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Introduction to 100G Optical Transceiver

With the accelerated development of industries such as the Internet, cloud computing and big data, 100G products are widely used, and the demand for long distances also increases.

For long-distance transmission application scenarios, the traditional solution needs to use DWDM equipment to increase the transmission distance. The networking is complex, additional equipment costs are required, and maintenance costs are high. The use of 100G optical transceivers can simplify the transmission network, reduce intermediate equipment, and reduce maintenance costs.

Ⅰ. What is a 100G optical transceiver?

Simply put, a 100G optical transceiver is an optical transceiver with a rate of 100G.

Ⅱ. Types of 100G optical transceivers

According to the different packaging methods, a 100G optical transceiver mainly includes three categories: CFP/CFP2/CFP4, CXP and QSFP28. Among them, CFP/CFP2/CFP4 and CXP are the packaging methods of early 100G optical transceivers.

QSFP28 is the packaging method of a new generation of 100G optical transceivers, and now 100g QSFP28 has become the mainstream package of 100G optical transceivers.

The principle of the 100G QSFP28 optical transceiver is similar to that of the QSFP+ optical transceiver, which transmits 100G optical signals in a 4×25 Gbps manner.

Ⅲ. Standard of 100G optical transceiver

Since the advent of the 100G network, IEEE, the Multi-Source Agreement (MSA) Industry Alliance and other institutions have developed multiple standards for 100G optical transceivers.

Among the many standards, the PSM4 and CWDM4 standards formulated by the Multi-Source Agreement (MSA) industry organization are more suitable for the mainstream 100g QSFP28 optical transceivers on the market today.

Ⅳ. Parameters of 100G optical transceiver

Optical transceivers have many important optoelectronic technical parameters, but we only need to understand a few of them;

1. Center wavelength: unit nanometer (nm);

2. Transmission rate: refers to the number of bits of data transmitted per second by the 100G optical transceiver, in bps;

3. Transmission distance: refers to the distance that the optical signal can be directly transmitted without repeater amplification, in kilometers (km);

There are other laser types, loss and dispersion, transmitting optical power and receiving sensitivity, fiber access network and operating temperature, etc., so that you can better choose the product that suits you.

Ⅴ. Advantages of 100G optical transceivers

1. The CFP optical transceiver supports full C-band wavelength adjustment and can complete link detection. The common optical duobinary modulation format ODB is selected, which is convenient for layout and power consumption is less than 24W.

2. The volume of CFP2 optical transceiver is ½ of that of CFP, and its integration is twice that of CFP. It can achieve stable reception sensitivity in a wide dynamic input range according to SOA, and supports comprehensive CFP optical transceivers, and its power consumption is less than 9W.

3. The volume of the CFP4 optical transceiver is ½ of that of the CFP2, its integration is twice that of the CFP2, and the port density on the front board is doubled compared to the CFP2.

CFP4 optical transceiver MSA protocol, supports the same rate as CFP2 and CFP2s, the transmission power is significantly improved, but the power consumption is greatly reduced, only about half of the original, and the price is lower than CFP2.

In addition, the CFP4 optical transceiver adopts the form of 4*25, and completes 100G transmission through four 25G channels, with higher transmission power and stronger stability.

4. The package style of QSFP28 optical transceiver is smaller than that of CFP4 optical transceiver. The power consumption of QSFP28 optical transceiver when working is generally not more than 3.5W. Using QSFP28 optical transceiver can directly upgrade from 25G to 100G without going through 40G, and the cost is lower.

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