Method and device for generating and receiving optical OFDM-MSK signals

Abstract

The invention belongs to the technical field of optical communication networks, and particularly relates to a device for generating and receiving optical OFDM-MSK signals. The device comprises a transmitting device and a receiving device, wherein the transmitting device comprises a continuous wave laser, a data signal source, an MSK encoder, a signal demultiplexing mapping device, a signal inverse Fourier transformer, a parallel-to-serial conversion device, a digital-analog conversion device and a single-electrode electro-optical modulator; and the receiving device comprises the main components of a photoelectric detection diode, a digital-analog conversion device, a parallel-to-serial conversion device, a signal Fourier transformer, signal de-mapping multiplexing device, an MSK decoder, a data receiver and the like. The device is simple in structure, stable in performance and low in price. The device can be used for improving the performance of optical OFDM signals in a direct modulation-detection optical OFDM communication system and a coherence modulation-detection optical OFDM communication system, and simplifying the processing of demodulation signals in a receiving machine.

Description

technical field [0001] The invention belongs to the technical field of optical communication networks, and in particular relates to a device for generating and receiving optical OFDM-MSK signals, which can be used to improve the performance of optical OFDM signals in direct modulation-detection optical OFDM communication systems and coherent modulation-detection optical OFDM communication systems and simplify the processing of the demodulated signal in the receiver. Background technique [0002] Recent studies have shown that Orthogonal Frequency Division Multiplexing (OFDM) signals can also be used in long-distance optical fiber communication systems [Jean Armstrong., OFDM for Optical Communications. JOURNAL OF LIGHTWAVE TECHNOLOGY, VOL.27, NO.3, FEBRUARY1, 2009, 189-204], it is considered that OFDM combined with modulation technology can resist the influence of fiber dispersion and polarization mode dispersion, especially it can be used to compensate the dispersion in WDM ...

AI Technical Summary

Problems solved by technology

[0003] However, the fiber optic OFDM systems that have been reported at home and abroad are only limited to the combination of phase shift keying (PSK) modulation technology or quadrature amplitude (QAM) modulation technology, and do not involve the combination of minimum frequency shift keying (MSK) modulation technology

When using PSK modulation or QAM modulation in the existing optical fiber OFDM system, there will be a 180-degree phase modulation offset between each signal point, especially when combined with multi-ary PSK modulation or QAM modulation, there will be a phase modulation offset inconsistent, thus complicating the digital signal processing in the receiver to achieve phase demodulation

Images