With the continuous development of modern information technology, the demand for information transmission channel capacity by users is also rapidly increasing. Therefore, the market demand for 100G optical modules is constantly increasing, and their proportion in network construction costs is gradually increasing. The mainstream packaging of 100G optical modules mainly includes CFP, CFP2, CFP4, CFP8, QSFP28, and other forms. QSFP28 packaging has become the mainstream packaging form for 100G optical modules due to its advantages of smaller size and lower power consumption.

The QSFP28 optical module standards are mainly divided into SR4, BIDI SR, PSM4, LR4, ER4, ZR4, etc. In this blog, ETU-LINK will introduce you to the 100G QSFP28 BIDI SR optical module.

The 100G QSFP28 SR BIDI optical module has two independent full duplex optical channels, which comply with QSFP28 MSA and RoHS standards. The maximum power consumption is 4W, and the operating temperature is 0 to 70°C. When used with OM3 fiber patch cords, it can transmit up to 70 meters, and when used with OM4 fiber patch cords, it can transmit up to 100 meters.

Working principle

The 100G QSFP28 SR BIDI optical module utilizes PAM4 technology to enable each LC port to simultaneously transmit and receive optical signals of different wavelengths from a multimode fiber. Therefore, BIDI optical modules must be used in pairs to achieve bidirectional data transmission. The 100G QSFP28 SR BIDI optical module uses a single fiber to transmit and receive at a 50G rate, and two interfaces work together to achieve 100G transmission. It is suitable for short distance data communication and interconnection applications using multimode fiber (MMF). The working principle is as follows:

Product advantages and application

Because the network requirements have been upgraded from the original 10G or 25G to 100G, and the 10G or 25G network wiring is mainly based on LC duplex multimode fiber. If the conventional 100G QSFP28 SR4 optical module requires the use of MPO 8-core or 12-core multimode fiber, significant adjustments will be made on the basis of the original wiring, resulting in extremely high costs. The 100G BIDI SR optical module satisfies 100G transmission through two multimode fibers, which can effectively save on the cost of fiber infrastructure and is widely used in the fields of telecommunications and data centers.

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