CN113644978A - 25G optical module OAM modulation circuit - Google Patents
25G optical module OAM modulation circuit Download PDFInfo
- Publication number
- CN113644978A CN113644978A CN202111056291.2A CN202111056291A CN113644978A CN 113644978 A CN113644978 A CN 113644978A CN 202111056291 A CN202111056291 A CN 202111056291A CN 113644978 A CN113644978 A CN 113644978A
- Authority
- CN
- China
- Prior art keywords
- signal
- mcu
- oam
- oam modulation
- operational amplifier
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/25—Arrangements specific to fibre transmission
- H04B10/2575—Radio-over-fibre, e.g. radio frequency signal modulated onto an optical carrier
- H04B10/25752—Optical arrangements for wireless networks
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/516—Details of coding or modulation
- H04B10/5161—Combination of different modulation schemes
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Semiconductor Lasers (AREA)
- Optical Communication System (AREA)
Abstract
The invention discloses an OAM modulation circuit of a 25G optical module, and a modulation method thereof comprises the following steps: s1, firstly, connecting the MCU module, the operational amplifier, the laser, the capacitor and the TIA together in real time through signal transmission wires, connecting the laser and the TIA connecting port into a circuit needing to be modulated in real time through a signal input end and a model output end, starting the MCU to realize Manchester coding of an OAM modulation signal through programming, converting the OAM modulation signal into analog quantity through a D/A digital-analog of the MCU, and programming and adjusting the analog quantity through software; s2 and then converted to current coupling into the laser via the operational amplifier. After the receiving end converts the optical signal into the electric signal through the sampling resistor, the electric signal is not directly sent to the amplifier, but the direct current component is removed through the blocking capacitor, so that useless direct current signals are removed, useful OAM modulation signals are amplified, and S3 and finally the OAM modulation signals can be subjected to Manchester decoding by using a self-contained CLU unit in the MCU.
Description
Technical Field
The invention relates to the technical field of optical modules, in particular to an OAM modulation circuit of a 25G optical module.
Background
In recent years, with the rapid advance of 5G construction, a large number of 25G optical modules are applied to a 5G fronthaul network, in order to manage the optical modules and reduce fault location time, china mobile and telecommunications require the 25G optical modules to add an OAM modulation function, where the OAM modulation function is to modulate digital information containing the optical module state into an optical layer signal through manchester coding and demodulate the digital signal from the optical layer signal.
The traditional OAM modulation circuit scheme of the optical module is that the transmitting end of the optical module carries out Manchester coding on the state information of the optical module acquired by the MCU through an FPGA, the state information is converted into current through an operational amplifier and coupled into a laser, the current is transmitted to the receiving end of the optical module through an optical fiber, the receiving end converts an optical signal into an electric signal through a sampling resistor, and the electric signal is amplified by the amplifier and then carries out Manchester decoding on the electric signal for the FPGA. The traditional OAM modulation circuit of the optical module needs an independent FPGA to carry out Manchester coding and decoding, the realization cost is high, the modulation current is not adjustable, only the modulation signal of the optical power in a specific interval can be decoded, the limitation is very large, a receiving end converts the optical signal into an electric signal through a sampling resistor and then directly sends the electric signal to an operational amplifier, and the useful OAM modulation signal is not screened out, so that the amplification factor is influenced by direct current light, and the OAM modulation optical signal with any size cannot be decoded.
Disclosure of Invention
The invention aims to provide a 25G optical module OAM modulation circuit, which solves the problems that the traditional optical module OAM modulation circuit proposed in the background art needs an independent FPGA for Manchester coding and decoding, the realization cost is high, the modulation current is not adjustable, only the modulation signal of the optical power in a specific interval can be decoded, the limitation is high, a receiving end converts an optical signal into an electric signal through a sampling resistor and then directly supplies the electric signal to an operational amplifier, and the useful OAM modulation signal is not screened out, so that the amplification factor is influenced by direct current light, and the OAM modulation optical signal with any size cannot be decoded.
In order to achieve the purpose, the invention provides the following technical scheme: A25G optical module OAM modulation circuit, its modulation method includes the following steps:
s1, firstly, connecting the MCU module, the operational amplifier, the laser, the capacitor and the TIA together in real time through signal transmission wires, connecting the laser and the TIA connecting port into a circuit needing to be modulated in real time through a signal input end and a model output end, starting the MCU to realize Manchester coding of an OAM modulation signal through programming, converting the OAM modulation signal into analog quantity through a D/A digital-analog of the MCU, and programming and adjusting the analog quantity through software.
S2 and then converted to current coupling into the laser via the operational amplifier. After the receiving end converts the optical signal into the electric signal through the sampling resistor, the electric signal is not directly sent to the amplifier, but the direct current component is removed through the direct current blocking capacitor, so that useless direct current signals are removed, and useful OAM modulation signals are amplified.
S3, finally, the OAM modulation signal can realize Manchester decoding by using a CLU unit in the MCU, and the scheme can decode modulated optical signals of any size, namely, the problem that the traditional scheme can only decode modulated signals of optical power in a specific interval is solved, the on-line adjustment of the modulation current is realized, and the later-stage debugging is convenient.
Preferably, the number of the operational amplifiers is two, and the models of the operational amplifiers are SGM8605-1 and SGM8558-1 respectively.
Preferably, the MCU module is packaged into 32pin QFN, and the inside of the MCU module contains 64Kb Flash and is integrated with a CLU logic gate.
Preferably, one end of each of the SGM8605-1 and SGM8558-1 operational amplifiers is connected to the MCU module through a signal transmission wire, and the other end of each of the SGM8605-1 and SGM8558-1 operational amplifiers is connected to the laser and the capacitor through a signal transmission wire.
Compared with the prior art, the invention has the beneficial effects that:
the invention realizes the Manchester coding and decoding of the OAM modulation signal through the MCU, has lower cost than the conventional FPGA scheme, adopts the blocking capacitor to finish the alternating current amplification of the OAM modulation signal, has larger amplification factor than the direct amplification of the modulation signal, has good signal quality, adopts the DAC unit in the MCU to output the OAM modulation signal, can change the power of the modulation optical signal by adjusting the output voltage of the DAC, is convenient for the later debugging of the product, and improves the product development efficiency.
Drawings
Fig. 1 is a schematic diagram of an OAM modulation circuit of a 25G optical module according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, a 25G optical module OAM modulation circuit, its modulation method includes the following steps:
s1, firstly, the MCU module, the operational amplifier, the laser, the capacitor and the TIA are connected together in real time through signal transmission wires, the connection ports of the laser and the TIA are connected to a circuit needing to be modulated in real time through a signal input end and a model output end, the MCU is started to realize Manchester coding of the OAM modulation signal through programming, the Manchester coding of the OAM modulation signal is converted into analog quantity through the D/A digital-analog of the MCU, the analog quantity can be adjusted through software programming, the Manchester coding of the OAM modulation signal is realized by the MCU in the optical module, the modulation signal is finally generated by the DAC in the MCU, and the on-line adjustment can be realized through software programming.
S2 and then converted to current coupling into the laser via the operational amplifier. After the receiving end converts the optical signal into an electric signal through the sampling resistor, the electric signal is not directly sent to the amplifier, but the direct current component is removed through the blocking capacitor, so that useless direct current signals are removed, useful OAM modulation signals are amplified, the OAM modulation signals are subjected to Manchester coding by the MCU and then are output to the operation amplifier SGM8605-1 through the DAC, and the optical signal is converted into the optical signal after being amplified and connected to the laser and is sent to the optical fiber; the received optical signal is converted into an electric signal RSSI through TIA, a direct current component is removed through a capacitor, an alternating current component of the received optical signal is amplified through an operational amplifier SGM8558-1 and then is sent to an internal comparator port of the MCU to be converted into a digital level, and the digital level is output to a CLU unit to be subjected to Manchester decoding.
S3, finally, the OAM modulation signal can realize Manchester decoding by using a self-contained CLU unit in the MCU, the scheme can decode the modulation optical signal with any size, namely, the problem that the traditional scheme can only decode the modulation signal of the optical power in a specific interval is solved, the on-line adjustment of the modulation current is realized, the later-stage debugging is convenient, the OAM modulation signal is realized by using the MCU with the CLU unit to replace the hardware coding and decoding mode of the FPGA, the circuit is simple to realize, the design is flexible, and the price is low.
In this embodiment: the number of the operational amplifiers is two, and the models of the operational amplifiers are SGM8605-1 and SGM8558-1 respectively.
In this embodiment: the MCU module is packaged into 32pin QFN, 64Kb Flash is contained in the MCU module, a CLU logic gate is integrated and used for Manchester encoding and decoding of OAM modulation signals, and the SGM8605-1 is amplified by adopting a single-channel Saint Pont micro operational amplifier to enhance the driving capability of the modulation signals so as to be coupled to a laser for output.
In this embodiment: one end of each of the SGM8605-1 operational amplifier and the SGM8558-1 operational amplifier is connected with the MCU module through a signal transmission wire, the other end of each of the SGM8605-1 operational amplifier and the SGM8558-1 operational amplifier is connected with the laser and the capacitor through the signal transmission wire, and a receiving end circuit is designed as follows: the TIA converts the received optical signals into electric signals, the electric signals are connected to a high-precision operational amplifier SGM8558-1 for amplification after the direct current level of the electric signals is removed through a capacitor, then the electric signals are converted into 3.3V logic level digital signals through an EFM8LB12 internal comparator, the digital signals are input to a CLU unit for logic operation, and the modulation signals are restored.
It is 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, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (4)
1. A25G optical module OAM modulation circuit is characterized in that: the modulation method comprises the following steps:
s1, firstly, connecting the MCU module, the operational amplifier, the laser, the capacitor and the TIA together in real time through signal transmission wires, connecting the laser and the TIA connecting port into a circuit needing to be modulated in real time through a signal input end and a model output end, starting the MCU to realize Manchester coding of an OAM modulation signal through programming, converting the OAM modulation signal into analog quantity through a D/A digital-analog of the MCU, and programming and adjusting the analog quantity through software;
s2 and then converted to current coupling into the laser via the operational amplifier. After the receiving end converts the optical signal into an electric signal through the sampling resistor, the electric signal is not directly sent to the amplifier, but the direct current component is removed through the blocking capacitor, so that useless direct current signals are removed, and useful OAM modulation signals are amplified;
s3, finally, the OAM modulation signal can realize Manchester decoding by using a CLU unit in the MCU, and the scheme can decode modulated optical signals of any size, namely, the problem that the traditional scheme can only decode modulated signals of optical power in a specific interval is solved, the on-line adjustment of the modulation current is realized, and the later-stage debugging is convenient.
2. The OAM modulation circuit of claim 1, wherein: the number of the operational amplifiers is two, and the models of the operational amplifiers are SGM8605-1 and SGM8558-1 respectively.
3. The OAM modulation circuit of claim 1, wherein: the MCU module is packaged into 32pin QFN, and the inside of the MCU module contains 64Kb Flash and is integrated with a CLU logic gate.
4. The OAM modulation circuit of claim 1, wherein: one end of each of the SGM8605-1 operational amplifier and the SGM8558-1 operational amplifier is connected with the MCU module through a signal transmission lead, and the other end of each of the SGM8605-1 operational amplifier and the SGM8558-1 operational amplifier is connected with the laser and the capacitor through the signal transmission lead.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111056291.2A CN113644978A (en) | 2021-09-09 | 2021-09-09 | 25G optical module OAM modulation circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111056291.2A CN113644978A (en) | 2021-09-09 | 2021-09-09 | 25G optical module OAM modulation circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113644978A true CN113644978A (en) | 2021-11-12 |
Family
ID=78425481
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111056291.2A Pending CN113644978A (en) | 2021-09-09 | 2021-09-09 | 25G optical module OAM modulation circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113644978A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110730040A (en) * | 2019-11-19 | 2020-01-24 | 杭州芯耘光电科技有限公司 | Low-speed communication method supporting wide dynamic receiving optical power range and optical module |
| CN112437360A (en) * | 2020-11-20 | 2021-03-02 | 福建中科光芯光电科技有限公司 | Method for realizing top-adjusting function through backlight |
| CN112601142A (en) * | 2021-03-01 | 2021-04-02 | 深圳市迅特通信技术股份有限公司 | Processing circuit of OAM signal in optical module receiving end and optical module |
| CN112787726A (en) * | 2021-02-24 | 2021-05-11 | 东莞铭普光磁股份有限公司 | Optical module with service management function |
| CN112969111A (en) * | 2021-05-17 | 2021-06-15 | 深圳市迅特通信技术股份有限公司 | OAM demodulation circuit for optical module and optical module |
-
2021
- 2021-09-09 CN CN202111056291.2A patent/CN113644978A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110730040A (en) * | 2019-11-19 | 2020-01-24 | 杭州芯耘光电科技有限公司 | Low-speed communication method supporting wide dynamic receiving optical power range and optical module |
| CN112437360A (en) * | 2020-11-20 | 2021-03-02 | 福建中科光芯光电科技有限公司 | Method for realizing top-adjusting function through backlight |
| CN112787726A (en) * | 2021-02-24 | 2021-05-11 | 东莞铭普光磁股份有限公司 | Optical module with service management function |
| CN112601142A (en) * | 2021-03-01 | 2021-04-02 | 深圳市迅特通信技术股份有限公司 | Processing circuit of OAM signal in optical module receiving end and optical module |
| CN112969111A (en) * | 2021-05-17 | 2021-06-15 | 深圳市迅特通信技术股份有限公司 | OAM demodulation circuit for optical module and optical module |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN1040492C (en) | Optical transmission system for digital communication along a light beam waveguide having dispersion at the operating wavelength | |
| CN113541800B (en) | Communication method between base station and terminal and corresponding communication system | |
| CN103490815A (en) | Payment method based on visible light, middle equipment and intelligent terminal and system | |
| CN103957056A (en) | Visible light communication system compatible with intelligent cell phone | |
| CN201365320Y (en) | Digital video optical transmitter and receiver | |
| CN101383786B (en) | Method for implementing data interchange between optical network terminal and customer terminal using household gateway | |
| CN103347184A (en) | Digitization transmission system based on FPGA | |
| CN113644978A (en) | 25G optical module OAM modulation circuit | |
| CN201830410U (en) | Passive optical network (PON) terminal | |
| CN111082867A (en) | Single-light-source two-way communication system based on visible light communication and power line transmission | |
| CN203301660U (en) | FPGA-based real-time digital optical fiber transmission system | |
| CN209981639U (en) | USB long-distance transmission system | |
| CN203313190U (en) | Portable intelligent optical fiber tester | |
| CN220043587U (en) | MWDM optical signal transmission device applied to 5G network | |
| CN209401035U (en) | Cable information reading device and system | |
| CN116667922B (en) | Bidirectional communication method of optical communication comprehensive test equipment | |
| CN111082875A (en) | Laser communication device and method | |
| CN208739326U (en) | Communicate full-service light distribution system signal transmitting device | |
| CN201285432Y (en) | Magnetic field current uploading apparatus for electricity generator | |
| CN116545475B (en) | Method and system for optimizing power carrier signal indicated by optical signal | |
| CN2904383Y (en) | High voltage frequency changer passive RS 232 optical fiber signal converter | |
| CN205610645U (en) | LED communication and lighting system based on FPGA | |
| CN109495708A (en) | A kind of disease-resistant state code SDI vision signal optical fiber transmission method | |
| CN216930023U (en) | Subminiature optical fiber transceiver | |
| CN211293366U (en) | Mode conversion equipment for single-mode optical fiber and multimode optical fiber |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20211112 |