short-distance, high-density data center interconnection.

Advantages:

2. QSFP28-100G-LR4 Working Principle

Using 4-channel 25G NRZ wavelength division multiplexing technology (LWDM4) converts 4-channel 25Gbps electrical signals into 4-channel LAN WDM optical signals are then multiplexed into a single channel to achieve 100G optical transmission. At the receiving end, the 100G optical input is demultiplexed into 4 LAN The WDM optical signal is then converted into 4 electrical signal output channels.

The transmission distance is 10km or 20km through single-mode optical fiber (OS2) with duplex LC interface. This model complies with the 100GBASE-LR4 Ethernet standard and is suitable for metropolitan area networks and data center interconnection.

Advantages:

1. Supports line rates of 103.125 Gbps ;

2. The transmission data rate per channel is up to 25.78 (NRZ) ;

3. 12C interface with integrated digital diagnostic monitoring ;

4. Complies with EU Directive 2015/863/EU .

3. QSFP28-100G-ER4 Working Principle

This optical module is designed to comply with Ethernet 100G The 100Gb/s module is designed for BASE-ER4 standard optical communication applications. It converts 4-way 25Gb/s electrical data input into 4-way LAN WDM optical signals are then multiplexed into a single channel for 100Gb/s optical transmission. At the receiving end, the 100Gb/s optical input is demultiplexed into 4 LAN The WDM optical signal channel is then converted into 4 electrical signal output channels.

Achieve transmission distance up to 40km via single-mode fiber. This model supports 100GBASE-ER4 Ethernet standard and is suitable for long-distance data center interconnection and telecommunication networks.

Advantages:

1. Support line rate 103.125 Gb/s ;

2. Channel bit rate 25.78 Gb/s 100GE ;

3. With LAN WDM EML laser and APD ;

4. Support multi-pin function, with IntL/RxLOS L and LPMode/TxDIS ;

5. 12C interface with integrated digital diagnostic monitoring ;

6. Complies with EU Directive 2015/863/EU .

4. QSFP28-100G-ZR4 Working Principle

Designed for ultra-long distance transmission, using 4-channel 28G NRZ wavelength division multiplexing technology (LWDM4) is a 4-channel full-duplex transceiver module. At the transmitting end, the four-channel serial data is recovered by the CDR and passed to the four laser drivers; at the receiving end, the optical signals of the four channels are amplified by the SOA, and then demultiplexed by the integrated optical demultiplexer.

A transmission distance of more than 80km is achieved through single-mode optical fiber. This model supports the OIF-100G-ZR standard and is suitable for long-distance connections in wide area networks and metropolitan area networks.

Advantages:

1. Supports line rates starting at 103.125 Gb/s ;

2. Channel bit rate 25.78 Gb/s 100GE ;

3. LAN WDM EML laser and PIN SOA receiver ;

4. Support multi-pin function, with IntL/RxLOS L and LPMode/TxDIS ;

5. 12C interface with integrated digital diagnostic monitoring ;

6. Complies with EU Directive 2015/863/EU .

Comparison chart of the technical parameters of four mainstream models of 100G QSFP28 dual-fiber optical modules :

These four mainstream models of 100G QSFP28 dual-fiber optical modules have their own characteristics and advantages, and play an important role in different application scenarios. When making an actual selection, it is necessary to comprehensively consider factors such as specific transmission distance, bandwidth requirements, and cost budget to select the most suitable optical module model to provide efficient and stable protection for data transmission.

About ETU-Link

ETU-Link Technology Co., Ltd. was founded in 2014. It is a high-tech enterprise focusing on the research and development, production and sales of optical communication devices. With high-speed optical modules as its core products, the company professionally serves the optical fiber communication markets such as telecommunications, data communications, and storage.