Optical access system for realizing high-speed optical signal transceiving by adopting six-order amplitude modulation and demodulation technology

Abstract

The invention discloses an optical access system for realizing high-speed optical signal receiving and transmitting by adopting a six-order amplitude modulation and demodulation technology, which is characterized in that data are input into a 6-PAM signal transmitting device at an optical line terminal to generate a baseband six-order pulse modulation (6-PAM) signal, and an optical wave generated by an external cavity laser is used as an optical carrier source; the generated baseband 6-PAM signal is loaded to a Mach-Zehnder modulator (MZM), so that a 6-PAM optical signal is generated; then long-distance single-mode optical fiber transmission is carried out; the transmitted 6-PAM optical signal enters the optical network unit, after the transmission loss is compensated by the erbium-doped optical fiber amplifier, the out-of-band noise is removed by the low-pass filter, the 6-PAM optical signal is converted into a 6-PAM electric signal by the photoelectric detector, and finally the 6-PAM electric signal enters the 6-PAM signal receiving device to restore the 6-PAM electric signal into a binary signal. The six-order amplitude modulation and demodulation high-speed optical signal access system provided by the invention provides high transmission rate and high bandwidth, and the system is low in cost and simple in structure and supports direct detection of optical signals.

Description

technical field [0001] The invention relates to the field of communication, in particular to an optical access system which adopts sixth-order pulse amplitude modulation (6-PAM) and demodulation technology to realize high-speed optical signal in optical access application. Background technique [0002] In recent years, in order to shorten the distance between different bandwidth communication services and different users, fiber-to-the-building, fiber-to-the-home, and fiber-to-desktop provide "last mile" solutions based on passive optical networks. However, the fast-growing Internet data flow in the future and the services of large-scale market users and commercial applications put forward higher capacity and higher efficiency requirements for optical access systems. At present, it has been found that the combination of advanced modulation format and intensity modulation direct detection technology can not only effectively obtain higher spectral efficiency and faster bit rate...

AI Technical Summary

Problems solved by technology

The larger the order is, the stronger the transmission capability of the PAM signal is, but the high-order PAM signal also has the disadvantages of dispersion tolerance and low receiver sensitivity. In practical applications, the 6-PAM signal has high transmission performance and relatively high performance. One of the best choices for low bit error rate (BER)

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