CN112564817A - Optical modulation receiver topology circuit - Google Patents
Optical modulation receiver topology circuit Download PDFInfo
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- CN112564817A CN112564817A CN202011302901.8A CN202011302901A CN112564817A CN 112564817 A CN112564817 A CN 112564817A CN 202011302901 A CN202011302901 A CN 202011302901A CN 112564817 A CN112564817 A CN 112564817A
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- 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
- H04B10/60—Receivers
- H04B10/66—Non-coherent receivers, e.g. using direct detection
- H04B10/69—Electrical arrangements in the receiver
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- 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
- H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
- H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
- H04B10/077—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using a supervisory or additional signal
- H04B10/0775—Performance monitoring and measurement of transmission parameters
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- 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
- H04B10/60—Receivers
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Abstract
本发明公开了一种光调顶接收机拓扑电路，包括光探测器PD，所述光探测器PD将接收到的光信号转换成电信号；还包括接收信号强度指示单元RSSI，其连接所述光探测器PD的输出端，所述接收信号强度指示单元RSSI抑制所述电信号中的业务信号分量，并复制出所述电信号中的调顶信号分量；低通滤波器，其连接所述接收信号强度指示单元RSSI的输出端，用于滤除所述调顶信号分量中的业务信号分量。本发明的光调顶接收机拓扑电路，能够降低解析出调顶信号的难度和硬件成本，改善调顶信号解析的精确度。
The invention discloses a topology circuit of an optical tunable top receiver, comprising a photodetector PD, which converts a received optical signal into an electrical signal; and a received signal strength indication unit RSSI, which is connected to the The output end of the photodetector PD, the received signal strength indicating unit RSSI suppresses the service signal component in the electrical signal, and reproduces the top-adjusting signal component in the electrical signal; a low-pass filter, which is connected to the The output end of the received signal strength indication unit RSSI is used for filtering out the service signal component in the top-adjusted signal component. The topology circuit of the optical top-adjusting receiver of the invention can reduce the difficulty and hardware cost of analyzing the top-adjusting signal, and improve the accuracy of analyzing the top-adjusting signal.
Description
Technical Field
The invention relates to the technical field of optical modulation and demodulation, in particular to a topological circuit of an optical modulation and demodulation receiver.
Background
Wavelength Division multiplexing (wdm) combines optical carrier signals of a plurality of different wavelengths together at a transmitting end through a multiplexer, and couples the optical carrier signals to the same optical fiber of an optical line for transmission; at the receiving end, the optical carriers of the various wavelengths are separated by a demultiplexer and then further processed by an optical receiver to recover the original signal. The wavelength division multiplexing technology is to fully utilize huge bandwidth resources brought by a low-loss region of a single-mode optical fiber, a low-loss window of the optical fiber can be divided into a plurality of channels according to different wavelengths or frequencies of light waves of each channel, so that a plurality of optical signals with different wavelengths are transmitted in one optical fiber at the same time, and optical carrier signals with different wavelengths are mutually independent, so that multiplexing transmission of multi-path optical signals can be realized in one optical fiber.
In the application of WDM technology, channel monitoring is an important technology that optical modules must possess. At present, channel monitoring mainly adopts a top-tuning technology, which means that a small-amplitude low-frequency signal modulation is superimposed on a signal at the end of an optical transmitter to serve as an identifier, different channels adopt different identifier information, and a receiving end can correspondingly acquire information such as wavelength and the like by detecting the identifier information, so that the function of channel monitoring is realized.
An optical modulation and reception topological circuit in the prior art is shown in fig. 1 and comprises an optical detector, a transimpedance amplifier, a low-pass filter and a top-modulation signal demodulation circuit, wherein the optical detector converts an optical signal superposed with a high-speed service signal and a low-speed top-modulation signal into an electric signal (a current signal), the transimpedance amplifier converts the current signal into a voltage signal, one path of the voltage signal is connected with a transceiver chip through an alternating-current coupling capacitor, and the GHz-level high-speed service signal is transmitted to a transceiver; one path is connected with a low-pass filter to filter service signals, the pilot tone signal is reserved and input into a pilot tone signal demodulation circuit, and the frequency or label information contained in the pilot tone signal is analyzed by the pilot tone signal demodulation circuit. Service signals are usually in GHz magnitude, and in order to effectively filter the service signals, the requirement of the low-pass filter on the inhibition of the service signals exceeds 40dB, so that the design difficulty is high; meanwhile, because the amplitude of the pilot tone signal is small, the signal output by the low-pass filter still has a low signal-to-noise ratio, and the demodulation circuit usually needs to amplify and further filter the signal, and then the signal is converted into a digital signal by an analog-to-digital converter, and the low-frequency pilot tone signal is analyzed from the digital signal. The circuit has a complex structure, and hardware cost is high due to more used devices; on the other hand, the structure also requires that the transimpedance amplifier has a high dynamic range and linearity, otherwise, the signal is distorted after passing through the transimpedance amplifier, and the difficulty of analyzing the top-tone signal is greatly improved.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a topological circuit of an optical pilot tone demodulation receiver, which can reduce the difficulty and hardware cost of resolving a pilot tone signal and improve the accuracy of resolving the pilot tone signal.
In order to solve the above technical problem, the present invention provides an optical modulation and reception topology circuit, including an optical detector PD that converts a received optical signal into an electrical signal, and further including,
a received signal strength indication unit RSSI connected to the output end of the optical detector PD, the received signal strength indication unit RSSI suppressing the service signal component in the electrical signal and copying the set-top signal component in the electrical signal;
and the low-pass filter is connected with the output end of the received signal strength indication unit RSSI and is used for filtering the service signal component in the set-top signal component.
In a preferred embodiment of the present invention, it is further included that a low-pass cutoff frequency of the low-pass filter is adjustable.
In a preferred embodiment of the present invention, the low pass filter further comprises an RC filter including a resistor R with an adjustable resistance.
In a preferred embodiment of the present invention, the apparatus further comprises a dc blocking ac unit, which is connected to an output terminal of the RSSI, and the low pass filter is connected to the dc blocking ac unit; and the direct current blocking traffic unit is used for filtering out a direct current component in the pilot tone signal component.
In a preferred embodiment of the present invention, the dc/ac blocking unit further comprises a filter capacitor C0Said filter capacitor C0And filtering out a direct current component in a set top signal component output by the received signal strength indication unit RSSI.
In a preferred embodiment of the present invention, the apparatus further comprises a voltage converting unit, connected to an output terminal of the RSSI, wherein the voltage converting unit converts a current signal output by the RSSI into a voltage signal.
In a preferred embodiment of the present invention, the voltage converting unit further comprises a signal converting resistor R0The signal conversion resistor R0One end of the second switch is grounded, and the other end of the second switch is simultaneously connected with the received signal strength indicator unit RSSI and the direct current blocking traffic unit.
In a preferred embodiment of the present invention, the dc-dc converter further comprises a comparison amplifier, a positive phase input terminal of which is connected to the output terminal of the dc-dc blocking ac unit, and a negative phase input terminal of which is connected to a reference voltage terminal, and the comparison amplifier is used for amplifying the input signal with smaller amplitude to a logic level.
In a preferred embodiment of the present invention, the comparison amplifier is an open-loop comparison amplifier.
In a preferred embodiment of the present invention, the transceiver further includes a transimpedance amplifier TIA connected to the output terminal of the optical detector PD, where the transimpedance amplifier TIA converts a current signal output by the optical detector PD into a voltage signal, and is connected to the transceiver chip through an ac coupling capacitor.
The invention has the beneficial effects that: the optical modulation and demodulation receiver topological circuit provided by the invention has the advantages that the received signal strength indicating unit RSSI copies the pilot tone signal component in the electric signal, the low-pass filter processes the pilot tone signal component copied by the received signal strength indicating unit RSSI, and the low-pass filter has the effect of inhibiting the service signal component, so that the inhibition requirement of the low-pass filter on the service signal is reduced, usually only about 10dB is required, the design difficulty and hardware cost of a pass filter are reduced, and the accuracy of pilot tone signal analysis is improved.
Drawings
Fig. 1 is a block diagram of a prior art rtc topology circuit;
fig. 2 is a block diagram of an optical tone demodulation topology circuit according to a preferred embodiment of the present invention.
Detailed Description
The present invention is further described below in conjunction with the following figures and specific examples so that those skilled in the art may better understand the present invention and practice it, but the examples are not intended to limit the present invention.
Examples
The embodiment of the invention discloses a light modulation receiver topological circuit, which is shown in figure 2 and comprises a light detector PD, a received signal strength indicating unit RSSI, a voltage conversion unit, a low-pass filter and a comparison amplifier.
The optical detector PD converts the optical signal superposed with the high-speed service signal and the low-speed ceiling adjusting signal into a current signal; the RSSI is connected with the output end of the optical detector PD, and the RSSI suppresses the service signal component in the current signal and outputs a current proportional to the low-frequency current component of the optical detector PD, namely, the tuning signal component in the current signal is copied. It is understood that the RSSI unit of the present invention can be a prior art off-the-shelf module, such as the ROSA with its own RSSI unit.
The voltage conversion unit is connected with the output end of the received signal strength indication unit RSSI and converts the current signal output by the received signal strength indication unit RSSI into a voltage signal. In one implementation scheme of the invention, the voltage conversion unit comprises a signal conversion resistor R0The signal conversion resistor R0One end of the second switch is grounded, and the other end of the second switch is simultaneously connected with the received signal strength indicator unit RSSI and the direct current blocking traffic unit.
The low pass filter LPF is connected with the output end of the voltage conversion unit and filters out the service signal component in the top-adjusting signal component. The positive phase input end of the comparison amplifier is connected with the output end of the low pass filter LPF, and the negative phase input end of the comparison amplifier is connected with the reference voltage end. In one implementation of this embodiment, the comparison amplifier preferably uses an open-loop comparison amplifier, has a large gain, amplifies the low-amplitude component of the pilot tone signal to a logic level, and resolves information contained in the pilot tone signal from the logic level output by the comparison amplifier.
With the change of an application scene, the average energy of optical signals transmitted by the same optical module also changes, the direct current component of the RSSI of the received signal strength indication unit also changes, and the decision threshold value of the tuning signal analysis circuit must be adjusted accordingly (that is, the reference voltage of the comparison amplifier needs to be adjusted), so that the logic level can be correctly analyzed. In order to solve the problem that the reference voltage of the comparison amplifier needs to be adjusted in order to adapt to a scene, the topology circuit of the invention further comprises a dc blocking and ac passing unit, the dc blocking and ac passing unit is connected to the output end of the voltage conversion unit, the low pass filter LPF is connected to the output end of the dc blocking and ac passing unit, and the dc blocking and ac passing unit filters a dc component in a top-adjusting signal component. Specifically, the direct current blocking AC/DC unit comprises a filter capacitor C0Said filter capacitor C0And filtering out a direct current component in a set top signal component output by the received signal strength indication unit RSSI.
In the above, the pilot signal component in the electrical signal is copied by the RSSI, the pilot signal component copied by the RSSI is processed by the low-pass filter, and the suppression requirement of the low-pass filter on the service signal is reduced due to the effect of the RSSI of the received signal strength indication unit, which is usually only about 10dB, so that the design difficulty of the low-pass filter is reduced; and because the circuit design can reduce the number of elements (without a complex tuning signal demodulation circuit), the hardware cost is reduced. And because the low-pass filter with reduced design difficulty can obtain the best filtering performance in application, the signal-to-noise ratio of the separated pilot tone signal is improved, and the accuracy of pilot tone signal analysis is improved.
Because the standards of operators have certain difference, the loaded tuning top signal has different frequencies in different applications, generally between 1kHz and 1MHz, and in order to ensure that the tuning top signal is correctly analyzed in different application scenes, the low-pass cut-off frequency of the low-pass filter LPF can be adjusted. In particular, the low pass filter LPF comprises an RC filter, which comprises a resistor R that is a resistance-adjustable resistor, in particular a programmable adjusting resistor, which supports adjustment by a user in different applications.
In other embodiments, the topology circuit further includes a transimpedance amplifier TIA connected to the output end of the photo detector PD, where the transimpedance amplifier TIA converts a current signal output by the photo detector PD into a voltage signal, connects to the transceiver chip through an ac coupling capacitor, and transmits a high-speed service signal of GHz level to the transceiver.
The above-mentioned embodiments are merely preferred embodiments for fully illustrating the present invention, and the scope of the present invention is not limited thereto. The equivalent substitution or change made by the technical personnel in the technical field on the basis of the invention is all within the protection scope of the invention. The protection scope of the invention is subject to the claims.
Claims (10)
1. An optical modulation receiver topology circuit comprising a Photo Detector (PD) that converts a received optical signal into an electrical signal, characterized in that: also comprises the following steps of (1) preparing,
a received signal strength indication unit RSSI connected to the output end of the optical detector PD, the received signal strength indication unit RSSI suppressing the service signal component in the electrical signal and copying the set-top signal component in the electrical signal;
and the low-pass filter is connected with the output end of the received signal strength indication unit RSSI and is used for filtering the service signal component in the set-top signal component.
2. The optical pilot tone receiver topology circuit of claim 1, wherein: the low-pass cut-off frequency of the low-pass filter can be adjusted.
3. The optical pilot tone receiver topology circuit of claim 2, wherein: the low-pass filter comprises an RC filter, and a resistor R included in the RC filter is a resistor with an adjustable resistance value.
4. The optical pilot tone receiver topology circuit of claim 1, wherein: the direct current blocking AC/AC unit is connected with the output end of the received signal strength indicating unit RSSI, and the low-pass filter is connected with the direct current blocking AC/AC unit; and the direct current blocking traffic unit is used for filtering out a direct current component in the pilot tone signal component.
5. The optical pilot tone receiver topology circuit of claim 4, wherein: the direct current blocking AC/DC unit comprises a filter capacitor C0Said filter capacitor C0And filtering out a direct current component in a set top signal component output by the received signal strength indication unit RSSI.
6. The optical pilot tone receiver topology circuit of claim 1, wherein: the device also comprises a voltage conversion unit which is connected with the output end of the received signal strength indication unit RSSI, and the voltage conversion unit converts the current signal output by the received signal strength indication unit RSSI into a voltage signal.
7. The optical pilot tone receiver topology circuit of claim 6, wherein: the voltage conversion unit comprises a signal conversion resistor R0The signal conversion resistor R0One end of the second switch is grounded, and the other end of the second switch is simultaneously connected with the received signal strength indicator unit RSSI and the direct current blocking traffic unit.
8. The optical pilot tone receiver topology circuit of claim 1, wherein: the positive phase input end of the comparison amplifier is connected with the output end of the DC-isolating AC unit, the negative phase input end of the comparison amplifier is connected with a reference voltage end, and the comparison amplifier is used for amplifying the input signal with smaller amplitude to a logic level.
9. The optical pilot tone receiver topology circuit of claim 8, wherein: the comparison amplifier is an open-loop comparison amplifier.
10. The optical pilot tone receiver topology circuit of claim 1, wherein: the optical detector further comprises a transimpedance amplifier TIA which is connected with the output end of the optical detector PD, converts a current signal output by the optical detector PD into a voltage signal and is connected with the transceiver chip through an alternating current coupling capacitor.
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| CN202011302901.8A CN112564817A (en) | 2020-11-19 | 2020-11-19 | Optical modulation receiver topology circuit |
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| CN202011302901.8A CN112564817A (en) | 2020-11-19 | 2020-11-19 | Optical modulation receiver topology circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113206720A (en) * | 2021-04-08 | 2021-08-03 | 江苏科大亨芯半导体技术有限公司 | Method and device for realizing top-adjusting message path |
| CN113300776A (en) * | 2021-04-30 | 2021-08-24 | 武汉联特科技股份有限公司 | Circuit and method for improving top-adjusting sensitivity |
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2020
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Patent Citations (5)
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| CN1367961A (en) * | 1999-08-20 | 2002-09-04 | 富士通株式会社 | Optical communication system, optical receiver and walvelength converter |
| KR20130101961A (en) * | 2012-02-09 | 2013-09-16 | 한국전자통신연구원 | Optical line terminal for controlling and monitoring optical power and wavelength of downstream wdm optical signals in bidirectional wavelength-division-multiplexing optical network |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113206720A (en) * | 2021-04-08 | 2021-08-03 | 江苏科大亨芯半导体技术有限公司 | Method and device for realizing top-adjusting message path |
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| CN113300776A (en) * | 2021-04-30 | 2021-08-24 | 武汉联特科技股份有限公司 | Circuit and method for improving top-adjusting sensitivity |
| CN113300776B (en) * | 2021-04-30 | 2022-08-16 | 武汉联特科技股份有限公司 | Circuit and method for improving top-adjusting sensitivity |
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