CN212909542U

CN212909542U - Signal modulation equipment

Info

Publication number: CN212909542U
Application number: CN202022473483.0U
Authority: CN
Inventors: 胡灵欢; 黄耀; 邓鸿胜; 曹露芳
Original assignee: Taizhou Vocational College of Science and Technology
Current assignee: Zhejiang Dingye Network Communication Technology Co ltd
Priority date: 2020-10-30
Filing date: 2020-10-30
Publication date: 2021-04-06
Anticipated expiration: 2030-10-30

Abstract

The utility model relates to a signal modulation device, which comprises a receiver, a processor, a continuous wave light source transmitter, a signal modulator and a separator; after the receiver receives an input signal through the input end, two output ends are respectively connected with the processor and the signal modulator; three input ends of the processor are respectively connected with the receiver and the two clock signal generators, and the output end of the processor is connected with the signal modulator; three input ends of the signal modulator are respectively arranged on the receiver, the processor and the continuous wave light source emitter, and the generated light signals are transmitted to the separator through optical fibers; the light signals are received by a separator, divided into two groups of signals and respectively connected with two photosensitive diodes through the output end of the separator. The utility model discloses the modulation number of times only is once, and need not decode, has reduced the interference between label signal and the payload, and the stack of two kinds of signals can not reduce the extinction ratio of payload signal, has improved the expansibility of network.

Description

Signal modulation equipment

Technical Field

The utility model relates to a modulation equipment, specifically speaking are signal modulation equipment.

Background

With the improvement of information technology and the improvement of the living standard of people, the requirements of people on the performance of the network are higher and higher. Due to the wide application of multimedia technology, the requirements of people on high-definition video, high-quality data transmission and ultra-large-capacity storage space are continuously increased, which makes the network performance greatly challenged. Due to the speed limitation in the field of circuit reduction, optical switching technology is gradually entering the research field of people due to its excellent performance. All-optical packet switching is an ideal solution, but because research and application in optical storage, optical logic devices and other related key aspects are not mature, people focus on the optical label switching technology which is easier to realize. The core of the optical label switching technology is to mix a low-rate label signal and a high-rate payload signal, and separate reception is realized at a switching node by using the electric domain technology and the optical domain technology respectively. In recent years, optical label switching technology has been studied as an optimally desirable solution for optical packet switching.

Conventional quadrature modulation schemes often involve two separate modulation formats, and the optical power loss is severe as the emitted light passes through the modulator twice.

For example, chinese patent CN102893568 discloses a signal modulation device, which includes a receiver, a transposer and a signal modulator, wherein a first input signal and a second input signal are received by the receiver, the first input signal and the second input signal have the same phase, the transposer is used to transpose the first input signal, so that the phase difference between the generated third input signal and the first input signal is an odd multiple of pi, and CAP modulation (carrierless amplitude phase modulation) is performed respectively; because the input signals have odd-number times of phase difference of pi, envelope signals of the two demodulated signals obtained by demodulation are separated, and intersymbol interference of the two demodulated signals obtained by demodulation at non-sampling points is reduced. However, this device still needs to modulate both input signals separately, and the interference between the tag signal and the payload is still large.

In order to reduce the interference between the tag signal and the payload, it is necessary to develop a device that performs pseudo-orthogonal modulation based on the electrical domain only once.

SUMMERY OF THE UTILITY MODEL

In view of the above, the present application provides the following technical solutions to achieve the above objects.

A signal modulation apparatus comprising: a receiver, a processor, a continuous wave light source transmitter, a signal modulator and a separator.

The receiver is provided with two input ends and two output ends, the input ends are connected with an external signal generator, one of the output ends is connected with the signal modulator, and the other output end is connected with the processor;

the processor is provided with three input ends and an output end, the input ends are respectively connected with the receiver and the two clock signal generators, and the output end is connected with the signal modulator;

the signal modulator is provided with two input ends and an output end, wherein one input end is connected with the receiver, the other input end is connected with the processor, and the output end is connected with the separator;

the separator is provided with an input end and two signal output ends, and the input end is connected with the signal modulator.

Preferably, the processor comprises a nand gate and an xor gate, and receives various clock signals, and after receiving the input signal from the receiver, the processor is connected with a 50% duty cycle clock signal, the nand gate generates a signal and a 25% duty cycle clock signal, and the xor gate generates an output signal and is connected with the signal modulator.

Preferably, two PDs (light sensitive diodes) are further provided behind the splitter, and are respectively connected to the two signal output terminals of the splitter.

Preferably, the signal modulator transmits the optical signal to the splitter through an optical fiber.

Preferably, the optical fiber is a single-mode optical fiber, and a dispersion compensation fiber and an erbium-doped fiber amplifier are further arranged at the tail of the single-mode optical fiber.

The utility model discloses the beneficial effect who obtains:

1) the utility model has simple structure, convenient operation, only one light source emitter and the internal circuit structure design of the signal modulator, so that the modulation frequency of the modulator is only 1 time;

2) the internal circuit structure design of the processor and the connection design of only once signal modulator modulation ensure that the output signal does not need decoding, and the interference between the label signal and the effective load is reduced;

3) the single mode fiber is also provided with a dispersion compensation fiber and an erbium-doped fiber amplifier for compensating the dispersion of the single mode fiber.

The foregoing description is only an overview of the technical solutions of the present application, so that the technical means of the present application can be more clearly understood and the present application can be implemented according to the content of the description, and in order to make the above and other objects, features and advantages of the present application more clearly understood, the following detailed description is made with reference to the preferred embodiments of the present application and the accompanying drawings.

The above and other objects, advantages and features of the present application will become more apparent to those skilled in the art from the following detailed description of specific embodiments thereof, taken in conjunction with the accompanying drawings.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts. Throughout the drawings, like elements or portions are generally identified by like reference numerals. In the drawings, elements or portions are not necessarily drawn to scale.

FIG. 1 is a schematic diagram of a signal modulation device in one embodiment of the present disclosure;

fig. 2 is a circuit diagram of a processor in a signal modulation device according to an embodiment of the present disclosure.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. In the following description, specific details such as specific configurations and components are provided only to help the embodiments of the present application be fully understood. Accordingly, it will be apparent to those skilled in the art that various changes and modifications may be made to the embodiments described herein without departing from the scope and spirit of the present application. In addition, descriptions of well-known functions and constructions are omitted in the embodiments for clarity and conciseness.

It should be appreciated that reference throughout this specification to "one embodiment" or "the embodiment" means that a particular feature, structure or characteristic described in connection with the embodiment is included in at least one embodiment of the present application. Thus, the appearances of the phrase "one embodiment" or "the present embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

Further, the present application may repeat reference numerals and/or letters in the various examples. This repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed.

The term "and/or" herein is merely an association describing an associated object, meaning that three relationships may exist, e.g., a and/or B, may mean: a exists alone, B exists alone, and A and B exist at the same time, and the term "/and" is used herein to describe another association object relationship, which means that two relationships may exist, for example, A/and B, may mean: a alone, and both a and B alone, and further, the character "/" in this document generally means that the former and latter associated objects are in an "or" relationship.

The term "at least one" herein is merely an association relationship describing an associated object, and means that there may be three relationships, for example, at least one of a and B, may mean: a exists alone, A and B exist simultaneously, and B exists alone.

It is further noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion.

Example 1

This embodiment describes the structure of the signal modulation apparatus in detail.

Referring to fig. 1, fig. 1 is a block diagram of a signal modulation apparatus, which shows the signal modulation apparatus in the present embodiment, and includes a receiver, a processor, a signal modulator, a continuous wave light source emitter, and a separator.

The receiver in this embodiment receives a first input signal and a second input signal, transmits the first input signal to the processor, and transmits the second input signal to the signal modulator. The first input signal comprises an NRZ (non return to zero code) signal and the second input signal comprises an NRZ encoded signal and a PAM4 (fourth generation pulse amplitude modulation) signal.

Referring to fig. 2, the second input signal is an NRZ encoded signal, and the NRZ encoded signal and the 50% clock duty cycle clock signal pass through the nand gate to form an IRZ (inverse return to zero code) encoded signal, i.e., a third input signal, and the 25% clock duty cycle clock signal pass through the xor gate to form an IRZ-Manchester encoded signal, i.e., a fourth input signal.

The continuous wave light source emitter generates an optical signal which is transmitted to the signal modulator.

The signal modulator in the present embodiment is an MZM modulator (mach-zehnder modulator).

In the signal modulator in this embodiment, after receiving the fourth input signal and the second input signal, the fourth input signal and the second input signal are modulated onto an optical carrier by the MZM modulator and transmitted to the splitter by the optical fiber, where the optical fiber is a single-mode optical fiber, and a dispersion compensation fiber and an erbium-doped fiber amplifier are further disposed behind the single-mode optical fiber.

The splitter of this embodiment receives the optical signal and splits it into a first output signal and a second output signal, and the PD receives the optical signal and performs high-speed and low-speed signal restoration, respectively.

Example 2

Based on the above embodiment 1, this embodiment describes the operation steps of the present invention in detail.

1. And carrying out electric domain processing on the effective load signal to generate an IRZ-Manchester coding signal.

2. The generated IRZ-Manchester coded signal and the label signal are superposed and modulated onto an optical carrier wave through an MZM modulator.

3. The signal is transmitted on an optical carrier and transmitted to the splitter via an optical fiber.

The first step is that on a processor, an NRZ coding signal and a 50% duty cycle clock signal pass through a NAND gate to obtain an IRZ coding signal, and the IRZ coding signal and a 25% duty cycle clock signal pass through an XOR gate to obtain an IRZ-Manchester coding signal.

And the second step is to superpose the IRZ-Manchester coding signal and a second input signal, namely a label signal, and then modulate the signals on an optical carrier through the MZM modulator.

The third step is that the separator divides the signal into two paths, and the PD receives the signals and then carries out high-speed reduction and low-speed reduction respectively.

The above description is only a preferred embodiment of the present invention, and it is not intended to limit the scope of the present invention, and various modifications and changes may be made by those skilled in the art. All changes, modifications, substitutions, integrations and parameter changes to the embodiments, which are within the spirit and principle of the invention, can be made by conventional substitution or can realize the same function without departing from the principle and spirit of the invention, and all fall into the protection scope of the invention.

Claims

1. A signal modulation device is characterized by comprising a receiver, a processor, a continuous wave light source transmitter, a signal modulator and a separator;

the signal modulator is provided with three input ends and an output end, wherein one input end is connected with the receiver, the other input end is connected with the processor, the other input end is connected with the continuous wave light source emitter, and the output end is connected with the separator;

2. The signal conditioning device of claim 1, wherein the processor comprises a nand gate and an xor gate and receives a plurality of clock signals, and wherein the processor receives the input signal from the receiver and couples the input signal to the signal conditioner via the nand gate with a 50% duty cycle clock signal and the nand gate to generate the output signal via the xor gate with a 25% duty cycle clock signal.

3. The signal modulation apparatus according to claim 1, wherein two PDs are further provided after the splitter, and are connected to two signal output terminals of the splitter, respectively.

4. The signal modulation apparatus of claim 1, wherein the signal modulator transmits the optical signal to the splitter via an optical fiber.

5. The signal modulation device according to claim 4, wherein the optical fiber is a single mode optical fiber, and a dispersion compensation fiber and an erbium-doped fiber amplifier are further disposed at a tail portion of the single mode optical fiber.