CN102571682A - 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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- CN102571682A CN102571682A CN2011104248445A CN201110424844A CN102571682A CN 102571682 A CN102571682 A CN 102571682A CN 2011104248445 A CN2011104248445 A CN 2011104248445A CN 201110424844 A CN201110424844 A CN 201110424844A CN 102571682 A CN102571682 A CN 102571682A
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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 the 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 combines coherent detection to become the important trend of optical communication development.Than traditional binary modulation format (1 bits/sym) like on-off keying (OOK), differential phase keying (DPSK) (DPSK); Advanced advanced modulation formats adopts multi-system; Promptly in a code element, comprise a plurality of 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 comprise again multiple, like 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 contains a plurality of bit informations owing to be multistage amplitude and phase modulated a code element, in the high-speed high capacity fiber optic transmission system, has obtained extensive use at present.
The method and apparatus that tradition is used to produce QAM is to use inphase/orthogonal modulator (I/Q modulator) or the single I/Q modulator and the multistage signal of telecommunication of cascade; Though widely use but implement comparatively complicated; It is big more that multistage more QAM implements difficulty, and the QAM performance degradation that produces is serious more.Simultaneously, chip rate is limited relatively, is difficult to produce multistage QAM at a high speed.If can find a kind of method and apparatus that produces emulation QAM, it has the advantages that speed is not limited and be simple and easy to realize, then will have important value for carrying out the application study of QAM in the high-speed high capacity optical communication system in a deep going way.
Summary of the invention
The purpose of this invention is to provide a kind of production method and device that is applied to the quadrature amplitude modulation signal light of high speed optical communication system; The present invention utilizes tunable differential group delay device, the QPSK or the 16-QAM flashlight of input is handled, through 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 that used device is passive device, can be operated in (no operating rate restriction) under the 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 the 16-QAM flashlight when being input as the QPSK flashlight, when being input as the 16-QAM flashlight, produce the 256-QAM flashlight, and its production process is:
Regulate the input signal polarization state of light; Make it on the fast axle of tunable differential group delay device and slow axis, be projected as the flashlight of two polarization state quadratures; Between the flashlight of these two polarized orthogonals, introduce the group delay time difference during through tunable differential group delay device; The group delay extent is a positive integer flashlight code-element period and half the less than flashlight code element total length; Then, the flashlight of two polarized orthogonals is carrying out projection through after the Polarization Control on arbitrary optical direction, and two identical flashlights of the polarization direction of the corresponding gained of projection obtain corresponding quadrature amplitude modulation signal light through relevant vector addition on said optical direction.Polarization is regulated and control through carrying out in the front and back of tunable differential group delay device; When being input as the QPSK flashlight; Identical its light field amplitude of two QPSK flashlights in the polarization direction of projection gained differs 3dB on said optical direction, and both produce the 16-QAM flashlight through relevant vector addition on said optical direction; When being input as the 16-QAM flashlight, identical its light field amplitude of two 16-QAM flashlights in the polarization direction of projection gained differs 6dB on said optical direction, and both produce the 256-QAM flashlight through relevant vector addition on said optical direction.
As the improvement of technique scheme, when being input as the QPSK flashlight, the 16-QAM flashlight of exporting as new input signal light, is repeated described production process and further exports the 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 first Polarization Controller, the first tunable differential group delay device, second Polarization Controller and first analyzer; The input port of first Polarization Controller; Be used to receive QPSK or 16-QAM flashlight; The output port of first Polarization Controller is connected with the input port of second Polarization Controller with first analyzer through the first tunable differential group delay device successively, and the output port of first analyzer is used for corresponding output 16-QAM or 256-QAM flashlight.The group delay time difference of introducing between fast axle of the first tunable differential group delay device and the slow axis is a positive integer flashlight code-element period and less than half of flashlight code element total length.When the input port of first Polarization Controller receives the QPSK flashlight; Make tunable differential group delay device fast axle QPSK flashlight two QPSK flashlights its light field amplitude identical with the polarization direction of slow axis QPSK flashlight projection gained on the first analyzer optical direction of winning differ 3dB through the adjusting to first Polarization Controller and second Polarization Controller, both export the 16-QAM flashlight through relevant vector addition at the output port of first analyzer; When the input port of first Polarization Controller receives the 16-QAM flashlight; Make tunable differential group delay device fast axle 16-QAM flashlight two 16-QAM flashlights its light field amplitude identical with the polarization direction of slow axis 16-QAM flashlight projection gained on the first analyzer optical direction of winning differ 6dB through the adjusting to first Polarization Controller and second Polarization Controller, both export the 256-QAM flashlight through relevant vector addition at the output port of first analyzer.
As the improvement of said apparatus, first Polarization Controller is used to receive the QPSK flashlight, and this device also comprises the 3rd Polarization Controller, the second tunable differential group delay device, the 4th Polarization Controller and second analyzer; The input port of the 3rd Polarization Controller is connected with the output port of first analyzer; The output port of the 3rd Polarization Controller is connected with the input port of second analyzer through the second tunable differential group delay device, the 4th Polarization Controller successively, and the output port of second analyzer is used to export the 256-QAM flashlight.The group delay time difference of introducing between fast axle of the second tunable differential group delay device and the slow axis is a positive integer flashlight code-element period and less than half of flashlight code element total length.Make the second tunable differential group delay device fast axle 16-QAM flashlight, two 16-QAM flashlights its light field amplitude identical differ 6dB through adjusting with the polarization direction of slow axis 16-QAM flashlight projection gained on the second analyzer optical direction to the 3rd Polarization Controller and the 4th Polarization Controller.
The present invention has following beneficial effect:
1, than the generation scheme of traditional Q AM flashlight, the present invention adopts the differential group delay device to produce the QAM flashlight, and this provides a kind of new thinking, method and apparatus for producing the QAM flashlight, and scheme is simple and easy to realize, and is easy and simple to handle.
2, the production method of QAM flashlight according to the invention and device, employing all are passive devices, therefore unrestricted on speed, be applicable to the generation of High Speed QAM flashlight, such as 40Gbaud/s, 100Gbaud/s even higher rate.
3, the production method of QAM flashlight according to the invention and device except not receiving the rate limit, because passive device can not introduced the influence of additional noise, therefore can produce the high-quality QAM flashlight of low noise.
4, the production method of QAM flashlight according to the invention and device; Through changing the group delay extent of tunable differential group delay device; Can be applied to the generation (like 10Gbaud/s, 40Gbaud/s, 100Gbaud/s etc.) of different rates QAM flashlight; Not only can be used to produce the 16-QAM flashlight through regulating Polarization Controller, can also produce the 256-QAM flashlight, therefore have operating rate and the reconfigurability of realizing function.
Description of drawings
Fig. 1 is the theory structure sketch map 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 sketch map 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 sketch map 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 invention.
Embodiment
The inventive method can be used to produce 16-QAM or 256-QAM flashlight.Handle according to mode (1) if produce the 16-QAM flashlight, handle according to mode (2) if produce the 256-QAM flashlight.
Mode (1) is input as the QPSK flashlight; Regulate QPSK signal polarization state of light; The QPSK flashlight can be projected as the QPSK flashlight of two polarization state quadratures on the fast axle of tunable differential group delay device and slow axis; The introducing group delay time difference is carried the QPSK flashlight of different pieces of information information polarized orthogonal between the QPSK flashlight of these two polarized orthogonals with the emulation two-way; The group delay extent is a positive integer QPSK flashlight code-element period and half the less than QPSK flashlight code element total length, and then, the QPSK flashlight of two polarized orthogonals is carrying out projection through after the 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), and both obtain the 16-QAM flashlight through relevant vector addition on said optical direction.
Mode (2) is input as the 16-QAM flashlight; Regulate 16-QAM signal polarization state of light; The 16-QAM flashlight can be projected as the 16-QAM flashlight of two polarization state quadratures on the fast axle of tunable differential group delay device and slow axis; The introducing group delay time difference is carried the 16-QAM flashlight of different pieces of information information polarized orthogonal between the 16-QAM flashlight of these two polarized orthogonals with the emulation two-way; The group delay extent is a positive integer 16-QAM flashlight code-element period and half the less than 16-QAM flashlight code element total length; Then; The 16-QAM flashlight of two polarized orthogonals is carrying out projection through after the 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), and both obtain the 256-QAM flashlight through relevant vector addition on said optical direction.
Further; Tunable differential group delay device can be polarization mode dispersion emulating instrument (PMD Emulator) in the mode (1), also can be the device that polarization maintaining optical fibre (PMF) etc. has birefringent characteristic, is characterized in having refractive index different fast axle (F) (refractive index is little) and slow axis (S) (refractive index is big); Fast axle and slow-axis direction quadrature; Correspondence light propagation velocity difference, so the fast axle in light edge and the different group delay of slow axis propagation meeting introducing, i.e. the introducing group delay time difference between fast axle and slow axis.Before getting into tunable differential group delay device, can use Polarization Controller (PC) that the QPSK flashlight is carried out Polarization Control.After tunable differential group delay device; Can use the given optical direction of analyzer, can utilize between tunable differential group delay device and the analyzer Polarization Controller to tunable differential group delay device on fast axle and the slow-axis direction QPSK flashlight of pairwise orthogonal carry out Polarization Control.The result that former and later two Polarization Controllers of tunable differential group delay device are regulated 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 satisfies two Polarization Controllers of this condition can have multiple combination; One of them can be like this: regulate Polarization Controller before the tunable differential group delay device and make the light field amplitude of QPSK flashlight two cross-polarization QPSK of projection gained flashlight on the fast axle of tunable differential group delay device and slow axis differ 3dB (luminous power differs 6dB), the Polarization Controller of regulating behind the tunable differential group delay device makes two cross-polarization QPSK flashlights and the given optical direction angle 45 of analyzer spend.
Further; Tunable differential group delay device can be the polarization mode dispersion emulating instrument in the mode (2), also can be the device that polarization maintaining optical fibre etc. has birefringent characteristic, is characterized in having refractive index different fast axle (F) (refractive index is little) and slow axis (S) (refractive index is big); Fast axle and slow-axis direction quadrature; Correspondence light propagation velocity difference, so the fast axle in light edge and the different group delay of slow axis propagation meeting introducing, i.e. the introducing group delay time difference between fast axle and slow axis.Before getting into tunable differential group delay device, can use Polarization Controller that the 16-QAM flashlight is carried out Polarization Control.After tunable differential group delay device; Can use the given optical direction of analyzer, can utilize between tunable differential group delay device and the analyzer Polarization Controller to tunable differential group delay device on fast axle and the slow-axis direction 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 are regulated 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 satisfies two Polarization Controllers of this condition can have multiple combination; One of them can be like this: regulate Polarization Controller before the tunable differential group delay device and make the light field amplitude of 16-QAM flashlight two cross-polarization 16-QAM of projection gained flashlight on the fast axle of tunable differential group delay device and slow axis differ 6dB (luminous power differs 12dB), the Polarization Controller of regulating behind the tunable differential group delay device makes two cross-polarization 16-QAM flashlights and the given optical direction angle 45 of analyzer spend.
Apparatus of the present invention can be the flashlight generation devices of simple function, are used to produce 16-QAM flashlight (when input is the QPSK flashlight) or 256-QAM flashlight (when input is the 16-QAM flashlight); Also can be the flashlight generation device of cascade system, can be used for utilizing the QPSK flashlight to produce the 256-QAM flashlight.
Following elder generation specifies to the second way.This device comprises first to fourth Polarization Controller, first, second is tunable differential group delay device and first, second analyzer; Wherein, First, second is tunable, and the 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, is characterized in having refractive index different fast axle (F) (refractive index is little) and slow axis (S) (refractive index is big); Fast axle and slow-axis direction quadrature; Correspondence light propagation velocity difference, so the fast axle in light edge and the different group delay of slow axis propagation meeting introducing, i.e. the introducing group delay time difference between fast axle and slow axis.
A port of first Polarization Controller externally provides QPSK flashlight input port; A port of another port of first Polarization Controller, the first tunable differential group delay device, second Polarization Controller and first analyzer connects and composes 16-QAM flashlight generation device successively; Another port of first analyzer externally provides 16-QAM flashlight output port; Can be connected with a port (16-QAM flashlight input port externally is provided) of the 3rd Polarization Controller; A port of another port of the 3rd Polarization Controller, the second tunable differential group delay device, the 4th Polarization Controller and second analyzer connects and composes 256-QAM flashlight generation device successively, and another port of second analyzer externally provides 256-QAM flashlight output port.
The group delay time difference of introducing between fast axle of first, second is tunable differential group delay device and the slow axis is a positive integer flashlight code-element period and less than half of flashlight code element total length.Make tunable differential group delay device fast axle QPSK flashlight two QPSK flashlights its light field amplitude identical of winning differ 3dB (luminous power differs 6dB) through adjusting with the polarization direction of slow axis QPSK flashlight projection gained on the first analyzer optical direction to first Polarization Controller and second Polarization Controller; Make the second tunable differential group delay device fast axle 16-QAM flashlight, two 16-QAM flashlights its light field amplitude identical differ 6dB (luminous power differs 12dB) through adjusting with the polarization direction of slow axis 16-QAM flashlight projection gained on the second analyzer optical direction to the 3rd Polarization Controller and the 4th Polarization Controller.
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 by first Polarization Controller, the first tunable differential group delay device, second Polarization Controller and first analyzer successively.When being input as the QPSK flashlight, be output as the 16-QAM flashlight; When being input as the 16-QAM flashlight, be output as the 256-QAM flashlight.The group delay time difference of introducing between the fast axle of the first tunable differential group delay device (F) and the slow axis (S) is a positive integer flashlight code-element period and less than half of flashlight code element total length.When the input port of first Polarization Controller receives the QPSK flashlight; Make tunable differential group delay device fast axle QPSK flashlight two QPSK flashlights its light field amplitude identical with the polarization direction of slow axis QPSK flashlight projection gained on the first analyzer optical direction of winning differ 3dB (luminous power differs 6dB) through the adjusting to first Polarization Controller and second Polarization Controller, both export the 16-QAM flashlight through relevant vector addition at the output port of first analyzer; When the input port of first Polarization Controller receives the 16-QAM flashlight; Make tunable differential group delay device fast axle 16-QAM flashlight two 16-QAM flashlights its light field amplitude identical with the polarization direction of slow axis 16-QAM flashlight projection gained on the first analyzer optical direction of winning differ 6dB (luminous power differs 12dB) through the adjusting to first Polarization Controller and second Polarization Controller, both export the 256-QAM flashlight through relevant vector addition at the output port of first analyzer.
The 16-QAM of high speed optical communication system and the 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 the 16-QAM flashlight, and the vector addition of two relevant 16-QAM flashlights can obtain the 256-QAM flashlight.Below in conjunction with specific embodiment the present invention is done further detailed description.
Embodiment produces 10-Gbaud/s16-QAM and 256-QAM flashlight for utilizing tunable differential group delay device and relevant vector addition.
The production method of 16-QAM of the present invention or 256-QAM flashlight, as shown in Figure 1.Handle according to mode (1) if produce the 16-QAM flashlight, handle according to mode (2) if produce the 256-QAM flashlight.
Mode (1) input 10-Gbaud/s QPSK flashlight; It can be projected as the 10-Gbaud/s QPSK flashlight of two polarized orthogonals on the fast axle of tunable differential group delay device and slow axis; Tunable differential group delay device can be the polarization mode dispersion emulating instrument, also can be the device that polarization maintaining optical fibre etc. has birefringent characteristic.Introduce the group delay time difference between the 10-Gbaud/s QPSK flashlight of fast axle (F) and last two polarized orthogonals of slow axis (S) during through tunable differential group delay device, the group delay extent is the positive integer times (like 200ps) of 10-Gbaud/s QPSK flashlight code-element period (100ps).Before getting into tunable differential group delay device, can use Polarization Controller that 10-Gbaud/s QPSK flashlight is carried out Polarization Control.After tunable differential group delay device; Can use the given optical direction of analyzer, can utilize between tunable differential group delay device and the analyzer Polarization Controller to tunable differential group delay device on fast axle and the slow-axis direction 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 are regulated 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 satisfies two Polarization Controllers of this condition can be a variety of; Here provide wherein a kind of: regulate Polarization Controller before the tunable differential group delay device and make the light field amplitude of 10-Gbaud/s QPSK flashlight two cross-polarization 10-Gbaud/s of projection gained QPSK flashlight on the fast axle of tunable differential group delay device and slow axis differ 3dB (luminous power differs 6dB), the Polarization Controller of regulating behind the tunable differential group delay device makes two cross-polarization 10-Gbaud/s QPSK flashlights and the given optical direction angle 45 of analyzer spend.At last, the vector addition of two relevant 10-Gbaud/s QPSK flashlights (the light field amplitude differs 3dB, and luminous power differs 6dB) can obtain 10-Gbaud/s 16-QAM flashlight on the given optical direction of analyzer.
Mode (2) input 10-Gbaud/s 16-QAM flashlight; It can be projected as the 10-Gbaud/s 16-QAM flashlight of two polarized orthogonals on the fast axle of tunable differential group delay device and slow axis; Tunable differential group delay device can be the polarization mode dispersion emulating instrument, also can be the device that polarization maintaining optical fibre etc. has birefringent characteristic.Introduce the group delay time difference between the 10-Gbaud/s 16-QAM flashlight of fast axle (F) and last two polarized orthogonals of slow axis (S) during through tunable differential group delay device, the group delay extent is the positive integer times (like 200ps) of 10-Gbaud/s 16-QAM flashlight code-element period (100ps).Before getting into tunable differential group delay device, can use Polarization Controller that the 10-Gbaud/s16-QAM flashlight is carried out Polarization Control.After tunable differential group delay device; Can use the given optical direction of analyzer, can utilize between tunable differential group delay device and the analyzer Polarization Controller to tunable differential group delay device on fast axle and the slow-axis direction 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 are regulated 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).What deserves to be mentioned is; The adjustment state that satisfies two Polarization Controllers of this condition has a variety of combinations possibilities; Here provide wherein a kind of: regulate Polarization Controller before the tunable differential group delay device and make the light field amplitude of 10-Gbaud/s 16-QAM flashlight two cross-polarization 10-Gbaud/s of projection gained 16-QAM flashlight on the fast axle of tunable differential group delay device and slow axis differ 6dB (luminous power differs 12dB), the Polarization Controller of regulating behind the tunable differential group delay device makes two cross-polarization 10-Gbaud/s 16-QAM flashlights and the given optical direction angle 45 of analyzer spend.At last, the vector addition of two relevant 10-Gbaud/s16-QAM flashlights (the light field amplitude differs 6dB, and luminous power differs 12dB) can obtain 10-Gbaud/s 256-QAM flashlight on the given optical direction of analyzer.
The flashlight generation device of cascade system provided by the invention is as shown in Figure 1, this device comprises the tunable differential group delay device of first Polarization Controller 1, first 2, second Polarization Controller 3, first analyzer 4, the 3rd Polarization Controller 5, second is tunable differential group delay device 6, the 4th Polarization Controller 7 and second analyzer 8.Wherein, the first tunable differential group delay device 2 and the second tunable differential group delay device 6 can be the polarization mode dispersion emulating instruments, also can be the devices that polarization maintaining optical fibre etc. has birefringent characteristic.The first tunable differential group delay device 2 and the second tunable differential group delay device, 6 corresponding group delay extents are half the doubly and less than flashlight code element total length of the positive integer of flashlight code-element period.Generation device for 10-Gbaud/s 16-QAM or 10-Gbaud/s 256-QAM flashlight; This group delay extent be flashlight code-element period 100ps positive integer doubly; Such as being 200ps; This group delay time difference, 200ps also was applicable to the generation of some other speed 16-QAM and 256-QAM flashlight simultaneously, like 20-Gbaud/s, 40-Gbaud/s, 50-Gbaud/s and 100-Gbaud/s etc.
A port of first Polarization Controller 1 externally provides 10-Gbaud/s QPSK flashlight input port; A port of another port of first Polarization Controller 1, the first tunable differential group delay device 2, second Polarization Controller 3 and first analyzer 4 connects and composes 10-Gbaud/s 16-QAM flashlight generation device successively; Another port of first analyzer 4 externally provides 10-Gbaud/s 16-QAM flashlight output port; Can be connected with a port (10-Gbaud/s16-QAM flashlight input port externally is provided) of the 3rd Polarization Controller 5; A port of another port of the 3rd Polarization Controller 5, the second tunable differential group delay device 6, the 4th Polarization Controller 7 and second analyzer 8 connects and composes 10-Gbaud/s 256-QAM flashlight generation device successively, and another port of second analyzer 8 externally provides 10-Gbaud/s 256-QAM flashlight output port.
Make tunable differential group delay device 2 fast axle (F) 10-Gbaud/s QPSK flashlights two 10-Gbaud/s QPSK flashlight its light field amplitudes identical of winning differ 3dB (luminous power differs 6dB) through adjusting with the polarization direction of slow axis (S) 10-Gbaud/s QPSK flashlight projection gained on first analyzer, 4 optical directions to first Polarization Controller 1 and second Polarization Controller 3; Make second tunable differential group delay device 6 fast axle (F) 10-Gbaud/s 16-QAM flashlights, two 10-Gbaud/s 16-QAM flashlight its light field amplitudes identical differ 6dB (luminous power differs 12dB) through adjusting with the polarization direction of slow axis (S) 10-Gbaud/s 16-QAM flashlight projection gained on second analyzer, 8 optical directions to the 3rd Polarization Controller 5 and the 4th Polarization Controller 7.
Device according to the invention can be used as independently 16-QAM flashlight generation device or 256-QAM flashlight generation device, and following mask body describes.
As shown in Figure 2, utilize the vector addition of two relevant QPSK flashlights can obtain the 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 by the tunable differential group delay device of first Polarization Controller 1, first 2, second Polarization Controller 3 and first analyzer 4 successively.First Polarization Controller, 1 input QPSK flashlight; Make identical its light field amplitude of two QPSK flashlights in polarization direction of win tunable differential group delay device 2 fast axle (F) QPSK flashlights and slow axis (S) QPSK flashlight projection gained on first analyzer, 4 optical directions differ 3dB (luminous power differs 6dB) through the adjusting to first Polarization Controller 1 and second Polarization Controller 3, both are through relevant vector addition output 16-QAM flashlights behind first analyzer 4.
As shown in Figure 4, utilize the vector addition of two relevant 16-QAM flashlights can obtain the 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 by the tunable differential group delay device of first Polarization Controller 1, first 2, second Polarization Controller 3 and first analyzer 4 successively.First Polarization Controller, 1 input 16-QAM flashlight; Make identical its light field amplitude of two 16-QAM flashlights in polarization direction of win tunable differential group delay device 2 fast axle (F) 16-QAM flashlights and slow axis (S) 16-QAM flashlight projection gained on first analyzer, 4 optical directions differ 6dB (luminous power differs 12dB) through the adjusting to first Polarization Controller 1 and second Polarization Controller 3, both are through relevant vector addition output 256-QAM flashlights behind first analyzer 4.
Illustrated the planisphere of the 10-Gbaud/s 16-QAM flashlight that embodiment produces like Fig. 6.
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 embodiment of 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 the present invention's protection.
Claims (6)
1. the production method of a quadrature amplitude modulation signal light produces the 16-QAM flashlight when being input as the QPSK flashlight, when being input as the 16-QAM flashlight, produces the 256-QAM flashlight, and its production process is:
Regulate the input signal polarization state of light; Make it on the fast axle of tunable differential group delay device and slow axis, be projected as the flashlight of two polarization state quadratures; Between the flashlight of these two polarized orthogonals, introduce the group delay time difference during through tunable differential group delay device; The group delay extent is a positive integer flashlight code-element period and half the less than flashlight code element total length; Then, the flashlight of two polarized orthogonals is carrying out projection through after the Polarization Control on arbitrary optical direction, and two identical flashlights of the polarization direction of the corresponding gained of projection obtain corresponding quadrature amplitude modulation signal light through relevant vector addition on said optical direction;
Polarization is regulated and control through carrying out in the front and back of tunable differential group delay device; When being input as the QPSK flashlight; Identical its light field amplitude of two QPSK flashlights in the polarization direction of projection gained differs 3dB on said optical direction, and both produce the 16-QAM flashlight through relevant vector addition on said optical direction; When being input as the 16-QAM flashlight, identical its light field amplitude of two 16-QAM flashlights in the polarization direction of projection gained differs 6dB on said optical direction, and both produce the 256-QAM flashlight through relevant vector addition on said optical direction.
2. the production method of quadrature amplitude modulation signal light according to claim 1; It is characterized in that; When being input as the QPSK flashlight, the 16-QAM flashlight of exporting as new input signal light, is repeated described production process and further exports the 256-QAM flashlight.
3. the generation device of a quadrature amplitude modulation signal light, it is characterized in that: this device comprises first Polarization Controller, the first tunable differential group delay device, second Polarization Controller and first analyzer; The input port of first Polarization Controller; Be used to receive QPSK or 16-QAM flashlight; The output port of first Polarization Controller is connected with the input port of second Polarization Controller with first analyzer through the first tunable differential group delay device successively, and the output port of first analyzer is used for corresponding output 16-QAM or 256-QAM flashlight;
The group delay time difference of introducing between fast axle of the first tunable differential group delay device and the slow axis is a positive integer flashlight code-element period and less than half of flashlight code element total length;
When the input port of first Polarization Controller receives the QPSK flashlight; Make tunable differential group delay device fast axle QPSK flashlight two QPSK flashlights its light field amplitude identical with the polarization direction of slow axis QPSK flashlight projection gained on the first analyzer optical direction of winning differ 3dB through the adjusting to first Polarization Controller and second Polarization Controller, both export the 16-QAM flashlight through relevant vector addition at the output port of first analyzer;
When the input port of first Polarization Controller receives the 16-QAM flashlight; Make tunable differential group delay device fast axle 16-QAM flashlight two 16-QAM flashlights its light field amplitude identical with the polarization direction of slow axis 16-QAM flashlight projection gained on the first analyzer optical direction of winning differ 6dB through the adjusting to first Polarization Controller and second Polarization Controller, both export the 256-QAM flashlight through relevant vector addition at the output port of first analyzer.
4. generation device according to claim 3 is characterized in that: first Polarization Controller is used to receive the QPSK flashlight, and this device also comprises the 3rd Polarization Controller, the second tunable differential group delay device, the 4th Polarization Controller and second analyzer; The input port of the 3rd Polarization Controller is connected with the output port of first analyzer; The output port of the 3rd Polarization Controller is connected with the input port of second analyzer through the second tunable differential group delay device, the 4th Polarization Controller successively, and the output port of second analyzer is used to export the 256-QAM flashlight;
The group delay time difference of introducing between fast axle of the second tunable differential group delay device and the slow axis is a positive integer flashlight code-element period and less than half of flashlight code element total length; Make the second tunable differential group delay device fast axle 16-QAM flashlight, two 16-QAM flashlights its light field amplitude identical differ 6dB through adjusting with the polarization direction of slow axis 16-QAM flashlight projection gained on the second analyzer optical direction to the 3rd Polarization Controller and the 4th Polarization Controller.
5. according to claim 3 or 4 described generation devices, it is characterized in that: the said first tunable differential group delay device is the device that polarization mode dispersion emulating instrument or polarization maintaining optical fibre etc. have birefringent characteristic.
6. generation device according to claim 4 is characterized in that: the said second tunable differential group delay device is the device that polarization mode dispersion emulating instrument or polarization maintaining optical fibre etc. have birefringent characteristic.
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| WO2016184235A1 (en) * | 2015-05-15 | 2016-11-24 | 中兴通讯股份有限公司 | Phase ambiguity processing method and device for quadrature amplitude modulation signal |
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