CN112601142B - Processing circuit of OAM signal in optical module receiving end and optical module - Google Patents
Processing circuit of OAM signal in optical module receiving end and optical module Download PDFInfo
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- CN112601142B CN112601142B CN202110223418.9A CN202110223418A CN112601142B CN 112601142 B CN112601142 B CN 112601142B CN 202110223418 A CN202110223418 A CN 202110223418A CN 112601142 B CN112601142 B CN 112601142B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
- H04Q11/0062—Network aspects
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
- H04Q11/0062—Network aspects
- H04Q11/0071—Provisions for the electrical-optical layer interface
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
- H04Q11/0062—Network aspects
- H04Q2011/0079—Operation or maintenance aspects
Abstract
The invention relates to a processing circuit of an OAM signal in an optical module receiving end and an optical module, wherein incident light outputs a photocurrent mirror image signal used for inputting the processing circuit after passing through a TIA connected with a PD, and the processing circuit separates the photocurrent mirror image signal according to the proportional relation of the OAM and the incident light intensity to obtain an effective OAM signal and a signal source used for a main optical path RSSI function; the processing circuit includes: the device comprises a voltage division module, a first signal filtering module, a signal amplifying module and a signal adjusting module. The processing circuit of the embodiment can realize OAM signal demodulation stripping, enables stripped OAM signals to have excellent sensitivity and no error, and can also be a circuit for maintaining a large dynamic range of a main optical path channel RSSI.
Description
Technical Field
The invention relates to the technical field of optical communication, in particular to an OAM signal processing circuit in an optical module receiving end and an optical module.
Background
In a recently emerging 5G forward semi-active network architecture scheme, each wavelength information channel of an xWDM (one of LANWDM, MWDM, CWDM) color optical module transmitting end not only transmits 25G main service information, but also superimposes a low-rate and small-amplitude OAM (Operation Administration Maintenance) signal (a fixed small-scale coefficient for the main optical path light intensity) for each wavelength to additionally transmit monitoring and management information, thereby realizing monitoring and configuration of a remote optical module.
As the OAM signal is directly loaded on the main service signal at the transmitting end of the optical module, if the amplitude is too large, the quality of the optical eye diagram at the transmitting end of the color optical module will be poor, for example, the margin of the optical eye diagram template will be poor, the jitter will be increased, and meanwhile, when the mixed signal is transmitted to the receiving end of the optical module at the opposite end, the signal-to-noise ratio of the whole optical fiber link will be reduced, the sensitivity of the main service will be degraded, and the normal operation of the 25G main service will be disturbed, so the amplitude of the OAM signal must be very small.
In addition, according to the link budget requirement of the semi-active networking, at the receiving end of the optical module, the sensitivity of a 25G main service signal is-13 dBm, the sensitivity of an OAM signal needs to be maintained at about-18 dBm within an industrial-level temperature range, at the receiving end of the module, the OAM signal and the main service signal are mixed together and are mirrored by a preamplifier (such as TIA), a module manufacturer performs two kinds of processing on the mirrored signal, firstly, the OAM signal with the small intensity (about-18 dBm) is stripped from the mixed signal and is connected with a post-level processing circuit to restore the OAM signal into the original OAM signal at the transmitting end, and secondly, the mixed signal is used for establishing the RSSI function of the main service signal, namely the RSSI function forcibly required in the SFF-8472 protocol.
Therefore, how to design a receiving end circuit capable of realizing OAM signal demodulation stripping while considering the RSSI function of the main service becomes a technical problem which needs to be solved at present.
Disclosure of Invention
Technical problem to be solved
In view of the above drawbacks and deficiencies of the prior art, the present invention provides a processing circuit for OAM signals at the receiving end of an optical module and an optical module.
(II) technical scheme
In order to achieve the purpose, the invention adopts the main technical scheme that:
in a first aspect, an embodiment of the present invention provides a processing circuit for an OAM signal in an optical module receiving end, where the incident light is output after passing through a TIA connected to a PD and is used to input the processing circuitThe processing circuit separates the photocurrent image signal imon according to the proportional relation between OAM and incident light intensity to obtain effective OAM signal and signal source V for main light path RSSI functionRSSI；
The processing circuit includes: the device comprises a voltage division module, a first signal filtering module, a signal amplification module and a signal adjustment module;
the photocurrent image signal imon is respectively input into the voltage division module and the first signal filtering module, and a signal source V for the main optical path RSSI function is obtained through the voltage division moduleRSSITo input the ADC port of the main optical path;
the first signal filtering module is used for filtering a direct-current component corresponding to the main service signal in the photocurrent mirror image signal imon and inputting the filtered signal to the signal amplifying module;
the signal amplification module performs two-stage amplification on the filtered signal by adopting a dual-channel rail-to-rail operational amplifier and filters noise to obtain an OAM signal which is used for inputting the signal adjustment circuit and is matched with incident light intensity;
the signal adjusting circuit is used for adjusting the OAM signal output by the signal amplifying module to obtain an effective OAM signal to be input to the IO interface of the main optical path.
Optionally, the voltage dividing module comprises: a first resistor R142 and a second resistor R143 connected in series;
a first terminal of the first resistor R142 is connected to the output terminal of the TIA, a second terminal of the second resistor R143 is grounded, an
The second end of the first resistor R142 and the first end of the second resistor R143 are connected in series and output a signal source V for the main optical path RSSI functionRSSI。
Optionally, the first signal filtering module comprises: a first capacitor C202, a second capacitor C198;
the first end of the first capacitor C202 and the first end of the second capacitor C198 are connected to the output end of the TIA, the second end of the first capacitor C202 is grounded, and the second end of the second capacitor C198 is connected to the signal input end INA + of the signal amplification module.
Optionally, the signal amplification module includes: a first stage operational amplifier and a second stage operational amplifier;
the signal passing through the first signal filtering module is input into a positive input end INA + of the first-stage operational amplifier, a third resistor R141 is arranged between a reverse input end INA-and an output end OUTA of the first-stage operational amplifier, and the reverse input end INA-is also connected with a fourth resistor R140 with one end grounded;
a signal output by an output end OUTA of the first-stage operational amplifier passes through a first blocking capacitor C199 and an RC low-pass filter, a direct-current signal and noise in the signal are filtered and then input to a forward input end INB + of the second-stage operational amplifier, a fifth resistor R147 is arranged between a reverse input end INB-and the output end OUTB of the second-stage operational amplifier, and the reverse input end (INB-) is also connected with a sixth resistor R146 with one end grounded;
an output end OUTB of the second-stage operational amplifier is connected with a second blocking capacitor C200, and a signal output by the output end OUTB is input into the signal adjusting circuit after a direct-current signal is filtered by the second blocking capacitor C200;
the amplification factor of the second-stage operational amplifier is larger than that of the first-stage operational amplifier, and the intensity of the signal output by the output end OUTB is in fixed proportion to the incident light intensity.
Optionally, the positive electrode of the power supply of the signal amplification module is connected with 2.4V direct current, and the negative electrode of the power supply is connected with-2.4V direct current.
Optionally, the signal conditioning circuit comprises: a zero-crossing comparator constructed by an operational amplifier with a rail-to-rail output function;
the positive input end of the zero-crossing comparator receives an OAM signal which is output by the signal amplification module and matched with incident light intensity, and the output end outputs an effective OAM signal to the main optical path;
the positive pole of the zero-crossing comparator power supply is connected with 3.3V direct current, and the negative pole and the reverse input end of the power supply are respectively grounded.
Optionally, the processing circuit is suitable for a temperature of-40 ° to 85 °, and the resistance value of the first resistor R142 and the resistance value of the second resistor R143 are both greater than one kilo ohm; the OAM signal intensity is 3% to 5% of the incident light intensity.
In a second aspect, an embodiment of the present invention further provides an optical module, where a receiving end of the optical module is provided with a processing circuit for an OAM signal in the receiving end of the optical module according to any one of the above first aspects, and the processing circuit is connected to a branch of a TIA output end in the receiving end of the optical module.
(III) advantageous effects
The processing circuit in the embodiment of the invention is used for effectively stripping the OAM signal and simultaneously acquiring the signal source V for the RSSI function of the main light pathRSSISpecifically, the main optical path RSSI signal can be taken out through the voltage division module, thereby realizing the main optical path RSSI function.
The processing circuit in the embodiment can demodulate and strip extremely weak OAM signals from mixed signals, and obtain excellent OAM signal sensitivity within a strict industrial-grade temperature range (-40-85 degrees), wherein the average value is-26 dBm, the distance is normalized to-18 dBm, and the margin exceeding 8dB exists, so that a very large OAM signal dynamic range is obtained, and OAM signal error codes cannot occur.
Drawings
Fig. 1 is a schematic structural diagram of a processing circuit for OAM signals according to an embodiment of the present invention;
FIG. 2 is a diagram illustrating a mixed voltage signal V _ imon after passing through a PD in an optical signal received by the receiving circuit of FIG. 1;
fig. 3 is a schematic diagram of demodulating a stripped OAM signal in an embodiment of the present invention;
fig. 4 is a schematic diagram of an OAM signal used in the main control module obtained by processing the OAM signal of fig. 3 in the embodiment of the present invention.
Description of reference numerals:
a first resistor R142;
a second resistor R143;
a third resistor R141;
a fourth resistor R140;
a fifth resistor R147;
a sixth resistor R146;
a first capacitor C202;
a second capacitor C198;
a first dc blocking capacitance C199;
a second blocking capacitor C200;
a filter capacitor C203;
a seventh resistor R148;
a third capacitor C201;
the power supply comprises a signal amplification module OPA1, a power supply anode VCC-and a power supply cathode VCC + of the signal amplification module;
the first-stage operational amplifier CH _ A comprises a positive input end INA +, a positive input end INA and an output end OUTA of the first-stage operational amplifier;
a positive input end INB +, a positive input end INB-and an output end OUTB of the second-stage operational amplifier CH _ B;
a zero-crossing comparator OPA2, a positive input terminal INA +, a positive input terminal INA-, an output terminal OUT, a power supply positive pole VCC-, and a power supply negative pole VCC + of a zero-crossing comparator OPA 2.
Detailed Description
For the purpose of better explaining the present invention and to facilitate understanding, the present invention will be described in detail by way of specific embodiments with reference to the accompanying drawings.
In order to better understand the above technical solutions, exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention can be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
Example one
As shown in fig. 1, an embodiment of the present invention provides a schematic structural diagram of an OAM signal processing circuit, where the OAM signal processing circuit of this embodiment is used in a receiving end of an optical module, and is used to strip out an OAM signal in incident light, so as to better realize reporting of optical power in a main optical path/main service.
The incident light received by the receiving end of the optical module in this embodiment includes: a main traffic signal RSSI and configured OAM signals that govern RSSI.
In this embodiment, the incident light outputs a photocurrent mirror signal imon for inputting to the processing circuit after passing through a preamplifier TIA connected to the PD, and the processing circuit separates the photocurrent mirror signal imon according to a proportional relationship between OAM and incident light intensity to obtain an effective OAM signal and a signal source V for a main light path RSSI functionRSSI。
In this embodiment, the TIA provides a reverse bias voltage for the photoelectric conversion module PD, so that the photoelectric conversion module PD can normally operate, and a current signal converted by the photoelectric conversion module PD is mirrored and marked as imon.
The processing circuit of the embodiment may include: the device comprises a voltage division module, a first signal filtering module, a signal amplification module and a signal adjustment module;
the photocurrent image signal imon is respectively input into the voltage division module and the first signal filtering module, and a signal source V for the main optical path RSSI function is obtained through the voltage division moduleRSSITo input the ADC port of the main optical path MCU;
the first signal filtering module is used for filtering a direct-current component corresponding to the main service signal in the photocurrent mirror image signal imon and inputting the filtered signal to the signal amplifying module;
the signal amplification module performs two-stage amplification on the filtered signal by adopting a dual-channel rail-to-rail operational amplifier and filters noise to obtain an OAM signal which is used for inputting the signal adjustment circuit and is matched with incident light intensity;
the signal adjusting circuit is used for adjusting the OAM signal output by the signal amplifying module to obtain an effective OAM signal to be input to the IO interface of the main optical path.
The processing circuit of the embodiment can effectively strip the OAM signal in the incident light, can obtain a great OAM signal dynamic range, does not generate OAM signal error codes, and can obtain the OAM signal with excellent sensitivity and saturation point.
Example two
In order to better explain the processing circuit of the embodiment of the present invention, the following detailed description is made with reference to fig. 1 to 4.
In fig. 1, at the receiving end of the optical module, a 25G optical detector PD induces an incident optical signal to generate a current signal, which is a mixed signal including a 25G main service signal and an OAM signal.
The 25G TIA is used to provide a reverse bias voltage to the PD on the one hand to enable the PD to function properly and to mirror out the current signal, labeled imon, on the other hand.
The voltage division module in fig. 1 is composed of a first resistor R142 and a second resistor R143 connected in series; a first end of the first resistor R142 is connected to an output end of the TIA, a second end of the second resistor R143 is grounded, and a second end of the first resistor R142 and a first end of the second resistor R143 are connected in series and output a signal source V for a main optical path RSSI functionRSSI。
That is, imon is sent to the first resistor R142 and the second resistor R143, the created mixed voltage signal is labeled V _ imon to provide a signal source for the subsequent OAM signal stripping process, and the voltage signal created on the second resistor R143 alone is labeled V _ imonRSSIAnd a signal source is provided for a later-stage RSSI processing circuit (main service optical path), so that a signal source can be provided for realizing an OAM signal demodulation function and an RSSI function respectively, and therefore, an optical current mirrored from the TIA is sent to the first resistor R142 and the second resistor R143.
The voltage division module adopting the two resistor designs in this embodiment can ensure the RSSI signal of the main optical path, and simultaneously can not reduce the strength of the OAM signal. Voltage signal V due to main light path RSSIRSSIThe OAM original voltage signal V _ imon will be determined by the first resistor R142 and the second resistor R143 together, which is determined entirely by the second resistor R143, and the additional addition of this first resistor corresponds to an adjustable factor for RSSI and OAM.
Selecting a second resistor R143 of suitable value such that imon establishes a V across the second resistor R143RSSIThe original voltage signal is sent to an ADC port (ADC port) of the main optical path MCU after passing through the filter capacitor C203.
In the present embodiment, five kinds of incident light are set by a five-point RSSI calibration method, that is, five kinds of incident light are setStrong, as labeled RX _ PWR, the MCU ADC reads five corresponding VsRSSIVoltage values, e.g. marked as VADCThe incident light intensity and V are enabled to be obtained through an algorithm in the MCU (the algorithm can also be an algorithm of an upper computer in the optical module)RSSIA certain relation is formed, so that the main optical path RSSI function is realized and a large dynamic range is obtained.
Understandably, VRSSIAnd the incident light intensity RX _ PWR, by five-point calibration, form a unitary quartic equation, as follows:
RX_PWR=K1*VADC^4+K2*VADC^3+K3*VADC^2+K4*VADC+B，
according to a five-point calibration method, obtaining parameters K1, K2, K3, K4 and B, and further obtaining the incident light intensity and VRSSIThe above formula is used as the relational expression of (1).
In specific use, when incident light changes, the MCU ADC in the optical module reads a corresponding VADCBringing in the above-mentioned incident light intensity sum VRSSIIn the relation of (3), RX _ PWR can be calculated, and the MCU completes reporting the optical power.
It should be noted that, in the 25G optical module with an OAM signal function, there are two optical signals, one is a 25G main service optical signal, and the other is an OAM optical signal. The 25G main service optical signal (called a main optical path for short) needs to support the RSSI function according to the standard protocol, that is, the receiving end optical signal strength indication (that is, the incident light intensity indication).
That is to say, V _ imon is a mixed voltage signal, and the components of V _ imon are as shown in fig. 2, and are divided into a weak OAM signal and a relatively strong 25G main service signal, and the 25G main service signal includes two components, namely MS1 (a direct current signal component in the main service voltage signal) and MS2 (no modulation signal component in the 25G main voltage signal), which both interfere with the weak OAM signalRSSIToo large results in saturation of the MCU ADC in the main light path, and V is not good enough in small incident lightRSSIToo small as a result ofThe main optical path MCU ADC can not be identified or has poor identification precision, and on the other hand, the OAM signal is properly enhanced, so that the subsequent circuit can process the OAM signal.
It is understood that, in the main service voltage signal established by the 25G main service optical signal in the dual resistors (e.g., the first resistor R142 and the second resistor R143), the MS1 may be an internal dc signal component of the main service voltage signal, and the MS2 may be an internal modulation signal component of the main service voltage signal. For OAM signals, MS1 and MS2 are both noise signals. To this end, in this embodiment, the MS1 is disposed of using the second capacitor C198 and the fm 2 is removed using the first capacitor C202 by-passing to ground.
In this embodiment, the resistance of the first resistor R142 and the resistance of the second resistor R143 may be in the kilo-ohm range.
In addition, the first signal filtering module in this embodiment may include: a first capacitor C202, a second capacitor C198; the first end of the first capacitor C202 and the first end of the second capacitor C198 are connected to the output end of the TIA, the second end of the first capacitor C202 is grounded, and the second end of the second capacitor C198 is connected to the signal input end INA + of the signal amplification module.
In addition, the signal amplification module OPA1 in the present embodiment may include: a first stage operational amplifier and a second stage operational amplifier; the signal passing through the first signal filtering module is input into a positive input end INA + of the first-stage operational amplifier, a third resistor R141 is arranged between a reverse input end INA-and an output end OUTA of the first-stage operational amplifier, and the reverse input end INA-is also connected with a fourth resistor R140 with one end grounded;
a signal output by an output end OUTA of the first-stage operational amplifier CH _ a passes through a first blocking capacitor C199 and an RC low-pass filter (a filter is formed by a seventh resistor R148 and a third capacitor C201 in fig. 1), a direct-current signal and noise in the signal are filtered (for example, OUT1 in fig. 1), and then the signal is input to a forward input end INB + of the second-stage operational amplifier CH _ B, a fifth resistor R147 is arranged between an inverting input end INB-and the output end OUTB of the second-stage operational amplifier, and the inverting input end INB-is further connected with a sixth resistor R146 with one end grounded;
an output end OUTB of the second-stage operational amplifier is connected with a second blocking capacitor C200, and a signal output by the output end OUTB is input into the signal adjusting circuit after a direct-current signal is filtered by the second blocking capacitor C200;
the amplification factor of the second-stage operational amplifier is larger than that of the first-stage operational amplifier, and the intensity of the signal output by the output end OUTB is in fixed proportion to the incident light intensity.
Particularly, the anode VCC + of the power supply of the signal amplification module is connected with 2.4V direct current, and the cathode VCC-of the power supply is connected with-2.4V direct current.
In this embodiment, after the mixed voltage signal V _ imon passes through the first capacitor C202 and the second capacitor C198, the MS1 and MS2 are substantially weakened and isolated, and the remaining very weak OAM signal is sent to a first-stage ac small-signal amplifier (i.e. a first-stage operational amplifier, for short, a first-stage amplifier) which is composed of a first channel of a dual-channel rail-to-rail OPA1 cooperating with a fourth resistor R140 and a third resistor R141, and the weak OAM signal and a small amount of noise that may be mixed are pre-amplified by adjusting the appropriate resistance values of the fourth resistor R140 and the third resistor R141, and the signal coming out of the first-stage amplifier is labeled as V _ imonOUTAV is removed through the first DC blocking capacitor C199OUTAThe DC component inside the filter passes through an RC low-pass filter consisting of a seventh resistor R148 and a third capacitor C201 to filter VOUTAThe noise inside is sent to a second-stage AC small-signal amplifying circuit, the amplifying circuit is composed of a second channel of a dual-channel rail-to-rail operational amplifier OPA1 and a resistor sixth resistor R146 and a fifth resistor R147, and is used as a main amplifying circuit, because the input signal of the amplifier is almost a pure OAM signal at the moment, the proper sixth resistor R146 and the proper fifth resistor R147 can be selected, the amplification factor is larger than that of the first-stage pre-amplifying circuit, and in addition, dual power supplies are specially adopted to supply power to the OPA1, so that the second-stage amplifying circuit of the OPA1 can amplify the pure OAM small signal with larger amplification factor, and because the dual power supplies power to the OPA1 outputting the rail-to-rail output, the dynamic range of the second-stage amplifying circuit is large, and the second-stage amplifying circuit is far away from an output saturation point, which means the amplifier circuitThe processing circuit of an embodiment may tolerate a large dynamic range of incident light intensity, i.e., both strong OAM signals and very weak OAM signals may be tolerated by the large dynamic range.
In addition, the signal from the second stage AC small-signal amplifier (i.e. the second stage operational amplifier) is marked as VOUTBFirst passes through a second DC blocking capacitor C200, marked as V_INSo that V is_INThe dc component of the signal that may be present is isolated leaving only a useful, relatively clean OAM signal, and the OAM signal is arranged symmetrically up and down around 0v as shown in fig. 3.
Will V_INThe positive polarity input end of the zero-crossing comparator OPA2 is introduced, and the zero-crossing comparator constructed by the OPA2 with the rail-to-rail output function is applied to obtain an output signal (a pure OAM signal).
As shown in fig. 4, a pure OAM signal is input to the I/O of the main optical path MCU, and can be easily decoded by the MCU to recover the original OAM signal at the optical module transmitting end, because the amplitude of the waveform of the pure OAM signal is large enough (close to the power voltage), and when the incident light (the original OAM signal and the original OAM signal mixed in a fixed ratio) changes in a large dynamic range, the amplitude of the relatively pure OAM signal remains unchanged at the optical module receiving end, so that the original OAM signal coming out of the optical module transmitting end demodulates and separates the OAM signal that reaches the optical module receiving end after passing through the active optical network, and obtains a very large dynamic range, i.e. a very good OAM sensitivity and saturation point.
That is, the signal adjusting circuit in the present embodiment may include: a zero-crossing comparator constructed by an operational amplifier with a rail-to-rail output function;
the positive direction input end of the zero-crossing comparator receives an OAM signal which is output by the signal amplification module and matched with incident light intensity, and the output end outputs an effective OAM signal to the main light path MCU.
The positive pole of the zero-crossing comparator power supply is connected with 3.3V direct current, and the negative pole and the reverse input end of the power supply are respectively grounded.
The processing circuit in this embodiment takes out the main optical path RSSI signal by using two resistors connected in series, thereby implementing the main optical path RSSI function, and simultaneously demodulates and strips the extremely weak OAM signal from the mixed signal through the first signal filtering circuit, the signal amplifying module and the signal adjusting module.
Therefore, when the processing circuit is applied to a receiving end, excellent OAM signal sensitivity can be obtained within a strict industrial-grade temperature range (-40-85 degrees), the average value is-26 dBm, the distance is normalized-18 dBm, and the margin exceeding 8dB is provided. That is, the sensitivity of the OAM signal required by the existing protocol specification is-18 dBm, and the average value of the sensitivity of the OAM signal can reach-26 dBm, which is 8dB margin away from-18 dBm of the specification by the processing circuit in this embodiment.
The processing circuit of the embodiment can also obtain an excellent OAM signal saturation point which can reach more than +3dBm, thereby obtaining a great OAM signal dynamic range without OAM signal error codes.
EXAMPLE III
According to another aspect of the embodiments of the present invention, an optical module is further provided, where a receiving end of the optical module is provided with the processing circuit of the OAM signal in the receiving end of the optical module according to any one of the above embodiments, and the processing circuit is connected to a branch of the TIA output end in the receiving end of the optical module. The other branch of the TIA output end is connected with the MCU of the main optical path and is used for acquiring the RSSI of the main service signal.
The optical module of the embodiment can be applied to a 5G forward-transmission semi-active system architecture, has excellent sensitivity for receiving end OAM signal demodulation stripping of an OAM functional optical module, and maintains a large dynamic range of a main optical path channel RSSI.
It should be noted that in the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word "comprising" does not exclude the presence of elements or steps not listed in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The invention may be implemented by means of hardware comprising several distinct elements, and by means of a suitably programmed computer. In the claims enumerating several means, several of these means may be embodied by one and the same item of hardware. The use of the terms first, second, third and the like are for convenience only and do not denote any order. These words are to be understood as part of the name of the component.
Furthermore, it should be noted that in the description of the present specification, the description of the term "one embodiment", "some embodiments", "examples", "specific examples" or "some examples", etc., means that a specific feature, structure, material or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, the claims should be construed to include preferred embodiments and all changes and modifications that fall within the scope of the invention.
It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention should also include such modifications and variations.
Claims (8)
1. A processing circuit of OAM signals in an optical module receiving end is characterized in that incident light passes through a TIA connected with a PD and then outputs a photocurrent mirror image signal used for being input into the processing circuit, and the processing circuit separates the photocurrent mirror image signal according to the proportional relation between operation, administration and maintenance OAM and incident light intensity to obtain an effective OAM signal and a signal source used for a main optical path RSSI function;
the processing circuit includes: the device comprises a voltage division module, a first signal filtering module, a signal amplification module and a signal adjustment module;
the photocurrent mirror image signal is respectively input into a voltage division module and a first signal filtering module, and a signal source for the RSSI function of a main optical path is obtained through the voltage division module to be input into an ADC port of the main optical path;
the first signal filtering module is used for filtering a direct-current component corresponding to the main service signal in the photocurrent mirror image signal and inputting the filtered signal to the signal amplifying module;
the signal amplification module performs two-stage amplification on the filtered signal by adopting a dual-channel rail-to-rail operational amplifier and filters noise to obtain an OAM signal which is used for inputting the signal adjustment circuit and is matched with incident light intensity;
the signal adjusting circuit is used for adjusting the OAM signal output by the signal amplifying module to obtain an effective OAM signal to be input into an IO interface of the main optical path;
the voltage division module includes: a first resistor and a second resistor connected in series;
a first terminal of the first resistor is connected with an output terminal of the TIA, a second terminal of the second resistor is grounded, an
And the second end of the first resistor and the first end of the second resistor are connected in series and output a signal source for the main optical path RSSI function.
2. The processing circuit of claim 1, wherein the first signal filtering module comprises: a first capacitor and a second capacitor;
and the first end of the first capacitor and the first end of the second capacitor are connected with the output end of the TIA, the second end of the first capacitor is grounded, and the second end of the second capacitor is connected with the signal input end of the signal amplification module.
3. The processing circuit of claim 2, wherein the signal amplification module comprises: a first stage operational amplifier and a second stage operational amplifier;
the signal passing through the first signal filtering module is input into the forward input end of the first-stage operational amplifier, a third resistor is arranged between the reverse input end of the first-stage operational amplifier and the output end of the first-stage operational amplifier, and the reverse input end of the first-stage operational amplifier is also connected with a fourth resistor with one end grounded;
a signal output by the output end of the first-stage operational amplifier passes through a first blocking capacitor and an RC low-pass filter, a direct-current signal and noise in the signal are filtered and then input to the forward input end of the second-stage operational amplifier, a fifth resistor is arranged between the reverse input end of the second-stage operational amplifier and the output end of the second-stage operational amplifier, and the reverse input end of the second-stage operational amplifier is also connected with a sixth resistor with one end grounded;
the output end of the second-stage operational amplifier is connected with a second blocking capacitor, and a signal output by the output end of the second-stage operational amplifier is input into the signal adjusting circuit after a direct-current signal is filtered by the second blocking capacitor;
the amplification factor of the second-stage operational amplifier is greater than that of the first-stage operational amplifier, and the intensity of a signal output by the output end of the second-stage operational amplifier is in fixed proportion to the incident light intensity.
4. The processing circuit of claim 3, wherein the positive power supply terminal of the signal amplification module is connected to 2.4V DC, and the negative power supply terminal is connected to-2.4V DC.
5. The processing circuit of claim 3, wherein the signal conditioning circuit comprises: a zero-crossing comparator constructed by an operational amplifier with a rail-to-rail output function;
the positive input end of the zero-crossing comparator receives an OAM signal which is output by the signal amplification module and matched with incident light intensity, and the output end outputs an effective OAM signal to the main optical path;
the positive pole of the zero-crossing comparator power supply is connected with 3.3V direct current, and the negative pole and the reverse input end of the power supply are respectively grounded.
6. The processing circuit of claim 1, wherein the first resistor and the second resistor each have a resistance greater than one kilo-ohm;
the OAM signal intensity is 3% to 5% of the incident light intensity.
7. The processing circuit according to claim 2, wherein the processing circuit is adapted for a temperature of-40 ° to 85 °.
8. An optical module, characterized in that the receiving end of the optical module is provided with the processing circuit of the OAM signal in the receiving end of the optical module as recited in any one of claims 1 to 7, and the processing circuit is connected to a branch of the TIA output terminal in the receiving end of the optical module.
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| CN112969111B (en) * | 2021-05-17 | 2021-08-03 | 深圳市迅特通信技术股份有限公司 | OAM demodulation circuit for optical module and optical module |
| CN113630208A (en) * | 2021-08-23 | 2021-11-09 | 苏州苏驼通信科技股份有限公司 | Optical module operation and maintenance information demodulation method and system based on Demux technology |
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| CN104253735B (en) * | 2013-06-27 | 2019-05-24 | 中兴通讯股份有限公司 | Optical network unit, communication system and method |
| US9559786B2 (en) * | 2015-03-17 | 2017-01-31 | Mitsubishi Electric Research Laboratories, Inc. | Pilot-aided coherent receiver for optical communications |
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