Optical transmission system, process and equipment of mixed modulated code
A technology of mixed modulation and mixed modulation signals, which is applied in the field of optical communication, can solve the problems of reduced sensitivity, poor anti-nonlinear performance, and too high extinction ratio, and achieve the effect of solving the limitation of extinction ratio and suppressing nonlinear effects
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Embodiment 1
[0034] see image 3 , this embodiment provides an optical transmission system with mixed modulation codes, including:
[0035] The differential phase shift keying signal loading module is used to load the DPSK load signal to a frequency of f m Generate a load clock signal on the clock signal, and output the load clock signal to the dual parallel modulator;
[0036] The frequency shift keying signal loading module is used to output the FSK label signal to the dual parallel modulator;
[0037] Dual parallel modulators are used to modulate the continuous light emitted by the laser using the load clock signal output by the differential phase shift keying signal loading module and the FSK label signal output by the frequency shift keying signal loading module to generate a mixed modulation of DPSK and FSK signal, and output a mixed modulation signal;
[0038] The demodulation module is used to demodulate the mixed modulation signal output by the dual parallel modulator, and reco...
Embodiment 2
[0072] see Figure 8 , the embodiment of the present invention provides an optical transmission method of a mixed modulation pattern, and the specific steps are as follows:
[0073] Step 101: The sinusoidal signal generator generates frequency f m The clock signal, through the splitter and phase shifter, generates four clock signals with equal amplitude and 90° phase difference between two adjacent signals, and the amplitude of the clock signal is not required.
[0074] For example: the clock signal loaded to electrode A1 of sub-Mach-Zehnder modulator A is cos(2πf m t), the clock signal of electrode A2 is cos(2πf m t+π), the clock signal loaded to the electrode B1 of the sub-Mach-Zehnder modulator B is sin(2πf m t), the clock signal of B2 electrode is sin(2πf m t+π). The DC bias circuit of the sub-Mach-Zehnder modulator A and B is provided by a bias circuit composed of a capacitor and a resistor, and the magnitude is equal to the conversion voltage V π , that is, sub-Mac...
Embodiment 3
[0090] see Figure 9 , a modulation and demodulation device, comprising:
[0091] The modulation module is used to load the differential phase shift keying payload signal onto the clock signal, generate the payload clock signal, use the frequency shift keying tag signal and the payload clock signal to modulate the continuous light, generate a mixed modulation signal, and output the mixed modulation Signal;
[0092] The demodulation module is used to perform optical splitting processing on the received mixed modulation signal, divide it into two channels, perform optical bandpass filtering on one signal, and then convert the filtered signal into an electrical signal to obtain an FSK label signal; Perform label erasure processing on the other signal, and perform interference superposition on the signal after erasing the label, then convert the signal after interference superposition into an electrical signal, and perform differential amplification processing to obtain the DPSK ...
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