WO2012163008A1

WO2012163008A1 - Signal modulation device and modulation method

Info

Publication number: WO2012163008A1
Application number: PCT/CN2011/080880
Authority: WO
Inventors: 刘磊; 李良川; 毛邦宁
Original assignee: 华为技术有限公司
Priority date: 2011-10-18
Filing date: 2011-10-18
Publication date: 2012-12-06
Also published as: CN102439887A; CN102439887B

Abstract

The present invention provides a signal modulation device and modulation method. The device comprises an initial modulator and an analyzer. A signal output interface of the initial modulator is connected to a signal input interface of the analyzer. The initial modulator is used for generating a first code type signal. The first code type signal comprises a first polarization state signal and a second polarization state signal. The analyzer is used for, when communicated with the initial modulator, adjusting a ratio of power projection of the first polarization state signal and the second polarization state signal in the first code type signal in an analysis direction, to output a second code type signal corresponding to the ratio. In the signal modulation device and modulation method provided by the present invention, the initial modulator and the analyzer which are connected and match with each other are disposed to enable switching between different code type modulation formats, thereby realizing optimization of link performance.

Description

Signal modulation device and modulation method

TECHNICAL FIELD The present invention relates to optical network technologies, and in particular, to a signal modulation apparatus and a modulation method. Background technique

At present, the optical network can modulate the signal and transmit it in the backbone network through a modulator of various signal modulation formats. Signal modulation formats commonly used in the prior art may include, for example, Quadrature Amplitude Modulation (16QAM) modulator, Differential Quadrature Phase Shift Keying (DQPSK) modulation. , Binary Phase Shift Keying (BPSK) modulator, etc. The modulator can split the input signal according to a certain power ratio, perform photoelectric conversion, map the electric bit sequence data signal to each phase of the optical carrier, superimpose each split light according to a preset phase, and output a corresponding modulated signal.

However, the technical defect of the above signal modulation is that the current modulator can only generate one type of modulated signal, for example, the 16QAM modulator can only generate 16QAM signals, the DQPSK modulator can only generate DQPSK signals, etc.; The transmission performance is constantly changing, and the corresponding signal modulation format also has different requirements. For example, when the link transmission performance is poor, a low-order modulation signal can be used, and when the link transmission performance is excellent, a high-order modulation signal can be used. Still only low-order modulation signals can be generated, which will obviously affect the performance of the link. Summary of the invention

It is an object of the present invention to provide a signal modulating apparatus and a modulating method to implement signals that can generate different modulation formats.

An aspect of the present invention provides a signal modulating apparatus, including: an initial modulator and an analyzer, wherein a signal output interface of the initial modulator is connected to a signal input interface of the analyzer;

The initial modulator is configured to generate a first pattern signal, where the first pattern signal includes a first polarization state signal and a second polarization state signal;

The analyzer is configured to adjust the first pattern signal when communicating with the initial modulator And a ratio of a power projection of the first polarization state signal and the second polarization state signal in a detection direction to output a second pattern signal corresponding to the ratio.

Another aspect of the present invention provides a signal modulation method, including:

Generating, by the initial modulator, a first pattern signal, the first pattern signal comprising a first polarization state signal and a second polarization state signal;

Connecting the analyzer and the initial modulator, and adjusting, by the analyzer, a power projection of the first polarization state signal and the second polarization state signal in a detection direction in the first pattern signal Proportion to output a second pattern signal corresponding to the ratio.

The signal modulating device and the modulating method of the present invention can realize the optimization of the link performance by setting the initial modulator and the analyzer which are connected and matched so as to be switchable between different pattern modulation formats. BRIEF DESCRIPTION OF THE DRAWINGS In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, a brief description of the drawings to be used in the description of the embodiments will be briefly described below. Some embodiments of the present invention may also be used to obtain other drawings based on these drawings without departing from the prior art.

1 is a schematic structural diagram of Embodiment 1 of a signal modulation apparatus according to the present invention;

2 is a schematic structural diagram of Embodiment 2 of a signal modulation apparatus according to the present invention;

3 is a schematic diagram of signal modulation of a second embodiment of a signal modulation apparatus according to the present invention;

4 is a schematic structural diagram of Embodiment 3 of a signal modulation apparatus according to the present invention;

5 is a schematic diagram of signal modulation of a third embodiment of a signal modulation apparatus according to the present invention;

6 is a schematic flow chart of an embodiment of a signal modulation method according to the present invention. detailed description

The technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. Some embodiments, rather than all of the embodiments, are invented. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention. The main technical solution of the present invention is that the signal modulation device of the combined structure of the analyzer is integrated by the initial modulator, so that the initial modulator itself can generate the first pattern signal; and when the analyzer is connected to the initial modulator, The entire signal modulation device can output the second pattern signal, so that the signal modulation device can be applied to different signal modulation formats, so as to facilitate switching between different patterns according to the transmission performance of the link, thereby maximizing link performance.

The technical solution of the present invention will be further described in detail below through the accompanying drawings and specific embodiments. Embodiment 1

1 is a schematic structural diagram of Embodiment 1 of a signal modulating apparatus according to the present invention. As shown in FIG. 1, the signal modulating apparatus of this embodiment may include an initial modulator 11 and an analyzer 12, and the analyzer 12 is of an adjustable angle. An analyzer, the signal input interface of the analyzer 12 is connected to the signal output interface of the initial modulator 11.

The initial modulator 11 can be several modulators that are currently common. For example, polarization multiplexing-multiplexing phase shift keying (RTR-QPSK) modulator, PDM-BPSK modulator, etc.; the working principle of the above modulator is the same as the prior art. They are all conventional modulators, so they will not be described again; the corresponding modulator can generate corresponding modulated signals. For example, PDM-QPSK modulator can generate PDM-QPSK signals, PDM-BPSK modulator can generate PDM-BPSK signals, etc. The generated signal can be referred to as a first pattern signal.

For example, in the process of generating a PDM-QPSK signal by a PDM-QPSK modulator, the optical signal enters the PDM-QPSK modulator and is split into two paths: one is an X-polarized optical signal, and the other is a Y-polarized optical signal. Then, the two optical signals are respectively modulated into two QPSK modulators to obtain two QPSK signals, which are an X-polarized QPSK signal and a Y-polarized QPSK signal; finally, the two QPSK signals are synthesized. , get the PDM-QPSK signal. There may be a certain phase difference between the two QPSK signals. For example, the phase difference between the QPSK signal of the X polarization state and the QPSK optical signal of the Y polarization state may be an integer multiple of 90 degrees.

When the analyzer 12 is in communication with the initial modulator 11, the first pattern signal output by the signal output interface of the initial modulator 11 can enter the analyzer 12 via the signal input interface of the analyzer 12. The first pattern signal includes a first polarization state signal and a second polarization state signal; the analyzer 12 can be configured to adjust the first polarization in the first pattern signal when communicating with the initial modulator 11. The ratio of the power projection of the state signal to the second polarization state signal in the direction of the detection, to output the ratio to the ratio The second pattern signal should be.

It should be noted that the second pattern signal referred to in this embodiment may be changed. For example, when the analyzer is adjusted such that the ratio of the power projection is A, the second pattern signal of the first modulation format is output; when the analyzer is adjusted such that the ratio of the power projection is B, the output is The second pattern signal of the second modulation format.

In this embodiment, by providing the initial modulator 11 and the analyzer 12 that are connected and cooperated, the signal modulation device can be simultaneously compatible with different pattern modulation formats. For example, when the link performance is low, the use of the analyzer 12 can be turned off, and only the first modulator signal is output by the initial modulator 11; when the link performance is high, the analyzer 12 can be activated, so that the analyzer is turned off. The device 12 is in communication with the initial modulator 11 to generate a higher order second pattern signal, thereby enabling switching between different patterns according to link performance, thereby optimizing the performance of the link.

It should be noted that, in this embodiment, the method of using the signal modulation apparatus is not limited. For example, a control switch may be disposed on the analyzer 12 to control the activation or deactivation of the analyzer 12 to achieve communication or disconnection between the analyzer 12 and the initial modulator 11; or, the signal modulation may be performed. The receiving module and the processing module are set on the device, and the transmission performance parameter (for example, an optical signal noise ratio (OSNR)) of the link is obtained by the receiving module, and the transmission performance of the link is processed by the processing module. a parameter, controlling the analyzer to communicate with the initial modulator, and controlling the analyzer to adjust the first polarization state signal and the second polarization state signal in the first pattern signal generated by the initial modulator in detecting The ratio of the power projection of the direction. Those skilled in the art can also set other control methods according to actual needs.

The signal modulating device of this embodiment can switch between different pattern modulation formats by setting an initial modulator and an analyzer that are connected and matched, thereby optimizing link performance.

On the basis of the first embodiment, the following two embodiments and the third embodiment take two specific modulation modes as an example to describe the technical solution of the present invention. The following is an example in which the signal modulation device is compatible with two types of codes. However, in actual use, it is not limited to the following modulators and modulation formats, and is not limited to two types of codes.

Embodiment 2

2 is a schematic structural diagram of Embodiment 2 of a signal modulation apparatus according to the present invention, and FIG. 3 is a schematic diagram of signal modulation of Embodiment 2 of a signal modulation apparatus according to the present invention. In this embodiment, the signal modulation device is compatible with the PDM-QPSK pattern signal and the 16QAM pattern signal, wherein the initial modulator is PDM-QPSK modulator. As shown in FIG. 2, the signal modulation apparatus of this embodiment may include a PDM-QPSK modulator 21 and an analyzer 22.

The PDM-QPSK modulator 21 is a conventional modulator, and may include a laser diode (111), a polarization beam splitter (PBS) 212, and a QPSK modulator. 213 and polarizer beam combiner (abbreviation: PBC) 214 and other devices. The LD 211 is used to generate laser light, the PBS 212 is used to split incident light according to two polarization states of X and Y, and the PBC 214 is used to combine light of two polarization states of X and Y, wherein PDM represents polarization multiplexing. the way.

The optical signal outputted by the optical signal transmitting end LD211 is divided into two paths by the PBS 212, for example, the first optical signal a of the X polarization state and the second optical signal b of the Y polarization state shown in FIG. 2; a and b The optical signals are respectively modulated into two QPSK modulators 213, and the two QPSK modulators 213 can output QPSK signals of two polarization states of X and Y; the second optical signal b of the following is rotated by the phase control device 215. Degree (can also be rotated by 0 degrees), so that the QPSK signals of the two polarization states of X and Y have a preset phase difference of 90 degrees or 0 degrees; finally, the PDM-QPSK signal is synthesized by PBC214, and correspondingly, it can be called The PDM-QPSK signal has the aforementioned preset phase difference, and the PDM-QPSK signal may be referred to as a first pattern signal.

As shown in FIG. 3, after the PDM-QPSK signal outputted by the PDM-QPSK modulator 21, the connected analyzer 22 can adjust the analyzer 22 to achieve a split ratio of 1:4 for the PDM-QPSK signal. That is, the ratio of the power projection of the two-channel QPSK signals in the analyzers in the direction of the analyzer is 1:4 or 4:1, and finally the 16QAM signal is outputted from the analyzer 22, and the 16QAM signal can be It is called the second pattern signal.

The signal modulating device of this embodiment realizes switching of the PDM-QPSK signal to the 16QAM signal by setting the initial modulator and the analyzer connected and matched.

Embodiment 3

4 is a schematic structural diagram of Embodiment 3 of a signal modulation apparatus according to the present invention, and FIG. 5 is a schematic diagram of signal modulation of Embodiment 3 of the signal modulation apparatus of the present invention. In this embodiment, the signal modulation device is compatible with the PDM-BPSK pattern signal and the QPSK pattern signal, wherein the initial modulator is a PDM-BPSK modulator. As shown in FIG. 4, the signal modulation apparatus of this embodiment may include a PDM-BPSK modulator 31 and an analyzer 32.

Wherein, the PDM-BPSK modulator 31 is a conventional modulator and may include an optical signal transmitting end. Devices such as LD311, BPSK modulator 312, PBS314, and PBC315. The LD 311 is used to generate laser light, the PBS 314 is used to split incident light according to X and Y polarization states, and the PBC 315 is used to combine light of two polarization states of X and Y, wherein PDM indicates the manner of polarization combination. .

The optical signal outputted by the optical signal transmitting end LD311 is divided into two paths, including a first optical signal c of the X-polarized state and a second optical signal d of the Y-polarized state. The two optical signals c and d are respectively modulated into two BPSK modulators 312, and the two BPSK modulators 312 can output BPSK signals of two polarization states of X and Y. Then, the lower second optical signal c is rotated by the phase control device 313 by 90 degrees, and finally the PDM-BPSK signal is synthesized by the PBC device; correspondingly, the PDM-BPSK signal can be said to have the preset phase difference of 90 degrees as described above. And the PDM-BPSK signal can be referred to as a first pattern signal.

As shown in FIG. 5, after the PDM-BPSK signal outputted by the PDM-BPSK modulator 31, the connected analyzer 32 can adjust the analyzer 32 to achieve a split ratio of 1:1 for the PDM-BPSK signal. That is, the ratio of the power projection of the two BPSK signals corresponding to the two BPSK modulators 312 in the detection direction of the analyzer is 1:1, and finally the QPSK signal is outputted by the analyzer 32, and the QPSK signal can be called Is the second pattern signal.

The signal modulating device of this embodiment realizes switching of the PDM-BPSK signal to the QPSK signal by setting the initial modulator and the analyzer connected and matched.

Embodiment 4

FIG. 6 is a schematic flowchart of an embodiment of a signal modulation method according to the present invention. The method of this embodiment may be implemented by using a signal modulation apparatus according to any embodiment of the present invention. The method is simply described, and may be specifically described in conjunction with the device embodiment. As shown in Figure 6, the following steps can be included:

Step 601: Generate, by using an initial modulator, a first pattern signal, where the first pattern signal includes a first polarization state signal and a second polarization state signal;

For example, the initial modulator may be a PDM-QPSK modulator, and correspondingly, a PDM-QPSK signal may be generated, the PDM-QPSK signal comprising a QPSK signal of a first polarization state and a QPSK signal of a second polarization state;

Alternatively, the initial modulator may also be a PDM-BPSK modulator, and correspondingly, a PDM-BPSK signal may be generated, the PDM-BPSK signal comprising a BPSK signal of a first polarization state and a BPSK signal of a second polarization state.

Step 602: Connect the analyzer and the initial modulator, and adjust the indicator by the analyzer. a ratio of a power projection of the first polarization state signal and the second polarization state signal in a detection direction in the first pattern signal to output a second pattern signal corresponding to the ratio.

For example, when the initial modulator is a PDM-QPSK modulator, the power projection of the QPSK signal of the first polarization state and the QPSK signal of the second polarization state of the PDM-QPSK signal in the detection direction can be adjusted by the analyzer. The ratio is 1:4 or 4:1 to output a 16QAM signal, and the 16QAM signal is a second pattern signal;

Alternatively, when the initial modulator is a PDM-BPSK modulator, the power projection of the BPSK signal of the first polarization state and the BPSK signal of the second polarization state of the PDM-BPSK signal in the detection direction may be adjusted by the analyzer. The ratio is 1:1 to output a QPSK signal, which is a second pattern signal.

Furthermore, this embodiment does not limit the method of use of the signal modulation apparatus. For example, a control switch can be provided on the analyzer to control the activation or deactivation of the analyzer to achieve communication or disconnection between the analyzer and the initial modulator;

Alternatively, the receiving module and the processing module may be disposed on the signal modulating device; the receiving module obtains the transmission performance parameter of the link, and the processing module controls the analyzer and the device according to the transmission performance parameter of the link. The initial modulator is connected, and adjusts a ratio of a power projection of the first polarization state signal and the second polarization state signal in the first mode signal generated by the initial modulator in the detection direction. Those skilled in the art can also set other control methods according to actual needs.

The signal modulation method of this embodiment can realize the optimization of the link performance by setting the initial modulator and the analyzer which are connected and matched so as to be switchable between different pattern modulation formats.

A person skilled in the art can understand that all or part of the steps of implementing the above method embodiments may be completed by using hardware related to program instructions, and the foregoing program may be stored in a computer readable storage medium, and the program is executed when executed. The foregoing steps include the steps of the foregoing method embodiments; and the foregoing storage medium includes: a medium that can store program codes, such as a ROM, a RAM, a magnetic disk, or an optical disk.

It should be noted that the above embodiments are only for explaining the technical solutions of the present invention, and are not intended to be limiting; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those skilled in the art that: The technical solutions described in the foregoing embodiments are modified, or some of the technical features are equivalently replaced; and the modifications or substitutions do not deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

Claim

A signal modulating device, comprising: an initial modulator and an analyzer, wherein a signal output interface of the initial modulator is connected to a signal input interface of the analyzer;

The analyzer is configured to adjust a power projection of the first polarization state signal and the second polarization state signal in a detection direction in the first pattern signal when communicating with the initial modulator Proportion to output a second pattern signal corresponding to the ratio.

2. The signal modulating apparatus according to claim 1, wherein the initial modulator is a polarization multiplexing-quadrature phase shift keying modulator;

The polarization multiplexing-quadrature phase shift keying modulator is specifically configured to generate a polarization multiplexing-quadrature phase shift keying signal; the first pattern signal is specifically the polarization multiplexing-quadrature phase shift a keying signal comprising a quadrature phase shift keying signal of a first polarization state and a quadrature phase shift keying signal of a second polarization state;

The analyzer is specifically configured to adjust a quadrature phase shift keying signal of a first polarization state and a quadrature phase shift keying signal of a second polarization state in the polarization multiplexing-quadrature phase shift keying signal The power projection ratio of the detection direction is 1:4 or 4:1 to output a quadrature amplitude modulation signal; and the second pattern signal is specifically the quadrature amplitude modulation signal.

3. The signal modulating apparatus according to claim 1, wherein the initial modulator is a polarization multiplexing-two phase phase shift keying modulator;

The polarization multiplexing-two-phase phase shift keying modulator is specifically configured to generate a polarization multiplexing-two phase phase shift keying signal, where the first pattern signal is specifically the polarization multiplexing-two phase phase shift a keying signal comprising a two-phase phase shift keying signal of a first polarization state and a two-phase phase shift keying signal of a second polarization state;

The analyzer is specifically configured to adjust a two-phase phase shift keying signal of the first polarization state and a second phase phase shift keying signal of the second polarization state in the polarization multiplexing-two phase phase shift keying signal The power projection ratio of the detection direction is 1:1 to output a quadrature phase shift keying signal; and the second pattern signal is specifically the quadrature phase shift keying signal.

The signal modulation device according to any one of claims 1 to 3, wherein the analyzer is provided with a control switch;

The control switch is configured to control activation or deactivation of the analyzer to achieve communication or disconnection between the analyzer and the initial modulator.

The signal modulation device according to any one of claims 1 to 3, wherein the signal modulation device is provided with a receiving module and a processing module;

The receiving module is configured to obtain a transmission performance parameter of a link where the signal modulation device is located, where the processing module is configured to control, according to the transmission performance parameter of the link, the analyzer to communicate with the initial modulator, And controlling the analyzer to adjust a ratio of a power projection of the first polarization state signal and the second polarization state signal in the first mode signal generated by the initial modulator in the detection direction.

6. A signal modulation method, comprising:

7. The signal modulation method according to claim 6, wherein:

The generating the first pattern signal is specifically: generating a polarization multiplexing-quadrature phase shift keying signal, where the first pattern signal is specifically the polarization multiplexing-quadrature phase shift keying signal, including a quadrature phase shift keying signal of one polarization state and a quadrature phase shift keying signal of a second polarization state;

And adjusting a ratio of a power projection of the first polarization state signal and the second polarization state signal in a detection direction of the first pattern signal to output a second pattern signal corresponding to the ratio, Specifically: adjusting a quadrature phase shift keying signal of the first polarization state and a quadrature phase shift keying signal of the second polarization state in the polarization multiplexing-quadrature phase shift keying signal in the detecting direction The ratio of power projection is

1 : 4 or 4: 1 to output a quadrature amplitude modulation signal; the second pattern signal is specifically the quadrature amplitude modulation signal.

8. The signal modulation method according to claim 6, wherein:

The generating the first pattern signal is specifically: generating a polarization multiplexing-two phase phase shift keying signal, where the first pattern signal is specifically the polarization multiplexing-two phase phase shift keying signal, including a two-phase phase shift keying signal of one polarization state and a two-phase phase shift keying signal of a second polarization state;

And adjusting a ratio of a power projection of the first polarization state signal and the second polarization state signal in a detection direction of the first pattern signal to output a second pattern signal corresponding to the ratio, Specifically: adjusting two-phase phase shift keying of the first polarization state in the polarization multiplexing-two phase phase shift keying signal The ratio of the power projection of the signal to the second polarization phase of the two-phase phase shift keying signal in the direction of the detection is

1 : 1 , to output a quadrature phase shift keying signal; the second pattern signal is specifically the quadrature phase shift keying signal.

The signal modulation method according to any one of claims 6 to 8, further comprising:

The activation or deactivation of the analyzer is controlled by a control switch provided on the analyzer to achieve communication or disconnection between the analyzer and the initial modulator.

Obtaining a transmission performance parameter of a link where the signal modulation device is located;

Controlling, by the transmission performance parameter of the link, the analyzer to communicate with the initial modulator, and adjusting a first polarization state signal and a second polarization state of the first pattern signal generated by the initial modulator The ratio of the power projection of the signal in the direction of the detection.