CN102571682B - Method and device for producing quadrature amplitude modulation signal light - Google Patents
Method and device for producing quadrature amplitude modulation signal light Download PDFInfo
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- CN102571682B CN102571682B CN201110424844.5A CN201110424844A CN102571682B CN 102571682 B CN102571682 B CN 102571682B CN 201110424844 A CN201110424844 A CN 201110424844A CN 102571682 B CN102571682 B CN 102571682B
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Abstract
The invention belongs to the optical communication technology, and discloses a method and a device for producing a quadrature amplitude modulation signal light. The method comprises the following steps of: regulating a polarization state of an input signal light so as to project the signal light into two polarized and orthogonal signal lights on a fast axis and a slow axis of a tunable differential group time delay unit; introducing a group time delay difference between the two polarized and orthogonal signal lights; then, projecting the two polarized and orthogonal signal lights along a light-transmitting direction on a polarization analyzer after executing polarization control; and obtaining the corresponding quadrature amplitude modulation signal light by performing the related vector addition on the two projected signal lights in the light-transmitting direction, wherein the two projected signal lights are in the same polarization direction. The device comprises a first polarization controller, a first tunable differential group time delay unit, a second polarization controller and a first polarization analyzer, which are orderly connected. When the QPSK signal light is input, the 16-QAM signal light is output; and when the 16-QAM signal light is input, the 256-QAM signal light is output. The method and the device are simple and easy to implement, and the components used are all passive devices, can work under high speed condition and simultaneously have excellent expandability.
Description
Technical field
The invention belongs to optical communication technique, relate to the generation of advanced advanced modulation formats flashlight, be specifically related to production method and the device of a kind of quadrature amplitude modulation (16-QAM and 256-QAM) flashlight.
Background technology
In recent years, the appearance of advanced advanced modulation formats has effectively promoted the fast development of high-speed high capacity optical communication net, and advanced advanced modulation formats has become the important trend of optical communication development in conjunction with relevant detection.Than traditional binary modulation format (1 bits/sym) as on-off keying (OOK), differential phase keying (DPSK) (DPSK), advanced advanced modulation formats adopts multi-system, in a code element, comprise multiple bit informations, therefore can effectively improve information rate, message capacity and spectrum efficiency.Typical advanced advanced modulation formats comprises 4 phase phase shift keyings (QPSK) (2 bits/sym), octaphase-shift keying (8PSK) (3 bits/sym), 16 phase phase shift keyings (16PSK) (4 bits/sym) and quadrature amplitude modulation (QAM) etc., wherein quadrature amplitude modulation comprises again multiple, as 16 quadrature amplitude modulation (16-QAM) (4 bits/sym), 32 quadrature amplitude modulation (64-QAM) (5 bits/sym), 64 quadrature amplitude modulation (64-QAM) (6 bits/sym), 128 quadrature amplitude modulation (128-QAM) (7 bits/sym), 256 quadrature amplitude modulation (256-QAM) (8 bits/sym) etc.Quadrature amplitude modulation, owing to being multistage amplitude and phase-modulation, contains multiple bit informations a code element, in high-speed high capacity fiber optic transmission system, is applied widely at present.
Tradition is inphase/orthogonal modulator (I/Q modulator) or single I/Q modulator and the multistage signal of telecommunication that uses cascade for generation of the method and apparatus of QAM, although widely apply but implement comparatively complicated, it is larger that more multistage QAM implements difficulty, and the QAM performance degradation producing is more serious.Meanwhile, chip rate is relatively limited, is difficult to produce multistage QAM at a high speed.If can find a kind of method and apparatus that produces emulation QAM, its have speed not limited and be simple and easy to realize feature, will there is important value for carrying out the application study of QAM in high-speed high capacity optical communication system in a deep going way.
Summary of the invention
The object of this invention is to provide a kind of production method and device of the quadrature amplitude modulation signal light that is applied to high speed optical communication system; The present invention utilizes tunable differential group delay device, QPSK or the 16-QAM flashlight of input is processed, by required 16-QAM or the 256-QAM flashlight of the corresponding generation of relevant vector addition; Apparatus of the present invention are simple and easy to realize, and device used is passive device, can be operated in (without operating rate restriction) under high-speed case, are with good expansibility simultaneously.
The production method of a kind of quadrature amplitude modulation signal light provided by the invention produces 16-QAM flashlight in the time being input as QPSK flashlight, produces 256-QAM flashlight in the time being input as 16-QAM flashlight, and its production process is:
Regulate the polarization state of input signal light, make to be projected as two flashlights that polarization state is orthogonal on its fast axle at tunable differential group delay device and slow axis, during through tunable differential group delay device, between the flashlight of these two polarized orthogonals, introduce the group delay time difference, group delay extent is a positive integer flashlight code-element period and the half that is less than flashlight code element total length, then, the flashlight of two polarized orthogonals is carrying out projection after Polarization Control on arbitrary optical direction, two identical flashlights of polarization direction of the corresponding gained of projection obtain corresponding quadrature amplitude modulation signal light through relevant vector addition on described optical direction.Carry out polarization regulation and control by the front and back at tunable differential group delay device, in the time being input as QPSK flashlight, on described optical direction, identical its light field amplitude of two QPSK flashlights in the polarization direction of projection gained differs 3dB, and both produce 16-QAM flashlight through relevant vector addition on described optical direction; In the time being input as 16-QAM flashlight, on described optical direction, identical its light field amplitude of two 16-QAM flashlights in the polarization direction of projection gained differs 6dB, and both produce 256-QAM flashlight through relevant vector addition on described optical direction.
As the improvement of technique scheme, in the time being input as QPSK flashlight, using the 16-QAM flashlight of output as new input signal light, repeating described production process and further export 256-QAM flashlight.
The generation device of a kind of quadrature amplitude modulation signal light provided by the invention, is characterized in that: this device comprises the first Polarization Controller, the first tunable differential group delay device, the second Polarization Controller and the first analyzer; The input port of the first Polarization Controller, be used for receiving QPSK or 16-QAM flashlight, the output port of the first Polarization Controller is connected with the input port of the first analyzer with the second Polarization Controller by the first tunable differential group delay device successively, and the output port of the first analyzer is for corresponding output 16-QAM or 256-QAM flashlight.The group delay time difference of introducing between the first fast axle of tunable differential group delay device and slow axis is a positive integer flashlight code-element period and the half that is less than flashlight code element total length.In the time that the input port of the first Polarization Controller receives QPSK flashlight, differ 3dB by identical its light field amplitude of two QPSK flashlights in polarization direction that the first Polarization Controller and the adjusting of the second Polarization Controller is made to the fast axle QPSK of the first tunable differential group delay device flashlight and slow axis QPSK flashlight projection gained on the first analyzer optical direction, both export 16-QAM flashlight through relevant vector addition at the output port of the first analyzer; In the time that the input port of the first Polarization Controller receives 16-QAM flashlight, differ 6dB by identical its light field amplitude of two 16-QAM flashlights in polarization direction that the first Polarization Controller and the adjusting of the second Polarization Controller is made to the fast axle 16-QAM of the first tunable differential group delay device flashlight and slow axis 16-QAM flashlight projection gained on the first analyzer optical direction, both export 256-QAM flashlight through relevant vector addition at the output port of the first analyzer.
As the improvement of said apparatus, the first Polarization Controller is used for receiving QPSK flashlight, and this device also comprises the 3rd Polarization Controller, the second tunable differential group delay device, the 4th Polarization Controller and the second analyzer; The input port of the 3rd Polarization Controller is connected with the output port of the first analyzer; The output port of the 3rd Polarization Controller is connected with the input port of the second analyzer by the second tunable differential group delay device, the 4th Polarization Controller successively, and the output port of the second analyzer is used for exporting 256-QAM flashlight.The group delay time difference of introducing between the second fast axle of tunable differential group delay device and slow axis is a positive integer flashlight code-element period and the half that is less than flashlight code element total length.Differ 6dB by identical its light field amplitude of two 16-QAM flashlights in polarization direction that the 3rd Polarization Controller and the adjusting of the 4th Polarization Controller is made to the fast axle 16-QAM of the second tunable differential group delay device flashlight and slow axis 16-QAM flashlight projection gained on the second analyzer optical direction.
The present invention has following beneficial effect:
1, than the generation scheme of traditional Q AM flashlight, the present invention adopts differential group delay device to produce QAM flashlight, and this provides a kind of new ideasand methods and device for producing QAM flashlight, and scheme is simple and easy to realize, easy and simple to handle.
2, the production method of QAM flashlight of the present invention and device, employing are all passive devices, therefore unrestricted in speed, be applicable to the generation of High Speed QAM flashlight, such as even higher rate of 40Gbaud/s, 100Gbaud/s.
3, the production method of QAM flashlight of the present invention and device, except not being subject to rate limit, because passive device can not introduced the impact of additional noise, therefore can produce the high-quality QAM flashlight of low noise.
4, the production method of QAM flashlight of the present invention and device, by changing the group delay extent of tunable differential group delay device, can be applied to the generation (as 10Gbaud/s, 40Gbaud/s, 100Gbaud/s etc.) of different rates QAM flashlight, not only can be for generation of 16-QAM flashlight by adjusting Polarization Controller, can also produce 256-QAM flashlight, therefore there is the reconfigurability of operating rate and practical function.
Brief description of the drawings
Fig. 1 is the theory structure schematic diagram of quadrature amplitude modulation signal light production method of the present invention and device;
Fig. 2 is the principle schematic that 16-QAM flashlight of the present invention produces;
Fig. 3 is the theory structure schematic diagram of 16-QAM flashlight production method of the present invention and device;
Fig. 4 is the principle schematic that 256-QAM flashlight of the present invention produces;
Fig. 5 is the theory structure schematic diagram of 256-QAM flashlight production method of the present invention and device.
Fig. 6 is the planisphere of the 10-Gbaud/s 16-QAM flashlight that produces in the embodiment of the present invention.
Embodiment
The inventive method can be for generation of 16-QAM or 256-QAM flashlight.Process according to mode (1) if produce 16-QAM flashlight, process according to mode (2) if produce 256-QAM flashlight.
Mode (1) is input as QPSK flashlight, regulate the polarization state of QPSK flashlight, QPSK flashlight can be projected as two QPSK flashlights that polarization state is orthogonal on the fast axle of tunable differential group delay device and slow axis, between the QPSK flashlight of these two polarized orthogonals, introduce the group delay time difference carries different pieces of information information polarized orthogonal QPSK flashlight with emulation two-way, group delay extent is a positive integer QPSK flashlight code-element period and the half that is less than QPSK flashlight code element total length, then, the QPSK flashlight of two polarized orthogonals is carrying out projection after Polarization Control on arbitrary optical direction, identical its light field amplitude of two QPSK flashlights in polarization direction of the corresponding gained of projection differs 3dB (luminous power differs 6dB), both obtain 16-QAM flashlight through relevant vector addition on described optical direction.
Mode (2) is input as 16-QAM flashlight, regulate the polarization state of 16-QAM flashlight, 16-QAM flashlight can be projected as two 16-QAM flashlights that polarization state is orthogonal on the fast axle of tunable differential group delay device and slow axis, between the 16-QAM flashlight of these two polarized orthogonals, introduce the group delay time difference carries different pieces of information information polarized orthogonal 16-QAM flashlight with emulation two-way, group delay extent is a positive integer 16-QAM flashlight code-element period and the half that is less than 16-QAM flashlight code element total length, then, the 16-QAM flashlight of two polarized orthogonals is carrying out projection after Polarization Control on arbitrary optical direction, identical its light field amplitude of two 16-QAM flashlights in polarization direction of the corresponding gained of projection differs 6dB (luminous power differs 12dB), both obtain 256-QAM flashlight through relevant vector addition on described optical direction.
Further, in mode (1), tunable differential group delay device can be polarization mode dispersion emulating instrument (PMD Emulator), also can be the device that polarization maintaining optical fibre (PMF) etc. has birefringent characteristic, be characterized in thering is fast axle (F) (refractive index is little) and the slow axis (S) (refractive index is large) that refractive index is different, fast axle and slow-axis direction are orthogonal, corresponding light propagation velocity difference, therefore light is propagated and can be introduced different group delays along fast axle and slow axis, between fast axle and slow axis, introduces the group delay time difference.Before entering tunable differential group delay device, can use Polarization Controller (PC) to carry out Polarization Control to QPSK flashlight.After tunable differential group delay device, can use the given optical direction of analyzer, between tunable differential group delay device and analyzer, can utilize Polarization Controller to the fast axle of tunable differential group delay device and slow-axis direction on the QPSK flashlight of pairwise orthogonal carry out Polarization Control.The result that former and later two Polarization Controllers of tunable differential group delay device regulate will make the light field amplitude of tunable differential group delay device fast axle QPSK flashlight and the projection on the given optical direction of analyzer of slow axis QPSK flashlight differ 3dB (luminous power differs 6dB), the adjustment state that meets two Polarization Controllers of this condition can have multiple combination, one of them can be like this: regulate the Polarization Controller before tunable differential group delay device to make the light field amplitude of QPSK flashlight two cross-polarization QPSK flashlights of projection gained on the fast axle of tunable differential group delay device and slow axis differ 3dB (luminous power differs 6dB), regulate the Polarization Controller after tunable differential group delay device that two cross-polarization QPSK flashlights and the given optical direction angle 45 of analyzer are spent.
Further, in mode (2), tunable differential group delay device can be polarization mode dispersion emulating instrument, also can be the device that polarization maintaining optical fibre etc. has birefringent characteristic, be characterized in thering is fast axle (F) (refractive index is little) and the slow axis (S) (refractive index is large) that refractive index is different, fast axle and slow-axis direction are orthogonal, corresponding light propagation velocity difference, therefore light is propagated and can be introduced different group delays along fast axle and slow axis, between fast axle and slow axis, introduces the group delay time difference.Before entering tunable differential group delay device, can use Polarization Controller to carry out Polarization Control to 16-QAM flashlight.After tunable differential group delay device, can use the given optical direction of analyzer, between tunable differential group delay device and analyzer, can utilize Polarization Controller to the fast axle of tunable differential group delay device and slow-axis direction on the 16-QAM flashlight of pairwise orthogonal carry out Polarization Control.The result that former and later two Polarization Controllers of tunable differential group delay device regulate will make the light field amplitude of tunable differential group delay device fast axle 16-QAM flashlight and the projection on the given optical direction of analyzer of slow axis 16-QAM flashlight differ 6dB (luminous power differs 12dB), the adjustment state that meets two Polarization Controllers of this condition can have multiple combination, one of them can be like this: regulate the Polarization Controller before tunable differential group delay device to make the light field amplitude of 16-QAM flashlight two cross-polarization 16-QAM flashlights of projection gained on the fast axle of tunable differential group delay device and slow axis differ 6dB (luminous power differs 12dB), regulate the Polarization Controller after tunable differential group delay device that two cross-polarization 16-QAM flashlights and the given optical direction angle 45 of analyzer are spent.
Apparatus of the present invention can be the flashlight generation devices of simple function, for generation of 16-QAM flashlight (in the time that input is QPSK flashlight) or 256-QAM flashlight (in the time that input is 16-QAM flashlight); Also can be the flashlight generation device of cascade system, can be used for utilizing QPSK flashlight to produce 256-QAM flashlight.
First be specifically described for the second way below.This device comprises first to fourth Polarization Controller, first, the second tunable differential group delay device, with first, the second analyzer, wherein, first, the second tunable differential group delay device can be polarization mode dispersion emulating instrument (PMD Emulator), also can be the device that polarization maintaining optical fibre (PMF) etc. has birefringent characteristic, be characterized in thering is fast axle (F) (refractive index is little) and the slow axis (S) (refractive index is large) that refractive index is different, fast axle and slow-axis direction are orthogonal, corresponding light propagation velocity difference, therefore light is propagated and can be introduced different group delays along fast axle and slow axis, between fast axle and slow axis, introduce the group delay time difference.
A port of the first Polarization Controller externally provides QPSK flashlight input port, another port of the first Polarization Controller, the first tunable differential group delay device, a port of the second Polarization Controller and the first analyzer connects and composes 16-QAM flashlight generation device successively, another port of the first analyzer externally provides 16-QAM flashlight output port, can be connected with of a 3rd Polarization Controller port (16-QAM flashlight input port is externally provided), another port of the 3rd Polarization Controller, the second tunable differential group delay device, a port of the 4th Polarization Controller and the second analyzer connects and composes 256-QAM flashlight generation device successively, another port of the second analyzer externally provides 256-QAM flashlight output port.
The group delay time difference that first, second is tunable introduces between the fast axle of differential group delay device and slow axis is a positive integer flashlight code-element period and the half that is less than flashlight code element total length.Differ 3dB (luminous power differs 6dB) by identical its light field amplitude of two QPSK flashlights in polarization direction that the first Polarization Controller and the adjusting of the second Polarization Controller is made to the fast axle QPSK of the first tunable differential group delay device flashlight and slow axis QPSK flashlight projection gained on the first analyzer optical direction; Differ 6dB (luminous power differs 12dB) by identical its light field amplitude of two 16-QAM flashlights in polarization direction that the 3rd Polarization Controller and the adjusting of the 4th Polarization Controller is made to the fast axle 16-QAM of the second tunable differential group delay device flashlight and slow axis 16-QAM flashlight projection gained on the second analyzer optical direction.
Apparatus of the present invention can be used as independently 16-QAM flashlight generation device or 256-QAM flashlight generation device, and they connect and compose successively by the first Polarization Controller, the first tunable differential group delay device, the second Polarization Controller and the first analyzer.While being input as QPSK flashlight, be output as 16-QAM flashlight; While being input as 16-QAM flashlight, be output as 256-QAM flashlight.The group delay time difference of introducing between the first fast axle of tunable differential group delay device (F) and slow axis (S) is a positive integer flashlight code-element period and the half that is less than flashlight code element total length.In the time that the input port of the first Polarization Controller receives QPSK flashlight, differ 3dB (luminous power differs 6dB) by identical its light field amplitude of two QPSK flashlights in polarization direction that the first Polarization Controller and the adjusting of the second Polarization Controller is made to the fast axle QPSK of the first tunable differential group delay device flashlight and slow axis QPSK flashlight projection gained on the first analyzer optical direction, both export 16-QAM flashlight through relevant vector addition at the output port of the first analyzer; In the time that the input port of the first Polarization Controller receives 16-QAM flashlight, differ 6dB (luminous power differs 12dB) by identical its light field amplitude of two 16-QAM flashlights in polarization direction that the first Polarization Controller and the adjusting of the second Polarization Controller is made to the fast axle 16-QAM of the first tunable differential group delay device flashlight and slow axis 16-QAM flashlight projection gained on the first analyzer optical direction, both export 256-QAM flashlight through relevant vector addition at the output port of the first analyzer.
The 16-QAM of high speed optical communication system and production method and the device of 256-QAM flashlight of being applicable to of the present invention, adopts tunable differential group delay device and relevant vector addition to realize.The vector addition of two relevant QPSK flashlights can obtain 16-QAM flashlight, and the vector addition of two relevant 16-QAM flashlights can obtain 256-QAM flashlight.Below in conjunction with specific embodiment, the present invention is described in further detail.
Embodiment is for utilizing tunable differential group delay device and relevant vector addition to produce 10-Gbaud/s16-QAM and 256-QAM flashlight.
The production method of 16-QAM of the present invention or 256-QAM flashlight, as shown in Figure 1.Process according to mode (1) if produce 16-QAM flashlight, process according to mode (2) if produce 256-QAM flashlight.
Mode (1) input 10-Gbaud/s QPSK flashlight, on its fast axle at tunable differential group delay device and slow axis, can be projected as the 10-Gbaud/s QPSK flashlight of two polarized orthogonals, tunable differential group delay device can be for polarization mode dispersion emulating instrument, can be also the device that polarization maintaining optical fibre etc. has birefringent characteristic.During through tunable differential group delay device, between fast axle (F) and the 10-Gbaud/s QPSK flashlight of upper two polarized orthogonals of slow axis (S), introduce the group delay time difference, group delay extent is doubly (as the 200ps) of positive integer of 10-Gbaud/s QPSK flashlight code-element period (100ps).Before entering tunable differential group delay device, can use Polarization Controller to carry out Polarization Control to 10-Gbaud/s QPSK flashlight.After tunable differential group delay device, can use the given optical direction of analyzer, between tunable differential group delay device and analyzer, can utilize Polarization Controller to the fast axle of tunable differential group delay device and slow-axis direction on the 10-Gbaud/s QPSK flashlight of pairwise orthogonal carry out Polarization Control.The result that former and later two Polarization Controllers of tunable differential group delay device regulate will make the light field amplitude of tunable differential group delay device fast axle 10-Gbaud/s QPSK flashlight and the projection on the given optical direction of analyzer of slow axis 10-Gbaud/s QPSK flashlight differ 3dB (luminous power differs 6dB).It should be noted that, the adjustment state that meets two Polarization Controllers of this condition can be a variety of, here provide wherein a kind of: regulate the Polarization Controller before tunable differential group delay device to make the light field amplitude of 10-Gbaud/s QPSK flashlight two cross-polarization 10-Gbaud/s QPSK flashlights of projection gained on the fast axle of tunable differential group delay device and slow axis differ 3dB (luminous power differs 6dB), regulate the Polarization Controller after tunable differential group delay device that two cross-polarization 10-Gbaud/s QPSK flashlights and the given optical direction angle 45 of analyzer are spent.Finally, on the given optical direction of analyzer, the vector addition of two relevant 10-Gbaud/s QPSK flashlights (light field amplitude differs 3dB, and luminous power differs 6dB) can obtain 10-Gbaud/s 16-QAM flashlight.
Mode (2) input 10-Gbaud/s 16-QAM flashlight, on its fast axle at tunable differential group delay device and slow axis, can be projected as the 10-Gbaud/s 16-QAM flashlight of two polarized orthogonals, tunable differential group delay device can be for polarization mode dispersion emulating instrument, can be also the device that polarization maintaining optical fibre etc. has birefringent characteristic.During through tunable differential group delay device, between fast axle (F) and the 10-Gbaud/s 16-QAM flashlight of upper two polarized orthogonals of slow axis (S), introduce the group delay time difference, group delay extent is doubly (as the 200ps) of positive integer of 10-Gbaud/s 16-QAM flashlight code-element period (100ps).Before entering tunable differential group delay device, can use Polarization Controller to carry out Polarization Control to 10-Gbaud/s16-QAM flashlight.After tunable differential group delay device, can use the given optical direction of analyzer, between tunable differential group delay device and analyzer, can utilize Polarization Controller to the fast axle of tunable differential group delay device and slow-axis direction on the 10-Gbaud/s16-QAM flashlight of pairwise orthogonal carry out Polarization Control.The result that former and later two Polarization Controllers of tunable differential group delay device regulate will make the light field amplitude of tunable differential group delay device fast axle 10-Gbaud/s 16-QAM flashlight and the projection on the given optical direction of analyzer of slow axis 10-Gbaud/s 16-QAM flashlight differ 6dB (luminous power differs 12dB).It is worth mentioning that, the adjustment state that meets two Polarization Controllers of this condition has a variety of combinations possibilities, here provide wherein a kind of: regulate the Polarization Controller before tunable differential group delay device to make the light field amplitude of 10-Gbaud/s 16-QAM flashlight two cross-polarization 10-Gbaud/s 16-QAM flashlights of projection gained on the fast axle of tunable differential group delay device and slow axis differ 6dB (luminous power differs 12dB), regulate the Polarization Controller after tunable differential group delay device that two cross-polarization 10-Gbaud/s 16-QAM flashlights and the given optical direction angle 45 of analyzer are spent.Finally, on the given optical direction of analyzer, the vector addition of two relevant 10-Gbaud/s16-QAM flashlights (light field amplitude differs 6dB, and luminous power differs 12dB) can obtain 10-Gbaud/s 256-QAM flashlight.
As shown in Figure 1, this device comprises the first Polarization Controller 1, the first tunable differential group delay device 2, the second Polarization Controller 3, the first analyzer 4, the 3rd Polarization Controller 5, the second tunable differential group delay device 6, the 4th Polarization Controller 7 and the second analyzer 8 to the flashlight generation device of cascade system provided by the invention.Wherein, the first tunable differential group delay device 2 and the second tunable differential group delay device 6 can be polarization mode dispersion emulating instruments, can be also the devices that polarization maintaining optical fibre etc. has birefringent characteristic.The group delay extent of the first tunable differential group delay device 2 and the second tunable differential group delay device 6 correspondences be flashlight code-element period positive integer doubly and be less than the half of flashlight code element total length.For the generation device of 10-Gbaud/s 16-QAM or 10-Gbaud/s 256-QAM flashlight, this group delay extent is the positive integer times of flashlight code-element period 100ps, such as being 200ps, this group delay time difference, 200ps was also applicable to the generation of some other speed 16-QAM and 256-QAM flashlight simultaneously, as 20-Gbaud/s, 40-Gbaud/s, 50-Gbaud/s and 100-Gbaud/s etc.
A port of the first Polarization Controller 1 externally provides 10-Gbaud/s QPSK flashlight input port, another port of the first Polarization Controller 1, the first tunable differential group delay device 2, a port of the second Polarization Controller 3 and the first analyzer 4 connects and composes 10-Gbaud/s 16-QAM flashlight generation device successively, another port of the first analyzer 4 externally provides 10-Gbaud/s 16-QAM flashlight output port, can be connected with of the 3rd Polarization Controller 5 port (10-Gbaud/s16-QAM flashlight input port is externally provided), another port of the 3rd Polarization Controller 5, the second tunable differential group delay device 6, a port of the 4th Polarization Controller 7 and the second analyzer 8 connects and composes 10-Gbaud/s 256-QAM flashlight generation device successively, another port of the second analyzer 8 externally provides 10-Gbaud/s 256-QAM flashlight output port.
By make the first tunable differential group delay device 2 fast axle (F) 10-Gbaud/s QPSK flashlight two 10-Gbaud/s QPSK flashlight its light field amplitudes identical with the polarization direction of slow axis (S) 10-Gbaud/s QPSK flashlight projection gained on the first analyzer 4 optical directions differ 3dB (luminous power differs 6dB) to the first Polarization Controller 1 and the adjusting of the second Polarization Controller 3; By make the second tunable differential group delay device 6 fast axle (F) 10-Gbaud/s 16-QAM flashlight two 10-Gbaud/s 16-QAM flashlight its light field amplitudes identical with the polarization direction of slow axis (S) 10-Gbaud/s 16-QAM flashlight projection gained on the second analyzer 8 optical directions differ 6dB (luminous power differs 12dB) to the 3rd Polarization Controller 5 and the adjusting of the 4th Polarization Controller 7.
Device of the present invention can be used as independently 16-QAM flashlight generation device or 256-QAM flashlight generation device, and lower mask body describes.
As shown in Figure 2, utilize the vector addition of two relevant QPSK flashlights can obtain 16-QAM flashlight, wherein the light field amplitude of two relevant QPSK flashlights differs 3dB (luminous power differs 6dB).
As shown in Figure 3,16-QAM flashlight generation device is connected and composed successively by the first Polarization Controller 1, the first tunable differential group delay device 2, the second Polarization Controller 3 and the first analyzer 4.The first Polarization Controller 1 is inputted QPSK flashlight, differ 3dB (luminous power differs 6dB) by identical its light field amplitude of two QPSK flashlights in polarization direction that the first Polarization Controller 1 and the adjusting of the second Polarization Controller 3 is made to the first tunable differential group delay device 2 fast axle (F) QPSK flashlights and slow axis (S) QPSK flashlight projection gained on the first analyzer 4 optical directions, both export 16-QAM flashlight through relevant vector addition after the first analyzer 4.
As shown in Figure 4, utilize the vector addition of two relevant 16-QAM flashlights can obtain 256-QAM flashlight, wherein the light field amplitude of two relevant 16-QAM flashlights differs 6dB (luminous power differs 12dB).
As shown in Figure 5,256-QAM flashlight generation device is connected and composed successively by the first Polarization Controller 1, the first tunable differential group delay device 2, the second Polarization Controller 3 and the first analyzer 4.The first Polarization Controller 1 is inputted 16-QAM flashlight, differ 6dB (luminous power differs 12dB) by identical its light field amplitude of two 16-QAM flashlights in polarization direction that the first Polarization Controller 1 and the adjusting of the second Polarization Controller 3 is made to the first tunable differential group delay device 2 fast axle (F) 16-QAM flashlights and slow axis (S) 16-QAM flashlight projection gained on the first analyzer 4 optical directions, both export 256-QAM flashlight through relevant vector addition after the first analyzer 4.
As Fig. 6 has illustrated the planisphere of the 10-Gbaud/s 16-QAM flashlight that embodiment produces.
The present invention is not limited to above-mentioned embodiment; persons skilled in the art are according to content disclosed by the invention; can adopt other multiple embodiment to implement the present invention; therefore; every employing project organization of the present invention and thinking; do some simple designs that change or change, all fall into the scope of protection of the invention.
Claims (6)
1. a production method for quadrature amplitude modulation signal light produces 16-QAM flashlight in the time being input as QPSK flashlight, produces 256-QAM flashlight in the time being input as 16-QAM flashlight, and its production process is:
Regulate the polarization state of input signal light, make to be projected as two flashlights that polarization state is orthogonal on its fast axle at tunable differential group delay device and slow axis, during through tunable differential group delay device, between the flashlight of these two polarized orthogonals, introduce the group delay time difference, group delay extent is a positive integer flashlight code-element period and the half that is less than flashlight code element total length, then, the flashlight of two polarized orthogonals is carrying out projection after Polarization Control on arbitrary optical direction, two identical flashlights of polarization direction of the corresponding gained of projection obtain corresponding quadrature amplitude modulation signal light through relevant vector addition on described optical direction,
Carry out polarization regulation and control by the front and back at tunable differential group delay device, in the time being input as QPSK flashlight, on described optical direction, identical its light field amplitude of two QPSK flashlights in the polarization direction of projection gained differs 3dB, luminous power differs 6dB, and both produce 16-QAM flashlight through relevant vector addition on described optical direction; In the time being input as 16-QAM flashlight, on described optical direction, identical its light field amplitude of two 16-QAM flashlights in the polarization direction of projection gained differs 6dB, luminous power differs 12dB, and both produce 256-QAM flashlight through relevant vector addition on described optical direction.
2. the production method of quadrature amplitude modulation signal light according to claim 1, it is characterized in that, in the time being input as QPSK flashlight, using the 16-QAM flashlight of output as new input signal light, repeating described production process and further export 256-QAM flashlight.
3. a generation device for quadrature amplitude modulation signal light, is characterized in that: this device comprises the first Polarization Controller, the first tunable differential group delay device, the second Polarization Controller and the first analyzer; The input port of the first Polarization Controller, be used for receiving QPSK or 16-QAM flashlight, the output port of the first Polarization Controller is connected with the input port of the first analyzer with the second Polarization Controller by the first tunable differential group delay device successively, and the output port of the first analyzer is for corresponding output 16-QAM or 256-QAM flashlight;
The group delay time difference of introducing between the first fast axle of tunable differential group delay device and slow axis is a positive integer flashlight code-element period and the half that is less than flashlight code element total length;
In the time that the input port of the first Polarization Controller receives QPSK flashlight, differ 3dB by identical its light field amplitude of two QPSK flashlights in polarization direction that the first Polarization Controller and the adjusting of the second Polarization Controller is made to the fast axle QPSK of the first tunable differential group delay device flashlight and slow axis QPSK flashlight projection gained on the first analyzer optical direction, luminous power differs 6dB, and both export 16-QAM flashlight through relevant vector addition at the output port of the first analyzer;
In the time that the input port of the first Polarization Controller receives 16-QAM flashlight, differ 6dB by identical its light field amplitude of two 16-QAM flashlights in polarization direction that the first Polarization Controller and the adjusting of the second Polarization Controller is made to the fast axle 16-QAM of the first tunable differential group delay device flashlight and slow axis 16-QAM flashlight projection gained on the first analyzer optical direction, luminous power differs 12dB, and both export 256-QAM flashlight through relevant vector addition at the output port of the first analyzer.
4. generation device according to claim 3, is characterized in that: the first Polarization Controller is used for receiving QPSK flashlight, and this device also comprises the 3rd Polarization Controller, the second tunable differential group delay device, the 4th Polarization Controller and the second analyzer; The input port of the 3rd Polarization Controller is connected with the output port of the first analyzer; The output port of the 3rd Polarization Controller is connected with the input port of the second analyzer by the second tunable differential group delay device, the 4th Polarization Controller successively, and the output port of the second analyzer is used for exporting 256-QAM flashlight;
The group delay time difference of introducing between the second fast axle of tunable differential group delay device and slow axis is a positive integer flashlight code-element period and the half that is less than flashlight code element total length; Differ 6dB by identical its light field amplitude of two 16-QAM flashlights in polarization direction that the 3rd Polarization Controller and the adjusting of the 4th Polarization Controller is made to the fast axle 16-QAM of the second tunable differential group delay device flashlight and slow axis 16-QAM flashlight projection gained on the second analyzer optical direction, luminous power differs 12dB.
5. according to the generation device described in claim 3 or 4, it is characterized in that: described the first tunable differential group delay device is the device with birefringent characteristic.
6. generation device according to claim 4, is characterized in that: described the second tunable differential group delay device is the device with birefringent characteristic.
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| WO2016029477A1 (en) * | 2014-08-30 | 2016-03-03 | 华为技术有限公司 | Method and apparatus for generating a star 16qam signal |
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| CN101964683A (en) * | 2010-09-21 | 2011-02-02 | 上海大学 | Serial-parallel connection modulation optical frequency multiplication millimeter-wave RoF (Radio Over Fiber) system and QPSK (Quadrature Phase Shift Keying) /16QAM (Quadrature Amplitude Modulation) modulation method thereof |
| CN102137057A (en) * | 2010-06-18 | 2011-07-27 | 华为技术有限公司 | Signal generation method and device |
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| CN101964683A (en) * | 2010-09-21 | 2011-02-02 | 上海大学 | Serial-parallel connection modulation optical frequency multiplication millimeter-wave RoF (Radio Over Fiber) system and QPSK (Quadrature Phase Shift Keying) /16QAM (Quadrature Amplitude Modulation) modulation method thereof |
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