CN211720555U - Optical module for transmitting 25G signal by adopting 12.5G optical chip - Google Patents
Optical module for transmitting 25G signal by adopting 12.5G optical chip Download PDFInfo
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- CN211720555U CN211720555U CN202020785103.4U CN202020785103U CN211720555U CN 211720555 U CN211720555 U CN 211720555U CN 202020785103 U CN202020785103 U CN 202020785103U CN 211720555 U CN211720555 U CN 211720555U
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Abstract
The utility model discloses a 12.5G optical chip transmission 25G signal optical module is applied to the optical fiber communication optical network field, for solving the technological obstacle that current 25G signal transmission exists, the utility model discloses a PAM4CDR chip is changed 2 way 12.5G NRZ signals into 1 way 25G PAM4 signal, and the signal bandwidth after the conversion is unchangeable, has guaranteed under the unchangeable condition of chip LDD chip, TIA chip, PD chip and laser instrument bandwidth, realizes adopting 12.5G chip transmission 25G signal, has both saved the cost, has also overcome the problem that 25G signal transmission does not receive the technology abroad of restriction.
Description
Technical Field
The utility model belongs to the optical fiber communication optical network field, in particular to adopt 12.5G optical chip to transmit 25G signal technique.
Background
The optical interconnection has the advantages of high speed, high density, high bandwidth, high interference resistance and the like. At present, more and more systems adopt optical interconnection technology, and the large-scale application is more and more. Due to reasons such as industrial foundation, the high-speed optical chip in China lags behind other countries with high-speed development, which causes that the development of the optical fiber network in China is limited to abroad. The 12.5G optical chip is adopted to transmit 25G signals, so that the current and future optical interconnection needs can be well met.
One of TIA (trans-impedance amplifier) amplifier types, which are defined according to the types of input and output signals thereof. TIAs are commonly used in high-speed circuits, such as optical-electrical transmission communication systems, due to their high bandwidth.
An LD (Laser Diode) semiconductor Laser for converting an electrical signal into an optical signal and transmitting the optical signal through an optical fiber.
An LDD (Laser Diode Driver) semiconductor Laser Driver for modulating the telecommunication signal onto an optical chip to become an optical signal, and transmitting the optical signal through an optical fiber.
NRZ coding (Non-return-to-zero Code) is the most common Code we use, i.e. positive level indicates 1 and low level indicates 0.
PAM4(4Pulse Amplitude Modulation) requires half the bandwidth of NRZ at the same rate, and for most high speed cables, backplanes and connectors, the same nyquist frequency can be achieved at a rate doubled using PAM4 encoding. Comparing NRZ and PAM4 at the same rate, PAM4 uses a four-level modulation scheme to trade off signal-to-noise ratio for half the nyquist frequency.
CTLE (Continuous time linear equalizer), a technology used on a receiving-end chip, is used to effectively improve the eye diagram performance of a receiving end on a link with large transmission loss.
Mux/DeMux signal multiplexers/demultiplexers.
SUMMERY OF THE UTILITY MODEL
In order to solve the problem that the optical chip at present is subject to foreign technology, an optical module for transmitting 25G signals by adopting a 12.5G optical chip is provided, a PAM4CDR chip is adopted, 2 paths of 12.5G NRZ signals are combined into 1 path of 25G PAM4 signals, the signal bandwidth is unchanged, and the purpose of transmitting 25G signals by adopting the 12.5G optical chip is achieved.
The utility model adopts the technical proposal that: A12.5G optical chip transmission 25G signal optical module at least comprises: PAM4CDR chip, PAM4CDR chip convert 2 way 12.5G NRZ signals into 25G PAM4 signals of the same way, this 25G PAM4 signal bandwidth is 12.5G, adopt 12.5G optical chip to transmit this 25G PAM4 signal.
The optical signal conversion device further comprises a laser, and the laser is used for converting 25G PAM4 signals with the bandwidth of 12.5G output by the PAM4CDR chip into optical signals.
A PD detector is also included for converting the 25G PAM4 optical signal to an electrical signal.
The device also comprises a TIA (transimpedance Amplifier) circuit which is used for amplifying the 25G PAM4 electric signal converted by the PD detector and outputting the electric signal to a PAM4CDR chip, and the PAM4CDR chip converts the amplified 25G PAM4 electric signal into a 2-path 12.5G NRZ electric signal and outputs the signal.
The utility model has the advantages that: the utility model discloses an optical module is through adopting PAM4CDR, is transformed into 1 way 25G PAM4 signal with 2 way 12.5G NRZ signals, and the signal bandwidth is unchangeable, guarantees under the unchangeable condition of chip LDD chip, TIA chip, PD chip and laser bandwidth, realizes adopting 12.5G chip transmission 25G signal, has saved the cost, guarantees that 25G signal transmission is not restricted abroad.
Drawings
Fig. 1 is an optical module composed of a 2 × 12.5g NRZ to 1x25G PAM4CDR chip provided by an embodiment of the present invention;
fig. 2 is a 2 × 12.5g NRZ to 1x25G PAM4CDR chip provided by an embodiment of the present invention;
FIG. 3 shows the working principle of the PAM4CDR transmitting end;
fig. 4 shows the operation principle of the PAM4CDR receiving end.
Detailed Description
To facilitate understanding of the technical contents of the present invention by those skilled in the art, the present invention will be further explained with reference to the accompanying drawings.
The problems that in the prior art, domestic 25G optical chips are not mature, a 25G chip with a bandwidth is needed for a common optical module to transmit 25G signals, and if the 25G chip with the bandwidth is adopted to transmit the 25G signals, the cost of the optical module is high and devices are limited are solved. In order to solve the technical problem, the PAM4CDR chip is adopted to realize the effect of transmitting 25G signals by the 12.5G chip; PAM-4CDR is one kind and is converted the equivalent rate PAM4 signal physical layer chip with the NRZ signal, and PAM4CDR chip is shown as figure 2, as shown in figure 1, the utility model discloses an optical module core component includes optical device and electrical part. The function of the optical fiber remote control system is to realize the transmission of information with a certain speed to a remote place through the optical fiber by photoelectric conversion. In fig. 1, Driver is a signal Driver, LDD is a laser Driver, and LD is a laser.
Specifically, the method comprises the following steps: the photoelectric speed of the signals transmitted and received by the ordinary optical module is consistent, and the speed of the input electric signals is the speed of the input electric signals after the input electric signals are converted into optical signals. The utility model discloses an optical module is through adopting PAM4CDR, is transformed into 1 way 25G PAM4 signal with 2 way 12.5G NRZ signals, and the signal bandwidth is unchangeable, guarantees under the unchangeable condition of LDD chip, TIA chip, PD chip and laser instrument bandwidth, realizes adopting 12.5G chip transmission 25G signal, has saved the cost, guarantees that 25G signal transmission is not restricted abroad.
The utility model discloses an adopt 12.5G chip transmission 25G signal optical module, include: PAM4CDR chip, laser instrument, PD detector, TIA, LDD, the utility model discloses an optical module sends and receives two parts including light, mainly utilizes PAM4CDR transmitting terminal and receiving terminal to realize;
as shown in fig. 3, which is a working principle of a PAM4CDR transmitting end, 2 paths of 12.5G NRZ signals respectively output different level signals after passing through different level limiting amplifiers, wherein the amplitude of one path of signal is half of that of the other path of signal; 2 paths of level signals with different amplitudes pass through an electric signal multiplexer to become 1 path of 25G 4 level signals, namely 25G PAM4 signals; and after the 25G PAM4 signal passes through the CDR, the output is driven.
As shown in fig. 4, which is a working principle of a PAM4CDR receiving end, after an eye diagram of a 1-path 25G PAM4 signal is improved by a CTLE (continuous time linear equalizer), the 1-path 25G PAM4 signal is subjected to PAM4CDR processing, is divided into 2-path 12.5G NRZ signals by an electrical signal demultiplexer, and then is output as 2-path 12.5G NRZ signals with consistent signal amplitude by a limiting amplifier and a signal driver.
The utility model discloses an optical module still includes TIA (Tranmperance Amplifier) circuit for the signal of telecommunication after the PD detector conversion is enlargied the back and is exported. An LDD is also included for adding signal modulation to the laser.
It will be appreciated by those of ordinary skill in the art that the embodiments described herein are intended to assist the reader in understanding the principles of the invention, and it is to be understood that the scope of the invention is not limited to such specific statements and embodiments. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.
Claims (6)
1. A12.5G optical chip transmits 25G signal optical module, characterized by at least comprising: PAM4CDR chips;
when a 25G signal is sent, the PAM4CDR chip converts 2 paths of 12.5G NRZ electric signals into a path of 25G PAM4 signals, the bandwidth of the 25G PAM4 signals is 12.5G, and a 12.5G optical chip is adopted to transmit the 25G PAM4 signals;
when a 25G signal is received, one path of the 25G PAM4 signal is divided into 2 paths of 12.5G NRZ signals through a PAM4CDR chip, and the two paths of 12.5G NRZ signals are transmitted by adopting a 12.5G optical chip.
2. The 12.5G optical chip transmission 25G signal optical module as claimed in claim 1, wherein when transmitting 25G signal, the 12.5G optical chip comprises LD laser for converting 25G PAM4 signal with bandwidth of 12.5G outputted from PAM4CDR chip into optical signal output.
3. A 12.5G optical chip transmit 25G signal optical module as claimed in claim 1, wherein when transmitting 25G signal, said 12.5G optical chip further comprises LDD for adding signal modulation to LD laser.
4. A 12.5G optical chip transmission 25G signal optical module according to claim 3, wherein the 2 paths of 12.5G NRZ electrical signals have a half amplitude of one path of 12.5G NRZ electrical signal as the other path of 12.5G NRZ electrical signal.
5. The optical module of claim 1, wherein when receiving 25G signals, the 12.5G optical chip further comprises a PD detector for converting 25G PAM4 optical signals into electrical signals.
6. The 12.5G optical chip optical module of claim 5, wherein when receiving 25G signal, the 12.5G optical chip further comprises a transimpedance amplifier circuit for amplifying the 25G PAM4 electrical signal converted by the PD detector and outputting the amplified signal to the PAM4CDR chip, and the PAM4CDR chip converts the amplified 25G PAM4 electrical signal into 2-path 12.5G NRZ electrical signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020785103.4U CN211720555U (en) | 2020-05-13 | 2020-05-13 | Optical module for transmitting 25G signal by adopting 12.5G optical chip |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202020785103.4U CN211720555U (en) | 2020-05-13 | 2020-05-13 | Optical module for transmitting 25G signal by adopting 12.5G optical chip |
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| CN211720555U true CN211720555U (en) | 2020-10-20 |
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| CN202020785103.4U Active CN211720555U (en) | 2020-05-13 | 2020-05-13 | Optical module for transmitting 25G signal by adopting 12.5G optical chip |
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