AOC (Active Optical Cable)

The full name of lwdm is Lan WDM, which usually refers to a wavelength range dense WDM technology in 100g optical modules. According to the wavelength defined by IEEE 802.3, the wavelength of LAN WDM mainly covers 10km.

The wavelength is 1295.56nm, 1300.05nm, 1304.58nm, 1309.14nm.

Pam4 is a kind of PAM (pulse-amplitude modulation) modulation technology, namely fourth-order pulse amplitude modulation.

PAM signal is a popular signal transmission technology after NRZ (nonreturn to zero).

NRZ signal uses high and low signal levels to represent 1 and 0 of digital logic signal. Each clock cycle can transmit 1 bit of logic information.

Pam4 signal is transmitted by four different signal levels, and each clock cycle can transmit 2-bit logic information, namely 00, 01, 10, 11.

Therefore, under the same baud rate, the bit rate of pam4 signal is twice that of NRZ signal, the transmission efficiency is doubled, and the cost can be effectively reduced.

SFP, small hot pluggable module. Finger sized transceivers are suitable for many different rates and protocols, including multimode fiber, single-mode fiber, copper wire, and multi-wavelength interfaces for WDM systems. In a pluggable transponder, a pluggable network card is used to transmit a specific wavelength of WDM.