What does optical module fr1 mean

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This product is a transceiver module designed for 2km optical communication applications. First, let's clarify what VR, SR, DR, FR, LR, ER, and ZR stand for, so that we can understand and identify them: VR (Very Short Range): Transmission distance usually 0~100 meters, using multimode fiber for short data center connections. In this case, the "100GBASE" denotes an Ethernet connection at a speed of 100 gigabits per second (Gbps), while "FR" indicates that the specification is for. 100GBASE-FR1 supports long wavelength 4‑level pulse amplitude modulated (PAM4) serial transmission over duplex (2‑fiber) single-mode optical fiber cabling. 25 GBd per lane (PAM4 maps pairs of bits into a single symbol) and the supported distance.

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