Optical single-side band modulating device

Abstract

The invention relates to an optical single-side band modulating device in the technical field of optical communication, which comprises an optical splitter, a DDMZM (dual-drive Mach-Zehnder modulator), an MZM (Mach-Zehnder modulator), a coupling, a frequency-selecting amplifier and a strength phase control unit, wherein one branch end of the optical splitter is connected with the DDMZM, and the other branch end of the optical splitter is connected with the strength phase control unit; the DDMZM is connected with the frequency-selecting amplifier; the strength phase control unit is connected with the MZM; the frequency-selecting amplifier is connected with one branch end of the coupling, and the MZM is connected with the other branch end of the coupling; the strength phase control unit comprises an attenuator and an FDL (Fiber-optic Delay Line); and the frequency-selecting amplifier comprises an optical circulator, an IL-FPLD (Injection Locked-Fabry-Perot Laser Diode) and an optical filter. The invention can generate an optical single-side band signal with better side band and high-order harmonic inhibition, has the advantages of simple structure, easy integration and good dynamic configuration and stability and is suitable for a broadcasting scheme based on an SCM (Subcarrier Multiplexing) mode in an OSSB (Optical Single-side Band) transmission system and a WDM-PON (Wave Division Multiplexing-Passive Optical Network) and a high-speed and high-capacity transmission system based on a plurality of subcarrier modes.

Description

technical field [0001] The invention relates to a device in the technical field of optical communication, in particular to an optical single sideband modulation device. Background technique [0002] With the continuous emergence of various new services, people's demand for high-speed and large-capacity transmission is increasing. In order to make full use of spectral resources to achieve high-speed and large-capacity transmission, a subcarrier modulation scheme has been proposed. Subcarrier modulation refers to first modulating data onto a radio frequency carrier to generate a radio frequency signal, and then modulating the optical carrier with the radio frequency signal to generate a subcarrier modulation signal with sidebands. When the radio frequency signal modulates the optical carrier, an optical double-sideband signal with upper and lower sidebands will be generated. The data carried by the upper and lower sidebands of the optical double-sideband signal is the same. D...

AI Technical Summary

Problems solved by technology

[0004] 1) The high cost of unbalanced DPMZM directly increases the cost of the entire device;

[0005] 2) When the gap between the sidebands is small, the bandwidth of the optical bandpass filter is required to be small, so it is difficult to completely filter one of the sidebands through the filter, which will affect the optical single sideband signal generated. quality, and the cost is high; and when the optical carrier and the radio frequency carrier change and the sidebands move on the spectrum, the parameters of the filter need to be reconfigured, so an adjustable filter with dynamically configurable parameters is required. The cost is also relatively high;

[0006] 3) In this technology, data cannot be modulated on the optical carrier and sideband at the same time

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