CN114422036A - Adjustable all-optical signal format conversion assembly, device and conversion method - Google Patents
Adjustable all-optical signal format conversion assembly, device and conversion method Download PDFInfo
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Abstract
The invention discloses an adjustable all-optical signal format conversion component, a device and a conversion method, relating to the field of communication systems and solving the problems that the prior art adopts an optical-to-electrical conversion mode for 8QAM format conversion, increases signal transmission time delay and is not beneficial to high-speed large-capacity transmission of data flow, a nonlinear optical loop mirror is formed by utilizing a coupler, a high nonlinear optical fiber, a phase shifter and an attenuator, the amplitude state of an 8QAM signal is adjusted by utilizing the nonlinear optical loop mirror, the parameter of each component in the nonlinear optical loop mirror is set to obtain an 8PSK or rectangular 8QAM signal, and the processing of adjusting the amplitude state of the 8QAM signal is carried out in an optical domain, so that the network attack on an electrical layer can be effectively prevented, the processing of carrying out all-optical format conversion on signals with different modulation formats avoids the conversion mode of photoelectric light and optical signals transmission time delay, and the data traffic is easier to transmit in a high-speed large-capacity transmission line.
Description
Technical Field
The present invention relates to the field of communication systems, and more particularly, to an adjustable all-optical signal format conversion module, device, and conversion method.
Background
With the high-speed increase of data traffic in the network, the optical transmission network becomes a support network for high-speed data transmission. The all-optical information processing technology can reduce the processing time delay of network nodes and improve the transmission bandwidth. Meanwhile, the signal modulation formats for carrying data traffic are different due to different network types such as long-distance networks, short-distance networks and the like. Therefore, at a network node, it is of great significance to construct an all-optical format conversion node for an existing modulation format. The 8QAM signal is widely used in a high-speed large-capacity optical network as a high-order modulation signal, and different network types need to adopt signals of different modulation formats suitable for factors such as network capacity, receiving devices, transmission distance, and the like, so that the 8QAM needs to complete a format conversion function on the 8QAM at a network node for an optical network using 8QAM and 8PSK or a rectangular 8QAM modulation format.
The prior art has the following defects for generating 8PSK or rectangular 8QAM signals by converting 8QAM formats:
1. compared with 8PSK signals, 8QAM has different amplitude states, which is not beneficial to receiving by using a direct detection mode;
2. signals with different modulation formats are processed in an optical-to-electrical conversion mode, so that signal transmission delay is increased, and high-speed and high-capacity transmission of data flow is not facilitated;
3. when the electric domain processes the signal, there is a risk of stealing the secret by a network attack, which results in the reliability of the safe operation of the equipment being reduced.
Therefore, how to solve the above-mentioned drawbacks of the format conversion of 8QAM is a problem that needs to be solved. .
Disclosure of Invention
The invention aims to provide an adjustable all-optical signal format conversion component, an adjustable all-optical signal format conversion device and an adjustable all-optical signal format conversion method, so as to solve the problems that in the prior art, an 8PSK signal is generated by 8QAM format conversion or a rectangular 8QAM signal is subjected to optical-electrical conversion, the signal transmission delay is increased, and the high-speed and large-capacity transmission of data flow is not facilitated.
The technical purpose of the invention is realized by the following technical scheme:
in a first aspect, the present invention provides an adjustable all-optical signal format conversion component, including a signal modulation component and a nonlinear optical loop environment, where the nonlinear optical loop environment includes a first coupler, a high nonlinear optical fiber, an attenuator, a phase shifter and a second coupler, the signal modulation component is connected to the nonlinear optical loop environment, an output end of the first coupler is connected to the high nonlinear optical fiber and the phase shifter, the high nonlinear optical fiber is connected to the attenuator, and the phase shifter and the attenuator are connected to an input end of the second coupler;
the signal modulation component modulates the optical signal received by the all-optical format conversion component to obtain an 8QAM signal;
the first coupler carries out wave division processing on the 8QAM signals to obtain two paths of 8QAM signals;
the high nonlinear optical fiber is used for disturbing any one of the two paths of 8QAM signals, the attenuator is used for attenuating the disturbed signal, and the phase shifter is used for shifting the phase of any one of the two paths of 8QAM signals;
and the second coupler carries out wave combination processing on the two paths of 8QAM signals subjected to disturbance processing, attenuation processing and phase shift processing to obtain 8PSK signals or rectangular 8QAM signals.
Compared with the prior art, the invention firstly utilizes the signal modulation component to modulate the received optical signal to generate the 8QAM signal, and finally utilizes the coupler, the high nonlinear optical fiber, the phase shifter and the attenuator to form the nonlinear optical loop mirror, and utilizes the nonlinear optical loop mirror to adjust the amplitude state of the 8QAM signal to obtain the 8PSK or rectangular 8QAM signal.
Further, the signal modulation component includes a first phase modulator, a second phase modulator, an amplitude modulator, a third phase modulator, and an amplifier, where the first phase modulator, the second phase modulator, the amplitude modulator, the third phase modulator, and the amplifier are sequentially connected, the first phase modulator, the second phase modulator, the amplitude modulator, and the third phase modulator modulate the phase and the amplitude of the optical signal to obtain an 8QAM signal, and the amplifier adjusts the power of the 8QAM signal;
the all-optical format conversion component further comprises a signal-to-noise ratio module, and before the amplifier adjusts the power of the 8QAM signal, the signal-to-noise ratio module adds noise to the 8QAM signal to obtain the 8QAM signal with noise.
Further, the first phase modulator and the second phase modulator modulate the phase of the received optical signal to 180 ° and 90 °, the amplitude modulator modulates the amplitude index of the optical signal modulated by the first phase modulator to 0.75, the third phase modulator modulates the phase of the optical signal modulated by the amplitude modulator to 45 °, and the amplifier adjusts the power of the 8QAM signal to 20 dBm.
Further, when 8PSK signals are obtained, the nonlinear coefficient of the high nonlinear optical fiber is 13.1 (W-km)-1The length of the high nonlinear optical fiber is 440m, the attenuation coefficient of the high nonlinear optical fiber is 0.2dB/km, the attenuation of the attenuator is 0.9dB, and the phase deviation of the phase shifter is-45 degrees;
when rectangular 8QAM signals are obtained, the nonlinear coefficient of the high nonlinear optical fiber is 13.1 (W-km)-1The length of the high nonlinear optical fiber is 440m, the attenuation coefficient of the high nonlinear optical fiber is 0.2dB/km, the attenuation of the attenuator is 4dB, and the phase deviation of the phase shifter is-67 degrees.
In a second aspect, the present invention provides an apparatus comprising the above all-optical format conversion assembly.
Further, the device also comprises a laser connected with the first phase modulator, and the laser is used for generating an optical signal.
In a third aspect, the present invention provides a tunable all-optical signal format conversion method applied to the above apparatus, where the apparatus includes an all-optical format conversion component, the all-optical format conversion component includes at least a signal modulation component and a nonlinear optical loop environment, and the nonlinear optical loop environment includes a first coupler, a high nonlinear optical fiber, an attenuator, a phase shifter, and a second coupler, and the method includes:
modulating the optical signal received by the all-optical format conversion component through the signal modulation component to obtain an 8QAM signal;
performing wave division processing on the 8QAM signals after power adjustment through the first coupler to obtain two paths of 8QAM signals;
disturbing any one of the two paths of 8QAM signals through the high nonlinear optical fiber, attenuating the disturbed signal through the attenuator, and phase-shifting any one of the two paths of 8QAM signals through the phase shifter;
and carrying out wave combination processing on the two paths of 8QAM signals subjected to disturbance processing, attenuation processing and phase shift processing through the second coupler to obtain 8PSK signals or rectangular 8QAM signals.
Further, the signal modulation component comprises a first phase modulator, a second phase modulator, an amplitude modulator, a third phase modulator and an amplifier, the first phase modulator, the second phase modulator, the amplitude modulator, the third phase modulator and the amplifier are sequentially connected, the first phase modulator, the second phase modulator, the amplitude modulator and the third phase modulator modulate the phase and the amplitude of the optical signal to obtain an 8QAM signal, and the amplifier adjusts the power of the 8QAM signal;
the all-optical format conversion component further comprises a signal-to-noise ratio module, and before the power of the 8QAM signal is adjusted by the amplifier, noise is added to the 8QAM signal by the signal-to-noise ratio module, so that a noisy 8QAM signal is obtained.
Further, the phase of the received optical signal is modulated to 180 ° and 90 ° by the first phase modulator and the second phase modulator, respectively, the amplitude index of the optical signal modulated by the first phase modulator and the second phase modulator is modulated to 0.75 by the amplitude modulator, the phase of the optical signal modulated by the amplitude modulator is modulated to 45 ° by the third phase modulator, and the power of the 8QAM signal is adjusted to 20dBm by the amplifier.
Further, when 8PSK signals are obtained, the nonlinear coefficient of the high nonlinear optical fiber is 13.1 (W-km)-1The length of the high nonlinear optical fiber is 440m, the attenuation coefficient of the high nonlinear optical fiber is 0.2dB/km, the attenuation of the attenuator is 0.9dB, and the phase deviation of the phase shifter is-45 degrees;
when rectangular 8QAM signals are obtained, the nonlinear coefficient of the high nonlinear optical fiber is 13.1 (W-km)-1The length of the high nonlinear optical fiber is 440m, the attenuation coefficient of the high nonlinear optical fiber is 0.2dB/km, the attenuation of the attenuator is 4dB, and the phase deviation of the phase shifter is-67 degrees.
Compared with the prior art, the invention has the following beneficial effects:
1. the invention firstly utilizes the signal modulation component to modulate the received optical signal to generate an 8QAM signal, then utilizes the coupler, the high nonlinear optical fiber, the phase shifter and the attenuator to form a nonlinear optical loop mirror, utilizes the nonlinear optical loop mirror to adjust the amplitude state of the 8QAM signal to obtain the 8PSK or rectangular 8QAM signal, and because the adjustment processing of the amplitude state of the 8QAM signal is carried out in the optical domain, the network attack on an electric layer can be effectively prevented, the processing of the all-optical format conversion on the signals with different modulation formats avoids the conversion mode of photoelectric light, the signal transmission time delay is reduced, and the transmission of the data flow in a high-speed and large-capacity transmission line is easier.
2. The invention adjusts the state of the 8QAM signal in the nonlinear optical loop mirror, and the operation and maintenance personnel can check the optical power at the network node through the online network management, thereby realizing the online monitoring of the equipment operation and effectively improving the reliability of the equipment operation.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
fig. 1 is a schematic structural diagram of an all-optical format conversion module according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of an all-optical format conversion component after adding a signal-to-noise ratio module according to an embodiment of the present invention;
fig. 3 is a diagram of simulation results of all-optical format conversion of signals according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of an apparatus according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly or indirectly connected to the other element.
It will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, as used herein, refer to an orientation or positional relationship indicated in the drawings that is solely for the purpose of facilitating the description and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and is therefore not to be construed as limiting the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
Examples
As shown in fig. 1, an embodiment of the present application provides an adjustable all-optical signal format conversion module, which includes a signal modulation module 2 and a nonlinear optical loop environment, where the nonlinear optical loop environment includes a first coupler 31, a high nonlinear optical fiber 32, an attenuator 33, a phase shifter 34, and a second coupler 35, the signal modulation module 2 is connected to the nonlinear optical loop environment, an output end of the first coupler 31 is connected to the high nonlinear optical fiber 32 and the phase shifter 34, the high nonlinear optical fiber 32 is connected to the attenuator 33, and the phase shifter 34 and the attenuator 33 are connected to an input end of the second coupler 35;
the signal modulation component 2 modulates the optical signal received by the all-optical format conversion component to obtain an 8QAM signal;
the first coupler 31 performs wave division processing on the 8QAM signals to obtain two paths of 8QAM signals;
the high nonlinear optical fiber 32 is used for disturbing any one of the two paths of 8QAM signals, the attenuator 33 is used for attenuating the disturbed signal, and the phase shifter 34 is used for shifting the phase of any one of the two paths of 8QAM signals;
the second coupler 35 performs wave-combining processing on the two paths of 8QAM signals subjected to the disturbance processing, the attenuation processing, and the phase shift processing to obtain 8PSK signals or rectangular 8QAM signals.
The embodiment of the present application provides a schematic structural diagram of an adjustable all-optical signal format conversion component, where the all-optical format conversion component includes at least a signal modulation component 2 and a nonlinear optical loop environment, where the nonlinear optical loop environment includes a first coupler 31, a high nonlinear optical fiber 32, an attenuator 33, a phase shifter 34, and a second coupler 35, the signal modulation component 2 is connected to the nonlinear optical loop environment, an output end of the first coupler 31 is connected to the high nonlinear optical fiber 32 and the phase shifter 34, the high nonlinear optical fiber 32 is connected to the attenuator 33, and the phase shifter 34 and the attenuator 33 are connected to an input end of the second coupler 35.
The optical signal received by the all-optical format conversion component is a continuous optical wave output by the data transmission network, and the continuous optical wave is modulated by the signal modulation component 2 to generate an 8QAM signal.
The high nonlinear optical fiber 32 and the phase shifter 34 are connected through the first coupler 31, the high nonlinear optical fiber 32 is connected with the attenuator 33, the phase shifter 34 and the attenuator 33 are connected with the second coupler 35 to form the nonlinear optical loop mirror 3, which can be also called as an NLOM loop, the amplitude state, the phase and the signal attenuation of the 8QAM signal are adjusted through the nonlinear optical loop mirror 3 to generate an 8PSK or rectangular 8QAM signal, and finally the signal output by the second coupler 35 is received by a receiver.
In a further embodiment of the conversion component provided in this embodiment of the present application, the signal modulation component 2 includes a first phase modulator 21, a second phase modulator 22, an amplitude modulator 23, a third phase modulator 24, and an amplifier 25, where the first phase modulator 21, the second phase modulator 22, the amplitude modulator 23, the third phase modulator 24, and the amplifier 25 are sequentially connected, the first phase modulator 21, the second phase modulator 22, the amplitude modulator 23, and the third phase modulator 24 modulate the phase and the amplitude of the optical signal to obtain an 8QAM signal, and the amplifier 25 adjusts the power of the 8QAM signal;
the all-optical format conversion assembly further comprises a signal-to-noise ratio module 26, and before the amplifier 25 adjusts the power of the 8QAM signal, the signal-to-noise ratio module 26 adds noise to the 8QAM signal to obtain a noisy 8QAM signal.
Specifically, in this embodiment, as shown in fig. 2, a schematic structural diagram of an all-optical format conversion component provided in a further embodiment of the present application is shown, that is, a first phase modulator 21 adjusts a phase of a continuous light wave, an amplitude modulator 23 adjusts an amplitude of the continuous light wave adjusted by the first phase modulator 21, a second phase modulator 22 adjusts a second phase of a signal adjusted by the first phase modulator 21, the amplitude modulator 23 adjusts an amplitude of the signal adjusted by the second phase, and a third phase modulator 24 adjusts a phase of the signal adjusted by the amplitude modulator 23 to obtain an 8QAM signal, and an amplifier 25 adjusts an optical power of the 8QAM signal, where the amplifier 25 may be an erbium-doped optical fiber amplifier, a semiconductor optical amplifier, or an optical fiber raman amplifier, the application selects the erbium-doped optical fiber amplifier 25, the erbium-doped fiber amplifier 25 has superior performance and is widely applied to a long-distance, large-capacity and high-speed fiber communication system, because the all-optical format conversion component receives an optical signal, the 8QAM signal generated by the amplitude modulator 23 is noise-free, and for the communication system, increasing or improving the signal-to-noise ratio is a main technical index for improving the communication quality and reliability, therefore, the signal-to-noise ratio module 26 is connected between the amplitude modulator 23 and the amplifier 25 to add noise to the 8QAM signal, generate an 8QAM signal with the signal-to-noise ratio, and improve the communication quality and reliability of the signal in the fiber communication system.
In a further embodiment of the conversion module according to the present application, the first phase modulator 21 and the second phase modulator 22 respectively modulate the phase of the received optical signal to 180 ° and 90 °, the amplitude modulator 23 modulates the amplitude index of the optical signal modulated by the second phase modulator 22 to 0.75, the third phase modulator 24 modulates the phase of the optical signal modulated by the amplitude modulator 23 to 45 °, and the amplifier 25 adjusts the power of the 8QAM signal to 20 dBm.
Specifically, in this embodiment, as shown in fig. 3, a constellation diagram corresponding to a letter a in fig. 3 is a constellation diagram of an 8QAM signal, the first phase modulator 21 receives one continuous light wave emitted by the laser 1, an initial phase of the continuous light wave is default to 0, the continuous light wave passes through the first phase modulator, a second-order phase modulation signal with phase states of 0 and 180 ° is obtained after electro-optical modulation, and then the second phase modulator 22 electro-optically modulates the second-order phase modulation signal into a fourth-order phase modulation signal with four phase states. And then electro-optically modulating the four-order phase modulation signal by an amplitude modulator 23 to obtain an amplitude-phase jointly modulated 8-order signal, wherein the modulation index of the amplitude modulator 23 is 0.75, the inner layer and the outer layer of the signal have different amplitude states but the same phase state, and finally modulating the 8-order amplitude-phase jointly modulated signal into an inner layer and an outer layer of modulation signals with different phase states by electro-optically modulating by a third phase modulator 24 with the modulation index of 45 degrees, namely the 8QAM signal. The two layers, inner and outer, are obtained as shown in part a of fig. 3, each layer has four signals, the phase difference of each signal is 45 °, and the optical power of the 8QAM signal added with noise is adjusted by 20dBm through the amplifier 25.
In a further embodiment of the conversion module provided in the embodiments of the present application, the nonlinear coefficient of the highly nonlinear optical fiber 32 is 13.1(W km) when obtaining 8PSK signals-1The length of the high nonlinear optical fiber 32 is 440m, the attenuation coefficient of the high nonlinear optical fiber 32 is 0.2dB/km, the attenuation of the attenuator 33 is 0.9dB, and the phase deviation of the phase shifter 34 is-45 degrees;
when a rectangular 8QAM signal is obtained, the nonlinear coefficient of the highly nonlinear optical fiber 32 is 13.1(W km)-1The length of the highly nonlinear optical fiber 32 is 440m, the attenuation coefficient of the highly nonlinear optical fiber 32 is 0.2dB/km, the attenuation of the attenuator 33 is 4dB, and the phase shift of the phase shifter 34 is-67 deg.
Specifically, in this embodiment, since the 8PSK signal or the rectangular 8QAM signal converted from the 8QAM all-optical format is in two different modulation modes, parameters of devices in the nonlinear optical loop mirror 3 need to be set, and for the first coupler 31 and the second coupler 35 in the nonlinear optical loop mirror 3, an optical fiber coupler with a splitting ratio of 0.5 is used to implement the splitting processing and the combining processing of the 8QAM signal.
As shown in fig. 3, part b of fig. 3, by adjusting the amplitude state of the 8QAM signal of part a of fig. 3 for each component and parameter setting of each component in the nonlinear optical loop environment, 8PSK signals are generated, which have the same amplitude state between the signals, but the phase deviation amount is still kept at 45 °. In part c of fig. 3, the amplitude state of the 8QAM signal in part a of fig. 3 is adjusted by setting parameters of each component and each component in the nonlinear optical loop environment, so as to generate a rectangular 8QAM signal, and the phase state is kept unchanged compared with the input 8QAM signal, and it can be seen from part c of fig. 3 that connecting each signal in turn forms a rectangle, which is a rectangular 8QAM signal.
The invention firstly utilizes a phase modulator and an amplitude modulator 23 to adjust an optical signal to generate an 8QAM signal, then utilizes an amplifier 25 to adjust the optical power of the 8QAM signal, and finally utilizes a coupler, a high nonlinear optical fiber 32, a phase shifter 34 and an attenuator 33 to form a nonlinear optical loop mirror 3, utilizes the nonlinear optical loop mirror 3 to adjust the phase and the signal attenuation of the 8QAM signal to obtain the 8PSK or rectangular 8QAM signal, because the adjustment processing of the 8QAM signal is carried out in an optical domain, the network attack in an electrical layer can be effectively prevented, the processing of all-optical format conversion of signals with different modulation formats avoids the conversion mode of photoelectric light, the signal transmission time delay is reduced, the transmission of data flow in a high-speed large-capacity transmission line is easier, and the designed nonlinear optical loop mirror 3 is convenient for integrated installation, and the method is also compatible with the existing communication transmission equipment.
An embodiment of the present application further provides an apparatus, which includes the above all-optical format conversion component.
In a further embodiment of the apparatus provided in the present application, the apparatus further includes a laser 1, the laser 1 is connected to the first phase modulator 21, and the laser 1 is configured to generate an optical signal.
Specifically, since the all-optical format conversion component is only used for converting continuous light in the optical fiber transmission network into 8PSK signals or rectangular 8QAM signals, and does not have the function of receiving the continuous light, a laser 1 is connected to the apparatus, as shown in fig. 4, that is, the apparatus is composed of the laser 1, the signal modulation component 2, the nonlinear optical loop mirror 3, and a receiver, the laser 1 is used for emitting the continuous light waves, the continuous light waves obtain the 8QAM signals through the signal modulation component 2, format conversion is completed on the 8QAM signals after power adjustment by the amplifier through the nonlinear optical environment 3, 8PSK signals or rectangular 8QAM signals are generated, and finally, the signal constellation diagram is obtained through receiving and demodulating by the receiver.
The device of the embodiment of the application comprises the signal all-optical format conversion component, and the phase and the signal attenuation of the 8QAM signal are adjusted through the nonlinear optical loop mirror to obtain the 8PSK or rectangular 8QAM signal. The operation of adjusting the amplitude state of the 8QAM signal through the nonlinear optical loop mirror is performed in an optical domain, network attack on an electrical layer is effectively prevented, the conversion mode of all-optical conversion is adopted to process signals with different modulation formats, the format conversion mode of optical-electrical-optical is also avoided, the signal transmission time delay is reduced, high-speed and high-capacity transmission of data flow is easier, the designed nonlinear optical loop mirror is convenient to integrate and install, and the nonlinear optical loop mirror is compatible with the existing communication transmission equipment.
An embodiment of the present application further provides an adjustable all-optical signal format conversion method, which is applied to the above apparatus, where the apparatus includes an all-optical format conversion component, the all-optical format conversion component includes at least a signal modulation component and a nonlinear optical loop environment, the nonlinear optical loop environment includes a first coupler, a high nonlinear optical fiber, an attenuator, a phase shifter, and a second coupler, and the method includes:
modulating the optical signal received by the all-optical format conversion component through the signal modulation component to obtain an 8QAM signal;
performing wave division processing on the 8QAM signals after power adjustment through a first coupler to obtain two paths of 8QAM signals;
disturbing any one of the two paths of 8QAM signals through a high nonlinear optical fiber, attenuating the disturbed signal through an attenuator, and phase-shifting any one of the two paths of 8QAM signals through a phase shifter;
and carrying out wave combination processing on the two paths of 8QAM signals subjected to the disturbance processing, the attenuation processing and the phase shift processing through a second coupler to obtain 8PSK signals or rectangular 8QAM signals.
Specifically, the all-optical format conversion method for the 8QAM signal according to the embodiment of the present application is applied to the above apparatus, and the apparatus includes an all-optical format conversion component, where the all-optical format conversion component at least includes a signal modulation component and a nonlinear optical loop environment, and the nonlinear optical loop environment includes a first coupler, a high nonlinear optical fiber, an attenuator, a phase shifter, and a second coupler.
Modulating continuous light waves received by the device through a signal modulation component to generate 8QAM signals to obtain 8QAM signals, and performing wave division processing on the 8QAM signals after power adjustment through a first coupler to obtain two paths of 8QAM signals; disturbing any one of the two paths of 8QAM signals through a high nonlinear optical fiber, and attenuating the disturbed signal through an attenuator; performing phase shift processing on any one path of signals of the two paths of 8QAM signals through a phase shifter; and carrying out wave combination processing on the two paths of 8QAM signals subjected to the disturbance processing, the attenuation processing and the phase shift processing through a second coupler to obtain 8PSK signals or rectangular 8QAM signals. The nonlinear optical loop mirror is formed by a coupler, a high nonlinear optical fiber, a phase shifter and an attenuator, the nonlinear optical loop mirror is utilized to adjust the phase and the signal attenuation of an 8QAM signal to obtain an 8PSK or rectangular 8QAM signal, the adjustment processing of the 8QAM signal is carried out in an optical domain, so that the network attack on an electrical layer can be effectively prevented, the processing of all-optical format conversion on signals with different modulation formats avoids the conversion mode of photoelectric light and light, the signal transmission delay is reduced, the transmission of data flow on a high-speed large-capacity transmission line is easier, the adjustment of the 8QAM signal is carried out in the nonlinear optical loop mirror, operation and maintenance personnel can check the optical power at a network node through an online network manager, the online monitoring of the operation of equipment is realized, and the reliability of the operation of the equipment can be effectively improved.
In a further implementation of the conversion method provided by the embodiment of the application, the signal modulation component includes a first phase modulator, a second phase modulator, an amplitude modulator, a third phase modulator and an amplifier, the first phase modulator, the second phase modulator, the amplitude modulator, the third phase modulator and the amplifier are sequentially connected, the first phase modulator, the second phase modulator, the amplitude modulator and the third phase modulator modulate the phase and the amplitude of the optical signal to obtain an 8QAM signal, and the amplifier adjusts the power of the 8QAM signal;
the all-optical format conversion assembly further comprises a signal-to-noise ratio module, and noise is added to the 8QAM signal through the signal-to-noise ratio module before the power of the 8QAM signal is adjusted through the amplifier, so that a noisy 8QAM signal is obtained.
Specifically, the phase of the continuous light wave is adjusted by the first phase modulator, then the amplitude of the continuous light wave adjusted by the first phase modulator is adjusted by the amplitude modulator, then the secondary phase adjustment is performed on the signal adjusted by the first phase modulator by the second phase modulator, then the amplitude of the signal adjusted by the secondary phase adjustment is adjusted by the amplitude modulator, finally the phase of the signal adjusted by the amplitude modulator is adjusted by the third phase modulator to obtain an 8QAM signal, then the optical power of the 8QAM signal is adjusted by the amplifier, the amplifier can be an erbium-doped optical fiber amplifier, a semiconductor optical amplifier or an optical fiber raman amplifier, the application selects the erbium-doped optical fiber amplifier, the excellent performance of the erbium-doped optical fiber amplifier is widely applied to the optical fiber communication system with long distance, large capacity and high speed, because the all-optical format conversion component receives an optical signal, therefore, the 8QAM signal generated by the amplitude modulator has no noise, and for the communication system, increasing or improving the signal-to-noise ratio is a main technical index for improving the communication quality and reliability, so the signal-to-noise ratio module is connected between the amplitude modulator and the amplifier to add noise to the 8QAM signal, generate an 8QAM signal with the signal-to-noise ratio, and improve the communication quality and reliability of the signal in the optical fiber communication system.
In a further implementation of the conversion method provided in this embodiment, the phase of the received optical signal is modulated to 180 ° and 90 ° by the first phase modulator and the second phase modulator, the amplitude index of the optical signal modulated by the first phase modulator is modulated to 0.75 by the amplitude modulator, the phase of the optical signal modulated by the amplitude modulator is modulated to 45 ° by the third phase modulator, and the power of the 8QAM signal is adjusted to 20dBm by the amplifier.
Specifically, the first phase modulator receives a beam of continuous light waves emitted by the laser, the initial phase of the continuous light waves is defaulted to 0, the continuous light waves pass through the first phase modulator, second-order phase modulation signals with phase states of 0 and 180 degrees are obtained after electro-optical modulation, and then the second phase modulator electro-optically modulates the second-order phase modulation signals into fourth-order phase modulation signals with four phase states. And then electro-optically modulating the four-order phase modulation signal by an amplitude modulator to obtain an amplitude-phase jointly modulated 8-order signal, wherein the modulation index of the amplitude modulator is 0.75, the inner layer and the outer layer of the signal have different amplitude states but the same phase state, and finally modulating the 8-order amplitude-phase jointly modulated signal into an inner layer and an outer layer of modulation signals with different phase states by the phase modulator with the modulation index of 45 degrees through electro-optical modulation, namely the 8QAM signal. The inner and outer layers as shown in part a of fig. 3 can be obtained, each layer has four signals, the phase difference of each signal is 45 degrees, and then the optical power of the 8QAM signal added with noise is adjusted by 20dBm through an amplifier.
In a further implementation of the conversion method provided in the embodiments of the present application, the nonlinear coefficient of the highly nonlinear optical fiber is 13.1(W km) when obtaining 8PSK signals-1The length of the high nonlinear optical fiber is 440m, the attenuation coefficient of the high nonlinear optical fiber is 0.2dB/km, the attenuation of the attenuator is 0.9dB, and the phase deviation of the phase shifter is-45 degrees;
when rectangular 8QAM signals are obtained, the nonlinear coefficient of the highly nonlinear optical fiber is 13.1(W km)-1The length of the high nonlinear optical fiber is 440m, the attenuation coefficient of the high nonlinear optical fiber is 0.2dB/km, the attenuation of the attenuator is 4dB, and the phase deviation of the phase shifter is-67 degrees.
Specifically, 8PSK signals or rectangular 8QAM signals converted from an 8QAM all-optical format need to be set for parameters of devices in the nonlinear optical loop mirror, and for the first coupling and the second coupling in the nonlinear optical loop mirror, an optical fiber coupler with a splitting ratio of 0.5 is used to implement the splitting processing and the combining processing of the 8QAM signals.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. An adjustable all-optical signal format conversion component, comprising a signal modulation component and a nonlinear optical loop environment, wherein the nonlinear optical loop environment comprises a first coupler, a high nonlinear optical fiber, an attenuator, a phase shifter and a second coupler, the signal modulation component is connected with the nonlinear optical loop environment, an output end of the first coupler is connected with the high nonlinear optical fiber and the phase shifter, the high nonlinear optical fiber is connected with the attenuator, and the phase shifter and the attenuator are connected with an input end of the second coupler;
the signal modulation component modulates the optical signal received by the all-optical format conversion component to obtain an 8QAM signal;
the first coupler carries out wave division processing on the 8QAM signals to obtain two paths of 8QAM signals;
the high nonlinear optical fiber is used for disturbing any one of the two paths of 8QAM signals, the attenuator is used for attenuating the disturbed signal, and the phase shifter is used for shifting the phase of any one of the two paths of 8QAM signals;
and the second coupler carries out wave combination processing on the two paths of 8QAM signals subjected to disturbance processing, attenuation processing and phase shift processing to obtain 8PSK signals or rectangular 8QAM signals.
2. The tunable all-optical signal format conversion assembly according to claim 1, wherein the signal modulation assembly comprises a first phase modulator, a second phase modulator, an amplitude modulator, a third phase modulator and an amplifier, the first phase modulator, the second phase modulator, the amplitude modulator, the third phase modulator and the amplifier are connected in sequence, the first phase modulator, the second phase modulator, the amplitude modulator and the third phase modulator modulate the phase and amplitude of the optical signal to obtain an 8QAM signal, and the amplifier adjusts the power of the 8QAM signal;
the all-optical format conversion component further comprises a signal-to-noise ratio module, and before the amplifier adjusts the power of the 8QAM signal, the signal-to-noise ratio module adds noise to the 8QAM signal to obtain the 8QAM signal with noise.
3. The tunable all-optical signal format conversion module according to claim 2, wherein the first phase modulator and the second phase modulator modulate the phase of the received optical signal to 180 ° and 90 °, respectively, the amplitude modulator modulates the amplitude index of the optical signal modulated by the second phase modulator to 0.75, the third phase modulator modulates the phase of the optical signal modulated by the amplitude modulator to 45 °, and the amplifier adjusts the power of the 8QAM signal to 20 dBm.
4. The tunable all-optical signal format conversion package of claim 1, wherein the nonlinear coefficient of the highly nonlinear optical fiber is 13.1 (W-km) when obtaining 8PSK signals-1The length of the high nonlinear optical fiber is 440m, the attenuation coefficient of the high nonlinear optical fiber is 0.2dB/km, the attenuation of the attenuator is 0.9dB, and the phase deviation of the phase shifter is-45 degrees;
when rectangular 8QAM signals are obtained, the nonlinear coefficient of the high nonlinear optical fiber is 13.1 (W-km)-1The length of the high nonlinear optical fiber is 440m, and the optical fiberThe attenuation coefficient of the high nonlinear optical fiber is 0.2dB/km, the attenuation of the attenuator is 4dB, and the phase deviation of the phase shifter is-67 degrees.
5. An apparatus comprising an all-optical format conversion assembly according to any one of claims 1 to 4.
6. An apparatus according to claim 5, further comprising a laser coupled to the first phase modulator, the laser being configured to generate the optical signal.
7. A tunable all-optical signal format conversion method applied to the apparatus according to any one of claims 4 to 5, the apparatus comprising an all-optical format conversion component including at least a signal modulation component and a nonlinear optical loop environment including a first coupler, a high nonlinear optical fiber, an attenuator, a phase shifter, and a second coupler, the method comprising:
modulating the optical signal received by the all-optical format conversion component through the signal modulation component to obtain an 8QAM signal;
performing wave division processing on the 8QAM signals after power adjustment through the first coupler to obtain two paths of 8QAM signals;
disturbing any one of the two paths of 8QAM signals through the high nonlinear optical fiber, attenuating the disturbed signal through the attenuator, and phase-shifting any one of the two paths of 8QAM signals through the phase shifter;
and carrying out wave combination processing on the two paths of 8QAM signals subjected to disturbance processing, attenuation processing and phase shift processing through the second coupler to obtain 8PSK signals or rectangular 8QAM signals.
8. The method according to claim 7, wherein the signal modulation component comprises a first phase modulator, a second phase modulator, an amplitude modulator, a third phase modulator and an amplifier, the first phase modulator, the second phase modulator, the amplitude modulator, the third phase modulator and the amplifier are connected in sequence, the first phase modulator, the second phase modulator, the amplitude modulator and the third phase modulator modulate the phase and amplitude of the optical signal to obtain an 8QAM signal, and the amplifier adjusts the power of the 8QAM signal;
the all-optical format conversion component further comprises a signal-to-noise ratio module, and before the power of the 8QAM signal is adjusted by the amplifier, noise is added to the 8QAM signal by the signal-to-noise ratio module, so that a noisy 8QAM signal is obtained.
9. The method according to claim 7, wherein the phase of the received optical signal is modulated to 180 ° and 90 ° by the first phase modulator and the second phase modulator, respectively, the amplitude index of the optical signal modulated by the first phase modulator is modulated to 0.75 by the amplitude modulator, the phase of the optical signal modulated by the amplitude modulator is modulated to 45 ° by the third phase modulator, and the power of the 8QAM signal is adjusted to 20dBm by the amplifier.
10. The method according to claim 7, wherein the nonlinear coefficient of said highly nonlinear optical fiber is 13.1 (W-km) when 8PSK signal is obtained-1The length of the high nonlinear optical fiber is 440m, the attenuation coefficient of the high nonlinear optical fiber is 0.2dB/km, the attenuation of the attenuator is 0.9dB, and the phase deviation of the phase shifter is-45 degrees;
when rectangular 8QAM signals are obtained, the nonlinear coefficient of the high nonlinear optical fiber is 13.1 (W-km)-1The length of the high nonlinear optical fiber is 440m, the attenuation coefficient of the high nonlinear optical fiber is 0.2dB/km, the attenuation of the attenuator is 4dB, and the phase of the phase shifterThe amount of bit offset was-67 °.
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| WO2008026326A1 (en) * | 2006-08-30 | 2008-03-06 | Hitachi Communication Technologies, Ltd. | Optical modulator |
| CN101188460A (en) * | 2007-12-13 | 2008-05-28 | 上海交通大学 | Full optical network networking system for passive light network and MAN |
| US20180062754A1 (en) * | 2016-08-26 | 2018-03-01 | International Business Machines Corporation | Electro-optic phase modulator with no residual amplitude modulation |
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| WO2008026326A1 (en) * | 2006-08-30 | 2008-03-06 | Hitachi Communication Technologies, Ltd. | Optical modulator |
| CN101188460A (en) * | 2007-12-13 | 2008-05-28 | 上海交通大学 | Full optical network networking system for passive light network and MAN |
| US20180062754A1 (en) * | 2016-08-26 | 2018-03-01 | International Business Machines Corporation | Electro-optic phase modulator with no residual amplitude modulation |
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