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　　With the rapid development of the Internet and cloud computing industry, the

　　demand for 100G long distance products in the Data Center Interconnection (DCI)

　　and the Metropolitan Area Network (MAN) has also increased. According to the

　　third party forecast, the demand for 100G 40km optical modules will increase at

　　30% rate per year in the next five years.

　　For the 100G 40km optical interconnect applications, Gigalight can provide two

　　products to meet different needs.

　　One is the 100G CFP2 ER4 optical module applied to the Optical Transport

　　Network (OTN). It supports the OTU4 data rate and 40km transmission without

　　Forward Error Correction (FEC). It can simplify the MAN transmission network

　　with less relay equipment to reduce the system delay and operation maintenance

　　cost.

　　Another one is the 100G QSFP28 4WDM-40 optical module applied to the DCI

　　network. It is a convenient choice for long-distance interconnection applications

　　between 100G ports in the data centers.

　　Now, lets introduce the features of these two products.

　　Compared with the first-generation CFP optical module, the Gigalight 100G CFP2

　　ER4 has a smaller size reduced by 50% and lower power consumption reduced by

　　40%, which has improved the number of ports of the core devices and the

　　capability of data exchange. The 100G CFP2 ER4 optical module adopts the EML

　　laser (TOSA), PIN photodetector (ROSA), and Semiconductor Optical Amplifier

　　(SOA). Through the optimized control of these three core components, the

　　advantages of low power consumption are achieved. The typical power

　　consumption is only 8watt. At the same time, the Application-Specific Integrated

　　Circuit (ASIC) is used to implement the Management Data Input/Output (MDIO)

　　interface, which has strong compatibility.

　　The Gigalight 100G CFP2 ER4 optical module uses two advanced and efficient

　　algorithms developed by Gigalight-self.

　　The first one is the SOA gain control algorithm. In the case of receiving optical

　　power changing, the closed-loop adaptive algorithm can quickly lock the working

　　current and adjust the amplification performance of SOA, which can ensure the

　　normal operation of the receiver. Even if the system end does not open the FEC

　　function, the 100G CFP2 ER4 can support 40km transmission, which fully meets

　　the IEEE （） 802.3ba 100GBASE-ER4 standardand the strict ITU-T G.959.1

　　OTU4 (4L1-9C1F) standard.

　　The second one is the high-precision RX Digital Diagnostic Monitoring (DDM)

　　algorithm. The working current value of SOA and the voltage value detected by

　　the receiver (ROSA) have jointly constructed the RX DDM calculation model,

　　which realizes the high-precision monitoring of the receiver optical power. The

　　monitoring precision of RX DDM is controlled within 1dB, so that the monitoring

　　precision of the product is higher than the protocol requirement.

　　The Gigalight 100G QSFP28 4WDM 40 adopts the QSFP28 package, which has

　　the advantages of smaller size and lower power consumption, and meets the

　　100GE 4WDM-40 MSA specification. It uses a DML laser with dual-rate support

　　at the transmitter (TOSA), and compared with the 100G QSFP28 ER lite optical

　　module with EML laser, the DML version has the advantage of ultra-low power

　　consumption less than 3.8W（读 watt） at the full temperature range of 0 to 70

　　degrees, which meets the requirements of data center green energy saving. Its

　　receiver (ROSA) adopts a high-sensitive APD photodetector with a sensitivity of

　　less than -16.5dBm. It can support 40km transmission when the systems FEC

　　function is turned on, and can also support 30km zero error transmission when

　　the system disables the FEC function. The 100G QSFP28 4WDM-40optical

　　module provides an affordable solution for the optical interconnection between

　　distributed data centers.

　　For more information, please visit our official website (www.gigalight.com).