SOA current automatic control circuit, method and optical module

Abstract

The application discloses a kind of SOA current automatic control circuit, method and optical module, SOA current automatic control circuit, comprising: SOA, photoelectric conversion circuit, voltage monitoring circuit, SOA drive circuit, the SOA is used to amplify input optical signal, the photoelectric conversion circuit is used to receive the optical signal after SOA amplification, and the amplified input optical signal is converted into electrical signal, the voltage monitoring circuit is used to monitor the electrical signal output by photoelectric conversion circuit, and according to the electrical signal monitored, the voltage size input to SOA drive circuit is automatically controlled, the SOA drive circuit is used to amplify the voltage signal output by voltage monitoring circuit, and automatically adjust the current size of SOA according to the voltage signal output by voltage monitoring circuit.The application adopts the mode of automatically controlling SOA current, to improve product efficiency and increase product reliability.

Description

Technical Field

[0001] This invention belongs to the field of optical communication technology, specifically relating to an SOA current automatic control circuit, method, and optical module. Background Technology

[0002] In optical modules with SOA (Optical Optical Amplifier), it is typically necessary to set the SOA current for different received light to ensure that sensitivity requirements are met in real time. Taking a 100G ZR4 as an example, the traditional approach in a traditional optical module is to set the SOA current via software, as follows:

[0003] 1. First, classify the received light into bands: band ranges: -30~-24(1), -24~-18(2), -18~-12(3), -12~-3.5(4), -3.5~-0(5);

[0004] 2. Perform SOA current adjustment for each range to confirm that the sensitivity of each range meets the requirements;

[0005] 3. Record the SOA current for each range;

[0006] 4. The optical module has 4 channels. Repeat steps 1-3 in sequence.

[0007] Nowadays, the production efficiency and cost of high-speed modules are very high. If software methods are used, the process of finding the SOA current to meet the sensitivity requirements is complicated and tedious, and cannot be controlled manually. The labor cost and yield are very low, which cannot meet the requirements of high efficiency and high quality. Summary of the Invention

[0008] The purpose of this invention is to overcome the shortcomings of the prior art and provide an automatic SOA current control circuit, method and optical module. This invention adopts a hardware circuit to automatically control the SOA current, eliminating the need for software-based SOA current setting, thereby improving the production efficiency and reliability of optical modules.

[0009] The technical solution of this invention is implemented as follows: This invention discloses an SOA current automatic control circuit, comprising:

[0010] SOA, which is used to amplify the input optical signal;

[0011] A photoelectric conversion circuit is used to receive the optical signal amplified by the SOA and convert the amplified input optical signal into an electrical signal.

[0012] A voltage monitoring circuit is used to monitor the electrical signal output by the photoelectric conversion circuit and automatically control the voltage input to the SOA driving circuit based on the monitored electrical signal.

[0013] The SOA driving circuit amplifies the voltage signal output by the voltage monitoring circuit and automatically adjusts the current of the SOA according to the voltage signal output by the voltage monitoring circuit.

[0014] Furthermore, the photoelectric conversion circuit includes a PD chip and a TIA chip. The PD chip is used to receive the optical signal amplified by the SOA and convert the amplified input optical signal into a current signal. The TIA chip is used to convert and amplify the current signal output by the PD chip.

[0015] Furthermore, the voltage monitoring circuit includes a transistor Q1, the base of which is connected to the output terminal of the photoelectric conversion circuit to monitor the electrical signal output by the photoelectric conversion circuit. The output terminal of the photoelectric conversion circuit is grounded through a resistor Rs. The transistor Q1 is used to automatically enter the on or off state according to the monitored electrical signal, and automatically control the voltage input to the SOA driving circuit.

[0016] Furthermore, the emitter of transistor Q1 is grounded, and the collector of transistor Q1 is connected to the positive input terminal of the operational amplifier, which is connected to a fixed voltage Vset.

[0017] Furthermore, the base of the transistor Q1 is connected to the output terminal of the photoelectric conversion circuit via resistor R2; the positive input terminal of the operational amplifier is connected to a fixed voltage Vset via resistor R1.

[0018] Furthermore, the SOA current automatic control circuit of the present invention also includes a capacitor C1, one end of which is connected to the base of the transistor Q1, and the other end of which is connected to the collector of the transistor Q1.

[0019] Furthermore, the SOA driving circuit includes an operational amplifier and a transistor Q2. The operational amplifier is used to amplify the voltage signal output by the voltage monitoring circuit and input the amplified signal to the transistor Q2. The transistor Q2 is used to automatically adjust the current of the SOA according to the signal output by the operational amplifier.

[0020] Furthermore, the base of transistor Q2 is connected to the output terminal of the operational amplifier, the collector of transistor Q2 is connected to the power supply, the emitter of transistor Q2 is connected to the positive terminal of SOA and the negative input terminal of the operational amplifier, and the negative terminal of SOA is grounded.

[0021] This invention discloses an optical module that employs the SOA current automatic control circuit described above.

[0022] This invention discloses an automatic current control method for SOA (Self-Controlled Anode), comprising the following steps:

[0023] SOA amplifies the input optical signal;

[0024] The photoelectric conversion circuit receives the optical signal amplified by the SOA and converts the amplified input optical signal into an electrical signal.

[0025] The voltage monitoring circuit monitors the electrical signal output by the photoelectric conversion circuit and automatically controls the voltage input to the SOA drive circuit based on the monitored electrical signal.

[0026] The SOA drive circuit amplifies the voltage signal output by the voltage monitoring circuit and automatically adjusts the current of the SOA according to the voltage signal output by the voltage monitoring circuit.

[0027] Furthermore, the voltage monitoring circuit includes a transistor Q1, the base of which is connected to the output terminal of the photoelectric conversion circuit, for monitoring the electrical signal output by the photoelectric conversion circuit;

[0028] The SOA driving circuit includes an operational amplifier and a transistor Q2. The operational amplifier is used to amplify the voltage signal output by the voltage monitoring circuit and input the amplified signal to the transistor Q2. The transistor Q2 is used to automatically adjust the current of the SOA according to the signal output by the operational amplifier.

[0029] When the input light increases, the light received by the photoelectric conversion circuit increases, the electrical signal output by the photoelectric conversion circuit increases, the base voltage of transistor Q1 increases, and the Vo of transistor Q1 increases. BE When the voltage increases, transistor Q1 turns on, the voltage at the positive input terminal of the operational amplifier decreases, and the output voltage of the operational amplifier decreases, causing the voltage of transistor Q2 to decrease. BE This reduces the SOA current, thus achieving automatic adjustment of the SOA current.

[0030] When the input light decreases, the light received by the photoelectric conversion circuit decreases, the electrical signal output by the photoelectric conversion circuit decreases, the base voltage of transistor Q1 decreases, and the Vo of transistor Q1 decreases. BE The voltage decreases, thus transistor Q1 is cut off, which increases the voltage at the positive input terminal of the operational amplifier and the output voltage of the operational amplifier. This leads to an increase in the VBE of transistor Q2, which in turn increases the SOA current, thus achieving automatic adjustment of the SOA current.

[0031] This invention has at least the following beneficial effects: Using the SOA current automatic control circuit of this invention, when the input light increases, the light received by the PD chip increases, the electrical signal output by the TIA chip increases, the base voltage of transistor Q1 increases, and the Vo of transistor Q1 increases. BE When the voltage increases, transistor Q1 turns on, the voltage at the positive input terminal of the operational amplifier decreases, and the output voltage of the operational amplifier decreases, causing the voltage of transistor Q2 to decrease. BE The input light decreases, thus reducing the SOA current and achieving automatic SOA current adjustment. When the input light decreases, the light received by the PD chip decreases, the electrical signal output by the TIA chip decreases, the base voltage of transistor Q1 decreases, and the Vo of transistor Q1 decreases. BE The voltage decreases, causing transistor Q1 to cut off, which in turn increases the voltage at the positive input terminal of the operational amplifier, leading to an increase in the output voltage of the operational amplifier. This, in turn, increases the VBE of transistor Q2, resulting in an increase in the SOA current. This achieves automatic adjustment of the SOA current. This invention uses hardware circuitry to automatically control the SOA current, eliminating the need for software-based SOA current settings, thereby improving the production efficiency of optical modules. Under the same functional conditions, the circuit of this invention can improve product performance and increase the reliability of the optical module, while also saving labor costs. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1 A circuit diagram of the SOA current automatic control circuit provided in an embodiment of the present invention. Detailed Implementation

[0034] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0035] Example 1

[0036] See Figure 1 This invention provides an SOA current automatic control circuit, comprising:

[0037] SOA (Semiconductor Optical Amplifier), which is used to amplify the input optical signal;

[0038] A photoelectric conversion circuit is used to receive the optical signal amplified by the SOA and convert the amplified input optical signal into an electrical signal.

[0039] A voltage monitoring circuit is used to monitor the electrical signal output by the photoelectric conversion circuit and automatically control the voltage input to the SOA driving circuit based on the monitored electrical signal.

[0040] The SOA driving circuit amplifies the voltage signal output by the voltage monitoring circuit and automatically adjusts the current of the SOA according to the voltage signal output by the voltage monitoring circuit.

[0041] Furthermore, the photoelectric conversion circuit includes a PD chip and a TIA chip. The PD chip is used to receive the optical signal amplified by the SOA and convert the amplified input optical signal into a current signal. The TIA chip is used to convert the current signal output by the PD chip into a voltage and amplify it.

[0042] Furthermore, the voltage monitoring circuit includes a transistor Q1, the base of which is connected to the output terminal of the photoelectric conversion circuit to monitor the electrical signal output by the photoelectric conversion circuit. The output terminal of the photoelectric conversion circuit is grounded through a resistor Rs. The transistor Q1 is used to automatically enter the on or off state according to the monitored electrical signal, and automatically control the voltage input to the SOA driving circuit, that is, automatically control the voltage input to the operational amplifier.

[0043] Furthermore, the emitter of transistor Q1 is grounded, and the collector of transistor Q1 is connected to the positive input terminal of the operational amplifier, which is connected to a fixed voltage Vset. Vset is set to a fixed voltage to determine the maximum value of Is.

[0044] Furthermore, the base of the transistor Q1 is connected to the output terminal of the photoelectric conversion circuit via resistor R2; the positive input terminal of the operational amplifier is connected to a fixed voltage Vset via resistor R1.

[0045] Furthermore, the SOA current automatic control circuit of the present invention also includes a capacitor C1, one end of which is connected to the base of the transistor Q1, and the other end of which is connected to the collector of the transistor Q1.

[0046] The purpose of capacitor C1 is to increase the voltage V between the collector (C) and base (B) of transistor Q1. CB Stable, maintaining a stable voltage at the positive input terminal of the operational amplifier, preventing sudden changes, and reducing external interference.

[0047] Furthermore, the SOA driving circuit includes an operational amplifier and a transistor Q2. The operational amplifier is used to amplify the voltage signal output by the voltage monitoring circuit and input the amplified signal to the transistor Q2. The transistor Q2 is used to automatically adjust the current of the SOA according to the signal output by the operational amplifier.

[0048] Furthermore, the base of transistor Q2 is connected to the output terminal of the operational amplifier, the collector of transistor Q2 is connected to the power supply, the emitter of transistor Q2 is connected to the positive terminal of SOA and the negative input terminal of the operational amplifier, and the negative terminal of SOA is grounded.

[0049] Example 2

[0050] This invention discloses an optical module that employs the SOA current automatic control circuit as described in Embodiment 1.

[0051] Example 3

[0052] See Figure 1 This invention discloses an automatic current control method for an SOA (Self-Controlled Aqueduct), comprising the following steps:

[0053] SOA amplifies the input optical signal;

[0054] The photoelectric conversion circuit receives the optical signal amplified by the SOA and converts the amplified input optical signal into an electrical signal.

[0055] The voltage monitoring circuit monitors the electrical signal output by the photoelectric conversion circuit and automatically controls the voltage input to the SOA drive circuit based on the monitored electrical signal.

[0056] The SOA drive circuit amplifies the voltage signal output by the voltage monitoring circuit and automatically adjusts the current of the SOA according to the voltage signal output by the voltage monitoring circuit.

[0057] Furthermore, the photoelectric conversion circuit includes a PD chip and a TIA chip. The PD chip is used to receive the optical signal amplified by the SOA and convert the amplified input optical signal into an electrical signal. The TIA chip is used to amplify the electrical signal output by the PD chip.

[0058] Furthermore, the voltage monitoring circuit includes a transistor Q1, the base of which is connected to the output terminal of the photoelectric conversion circuit to monitor the electrical signal output by the photoelectric conversion circuit. The output terminal of the photoelectric conversion circuit is grounded through a resistor Rs. The transistor Q1 is used to automatically enter the on or off state according to the monitored electrical signal, and automatically control the voltage input to the SOA driving circuit, that is, automatically control the voltage input to the operational amplifier.

[0059] Furthermore, the SOA driving circuit includes an operational amplifier and a transistor Q2. The operational amplifier is used to amplify the voltage signal output by the voltage monitoring circuit and input the amplified signal to the transistor Q2. The transistor Q2 is used to automatically adjust the current of the SOA according to the signal output by the operational amplifier.

[0060] Furthermore, the base of transistor Q2 is connected to the output terminal of the operational amplifier, the collector of transistor Q2 is connected to the power supply, the emitter of transistor Q2 is connected to the positive terminal of SOA and the negative input terminal of the operational amplifier, and the negative terminal of SOA is grounded.

[0061] When the input light increases, PO (Power Out, the output optical power after SOA amplification also increases), the light received by the PD chip increases, the voltage signal output by the TIA chip increases, the base voltage of transistor Q1 increases, the VBE of transistor Q1 increases, transistor Q1 turns on, the voltage at the positive input terminal of the operational amplifier decreases, the output voltage of the operational amplifier decreases, causing the VBE of transistor Q2 to decrease. BE This reduces the SOA current, thus achieving automatic adjustment of the SOA current.

[0062] When the input light decreases, PO decreases, the light received by the PD chip decreases, the voltage signal output by the TIA chip decreases, the base voltage of transistor Q1 decreases, and the V of transistor Q1 decreases. BE The voltage decreases, thus transistor Q1 is cut off, which increases the voltage at the positive input terminal of the operational amplifier and the output voltage of the operational amplifier. This leads to an increase in the VBE of transistor Q2, which in turn increases the SOA current, thus achieving automatic adjustment of the SOA current.

[0063] Furthermore, the emitter of transistor Q1 is grounded, and the collector of transistor Q1 is connected to the positive input terminal of the operational amplifier, which is connected to a fixed voltage Vset.

[0064] Furthermore, the base of the transistor Q1 is connected to the output terminal of the photoelectric conversion circuit via resistor R2; the positive input terminal of the operational amplifier is connected to a fixed voltage Vset via resistor R1.

[0065] Furthermore, the SOA current automatic control circuit of the present invention also includes a capacitor C1, one end of which is connected to the base of the transistor Q1, and the other end of which is connected to the collector of the transistor Q1.

[0066] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An SOA current automatic control circuit, characterized in that, include: SOA, which is used to amplify the input optical signal; A photoelectric conversion circuit is used to receive the optical signal amplified by the SOA and convert the amplified input optical signal into an electrical signal. A voltage monitoring circuit is used to monitor the electrical signal output by the photoelectric conversion circuit and automatically control the voltage input to the SOA driving circuit based on the monitored electrical signal. The SOA driving circuit includes an operational amplifier and a transistor Q2. The operational amplifier is used to amplify the voltage signal output by the voltage monitoring circuit and input the amplified signal to the transistor Q2. The transistor Q2 is used to automatically adjust the current of the SOA according to the signal output by the operational amplifier. The voltage monitoring circuit includes a transistor Q1. The base of transistor Q1 is connected to the output terminal of the photoelectric conversion circuit to monitor the electrical signal output by the photoelectric conversion circuit. The output terminal of the photoelectric conversion circuit is grounded through a resistor Rs. Transistor Q1 automatically enters the on or off state according to the monitored electrical signal, automatically controlling the voltage input to the SOA driver circuit, i.e., automatically controlling the voltage input to the operational amplifier. The emitter of transistor Q1 is grounded, and the collector of transistor Q1 is connected to the positive input terminal of the operational amplifier. The positive input terminal of the operational amplifier is connected to a fixed voltage Vset. The base of transistor Q1 is connected to the output terminal of the photoelectric conversion circuit through a resistor R2; the positive input terminal of the operational amplifier is connected to the fixed voltage Vset through a resistor R1.

2. The SOA current automatic control circuit as described in claim 1, characterized in that: The photoelectric conversion circuit includes a PD chip and a TIA chip. The PD chip is used to receive the optical signal amplified by the SOA and convert the amplified input optical signal into a current signal. The TIA chip is used to convert and amplify the current signal output by the PD chip.

3. The SOA current automatic control circuit as described in claim 1, characterized in that: It also includes a capacitor C1, one end of which is connected to the base of the transistor Q1, and the other end of which is connected to the collector of the transistor Q1.

4. The SOA current automatic control circuit as described in claim 1, characterized in that: The base of transistor Q2 is connected to the output of the operational amplifier, the collector of transistor Q2 is connected to the power supply, the emitter of transistor Q2 is connected to the positive terminal of SOA and the negative input terminal of the operational amplifier, and the negative terminal of SOA is grounded.

5. An optical module, characterized in that: The SOA current automatic control circuit as described in any one of claims 1 to 4 is adopted.

6. An automatic current control method for SOA, characterized in that, Based on the SOA current automatic control circuit according to any one of claims 1 to 4, the SOA current automatic control method includes the following steps: SOA amplifies the input optical signal; The photoelectric conversion circuit receives the optical signal amplified by the SOA and converts the amplified input optical signal into an electrical signal. The voltage monitoring circuit monitors the electrical signal output by the photoelectric conversion circuit and automatically controls the voltage input to the SOA drive circuit based on the monitored electrical signal. The SOA driver circuit amplifies the voltage signal output by the voltage monitoring circuit and automatically adjusts the current of the SOA according to the voltage signal output by the voltage monitoring circuit.

7. The SOA current automatic control method as described in claim 6, characterized in that: When the input light increases, the light received by the photoelectric conversion circuit increases, the electrical signal output by the photoelectric conversion circuit increases, the base voltage of transistor Q1 increases, and the Vo of transistor Q1 increases. BE When the voltage increases, transistor Q1 turns on, the voltage at the positive input terminal of the operational amplifier decreases, and the output voltage of the operational amplifier decreases, causing the voltage of transistor Q2 to decrease. BE This reduces the SOA current, thus achieving automatic adjustment of the SOA current. When the input light decreases, the light received by the photoelectric conversion circuit decreases, the electrical signal output by the photoelectric conversion circuit decreases, the base voltage of transistor Q1 decreases, and the Vo of transistor Q1 decreases. BE The voltage decreases, thus transistor Q1 is cut off, which increases the voltage at the positive input terminal of the operational amplifier, increasing the output voltage of the operational amplifier, and consequently causing the voltage of transistor Q2 to decrease. BE This increases the SOA current, thus achieving automatic adjustment of the SOA current.

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