The CFP8-LR8 module utilizes eight optical wavelengths through coarse wavelength division multiplexing (CWDM). Each wavelength carries 50 Gb/s PAM4 signal. This article breaks down the key differences between CFP, CFP2, CFP4, and CFP8 optical transceivers commonly used in fiber optic networks. The term “C form-factor pluggable” refers to the specific form factor and electrical interface of these modules, ensuring. The CFP, short for C form-factor pluggable, is a multi-source agreement to define the form-factor of the optical transceiver for high-speed digital signal transmission. CFP transceivers are defined by CFP MSA to enable 40 Gb/s, 100 Gb/s and 400 Gb/s applications. The essential techniques to implement 400GE, such as pulse amplitude modulation (PAM4), forward error correction (FEC) and a continuous time-domain linear equalizer (CTLE), are discussed.
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