Multi-wavelength light source apparatus and method for generating accurate wavelength interval and high flatness

Abstract

Disclosed is a device with precise channel spacing and multiple wavelength light source with high flatness and a method, belonging to the technical field of the optical communication, comprising an adjustable seed light source, a radio frequency signal source, a single arm mach tsend modulator, a double parallel mach tsend modulator, a power spliter, three electrical amplifiers and two electrical phase shifters. The method comprises: cascading the single arm mach tsend modulator and the double parallel mach tsend modulator, respectively driven by a low speed radio frequency signal, through selecting the bias points of the two modulators respectively as the highest point and the lowest point of the transmission curve, and simply control the amplitude and the phase of the radio frequency signal of the modulator, obtaining the wavelength light source including nine wavelengthes with the frequency interval equal to the frequency of the radio frequency signal. The wavelength light source of the invention has good spectral purity and phase coherence, high flatness, without expensive high power high frequency amplifier, thereby greatly reducing the arrangement cost.

Description

technical field [0001] The present invention relates to a device and method in the technical field of optical communication, in particular to a device and method for producing a multi-wavelength light source with precise wavelength interval and high flatness. Background technique [0002] Wavelength division multiplexing technology is an emerging optical communication technology, which refers to the simultaneous transmission of multiple optical signals of different wavelengths on one optical fiber. The optical communication system using wavelength division multiplexing technology has significant advantages: 1. It can make full use of the huge bandwidth resources of optical fibers and greatly increase the communication capacity of optical fiber lines; 2. It can save a lot of optical fibers and 3. It has nothing to do with the signal rate and electrical modulation method, and it is a convenient means to introduce new broadband services; 4. The use of wavelength division multip...

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Problems solved by technology

However, this solution has the following disadvantages: 1. The generated multi-wavelength light source has poor flatness of the channel, which will cause serious signal fading of the WDM transmission system; 2. The driving voltage amplitude of the modulated signal is very large, so high power high-speed electric amplifier, increasing the cost

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