Optical communication constant power module

Abstract

The utility model discloses an optical communication constant power module, which belongs to the field of optical communication, is strong in adaptability and simple in structure, when different lasers are used as light sources, the output power of an access tool is a target value, and light attenuation does not need to be frequently adjusted like other lasers. The device mainly comprises a tool module, a light connection flange head is arranged in front of the tool module, a circuit board and a variable light attenuation VOA are further arranged in the tool module, the variable light attenuation VOA is connected with a shunt and the circuit board, the shunt is connected with a photodiode PD and an output light end, and the circuit board is connected with the photodiode PD. The optical communication constant power testing device is mainly used for optical communication constant power testing.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of optical communication, concretely, especially relates to an optical communication constant power module. BACKGROUND

[0002] In the field of optical communication, with the development of technology, the data transmission capacity presents explosive growth, the network architecture is increasingly complex, and the accurate control demand of optical signal intensity is increasingly increased. The early optical fiber communication system is relatively simple, and the service type is single, and the attenuation of optical signal is mainly completed by fixed optical decay, and this mode can basically meet the communication demand at that time.

[0003] But with the complex diversification of network, such as in dense wavelength division multiplexing (DWDM) system, the optical signals of different wavelengths are transmitted in the optical fiber at the same time, and each channel carries a large amount of key information. In order to balance the optical power of each channel, ensure that the optical signals of different wavelengths can still maintain stable and appropriate power level after long-distance transmission, and avoid problems such as signal interference and crosstalk caused by too large power difference, a device capable of flexibly adjusting the attenuation amount is needed. Moreover, network upgrading and new service expansion require more accurate and frequent dynamic adjustment of optical signal intensity. The adjustable optical decay technology emerges as the times require, which can dynamically adjust the attenuation amount of optical signal according to actual demand, ensure that the optical signal is transmitted within the appropriate power range, and thus optimize the performance of optical communication system and improve reliability.

[0004] A kind of testing device with announcement number CN201039183Y, existing optical power detection module needs to frequently adjust optical decay when testing different lasers, and output optical power is also unstable, which brings great inconvenience to test. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing a kind of optical communication constant power module, it is strong in adaptability, simple structure, when different laser is as light source, the output power of access tool is target value, and it is not necessary to adjust optical decay frequently like other lasers.

[0006] The utility model is realized by the following technical solutions:

[0007] A kind of optical communication constant power module, including tool module, the tool module front is equipped with optical connection flange, optical connection flange is connected with laser output light, tool module is also equipped with circuit board and adjustable optical decay VOA in, adjustable optical decay VOA is connected shunt and circuit board respectively, shunt is connected diode PD and output light end respectively, circuit board is connected with photoelectric diode PD.

[0008] Further, the shunt is a 1:99 optical shunt.

[0009] Further, the circuit board comprises an operational amplifier U1 and an operational amplifier U2, the photodiode PD is connected to the negative input end of the operational amplifier U1, the negative input end of the operational amplifier U1 is further connected with a filter circuit, the output end of the operational amplifier U1 is connected to the positive input end of the operational amplifier U2, the negative input end of the operational amplifier U2 is connected with a bias circuit, the output end of the operational amplifier U2 is connected with a resistor R7, and the resistor R7 is connected with the variable optical attenuator VOA.

[0010] Further, the filter circuit comprises a feedback resistor R2 and a filter capacitor C2, and the feedback resistor R2 and the filter capacitor C2 are connected in parallel between the negative input end of the operational amplifier U1 and the output end of the operational amplifier U1.

[0011] Further, the bias circuit comprises a slide rheostat R11, a voltage dividing resistor R9 and a voltage dividing resistor R4, the voltage dividing resistor R9 and the voltage dividing resistor R4 are connected in series, the voltage dividing resistor R9 is connected with a 5V power supply, the slide rheostat R11 is connected in parallel to the voltage dividing resistor R4, and the voltage dividing resistor R4 is connected with the negative input end of the operational amplifier U2; the bias voltage V3 obtained by voltage division of the voltage dividing resistor R9 and the slide rheostat R11 is provided to the positive input end of the operational amplifier U2.

[0012] Further, the slide rheostat R11 is provided with an optical power range table, and the range scale is dB, so that the module can be produced without calibration.

[0013] Compared with the prior art, the utility model has the advantages that:

[0014] 1. According to the demand, each resistance is adjusted to meet certain conditions, and when different lasers are used as light sources, the output power of the tool is the target value, and the optical attenuation does not need to be adjusted frequently like other lasers.

[0015] 2. The output optical power is stable, and the laser can ensure that the output optical power is unchanged whether it is heated or temperature adjusted.

[0016] 3. The actual optical power is fed back through the light-emitting diode, and the feedback voltage is controlled by the negative feedback regulation circuit composed of the operational amplifier. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is the structural principle diagram of the utility model;

[0018] Figure 2 It is the circuit diagram of the circuit board of the utility model. DETAILED DESCRIPTION

[0019] The utility model will be further described in combination with the drawings.

[0020] Example 1

[0021] like Figure 1 As shown, an optical communication constant power module includes a fixture module with an optical connector flange head at the front, which is connected to the laser output light. The fixture module also houses a circuit board and a variable optical attenuation (VOA). The VOA is connected to a splitter and the circuit board, which is connected to a photodiode (PD) and the output light end, respectively. The circuit board is connected to the photodiode (PD). The splitter is a 1:99 optical splitter. Light enters the optical connector flange head and first passes through the variable optical attenuation (VOA). The VOA is then connected to the 1:99 splitter. 1% of the light enters the photodiode (PD), and 99% of the light is output through an output jumper. The variable optical attenuation (VOA) can attenuate light by approximately 40dB. If greater attenuation is required, multiple VOAs can be connected in series.

[0022] Example 2

[0023] like Figure 2 As shown, an optical communication constant power module, the circuit board includes an operational amplifier U1 and an operational amplifier U2, the photodiode PD is connected to the negative input terminal of the operational amplifier U1, the negative input terminal of the operational amplifier U1 and the output terminal of the operational amplifier U1 are also connected to a filter circuit, the output terminal of the operational amplifier U1 is connected to the positive input terminal of the operational amplifier U2, the negative input terminal of the operational amplifier U2 is connected to a bias circuit, the output terminal of the operational amplifier U2 is connected to a resistor R7, and the resistor R7 is connected to an adjustable light attenuation VOA; the filter circuit includes a feedback resistor R2 and a filter capacitor C2, the feedback resistor R2 and the filter capacitor C2 are connected in parallel to the negative input terminal of the operational amplifier U1 and the operational amplifier Between the output ends of U1; eliminate high-frequency noise and improve the stability of the circuit; the bias circuit includes a sliding rheostat R11, a voltage-dividing resistor R9 and a voltage-dividing resistor R4, the voltage-dividing resistor R9 and the voltage-dividing resistor R4 are connected in series, the voltage-dividing resistor R9 is connected to a 5V power supply, the sliding rheostat R11 is connected in parallel to both ends of the voltage-dividing resistor R4, and the voltage-dividing resistor R4 is connected to the negative input end of the operational amplifier U2; the bias voltage V3 obtained by dividing the voltage by the voltage-dividing resistor R9 and the sliding rheostat R11 is provided to the positive input end of the operational amplifier U2; the sliding rheostat R11 is provided with an optical power range meter (existing technology), the range scale is dB, and the module can be produced again without calibration, and the rest is the same as Example 1.

[0024] The operational amplifier U2 can also be replaced with a PID circuit (existing technology) to make power control more precise and stable.

[0025] V_OUT is the light attenuation voltage, the greater the V_OUT, the greater the intensity of the attenuation. When the input light power is higher than the target value, V1 is greater than V3, resulting in VOUT increases; VOUT increases light decay attenuation, resulting in a decrease in output power, and then played a feedback role, so as to maintain the output power to achieve the target value.

[0026] When the circuit reaches stability:

[0027] V1 = V2 = R9 / (R4 / / R11)

[0028] I PD = V1 / R2

[0029] Eliminate V1 to get:

[0030] I PD = R9 / ((R4 / / R11) * R2)

[0031] Assuming the photodiode PD sensitivity is 1A / W, the target value is 0dB, and the input light is 10dB. Then I PD should be 0.1mA, then just adjust the resistance of the voltage divider R4, so that R9 / ((R4 / / R11) * R2) ratio is 0.1, can get the output power for 0dB output power.

[0032] The laser output light access tool module flange, then output jumper light power meter, adjust the slide rheostat R11 get the desired power value. So a constant power tool module test is over, as long as in the required range, regardless of access to large power laser will output the power of this calibration. Use the input light should not be too large, so as not to burn adjustable optical decay, input light maximum value should refer to the adjustable optical decay manual; input light power must be greater than the target value, because the tool module can only reduce power can not increase power.

Claims

1. An optical communication constant power module comprising a tool module, characterized by: The front of the tool module is provided with a light connection flange, and the tool module is further provided with a circuit board and an adjustable optical attenuation VOA.

2. The optical communication constant power module according to claim 1, characterized in that: The splitter is a 1:99 optical splitter.

3. The optical communication constant power module of claim 1, wherein: The circuit board comprises an operational amplifier U1 and an operational amplifier U2, the photodiode PD is connected to the negative input end of the operational amplifier U1, the negative input end of the operational amplifier U1 and the output end of the operational amplifier U1 are further connected with a filter circuit, the output end of the operational amplifier U1 is connected to the positive input end of the operational amplifier U2, the negative input end of the operational amplifier U2 is connected with a bias circuit, the output end of the operational amplifier U2 is connected with a resistor R7, and the resistor R7 is connected to the adjustable optical attenuation VOA.

4. The optical communication constant power module according to claim 3, characterized in that: The filter circuit comprises a feedback resistor R2 and a filter capacitor C2, and the feedback resistor R2 and the filter capacitor C2 are connected in parallel between the negative input end of the operational amplifier U1 and the output end of the operational amplifier U1.

5. The optical communication constant power module of claim 3, wherein: The bias circuit comprises a slide rheostat R11, a voltage dividing resistor R9 and a voltage dividing resistor R4, the voltage dividing resistor R9 and the voltage dividing resistor R4 are connected in series, the voltage dividing resistor R9 is connected to a 5V power supply, the slide rheostat R11 is connected in parallel to the voltage dividing resistor R4, and the voltage dividing resistor R4 is connected to the negative input end of the operational amplifier U2.

6. The optical communication constant power module according to claim 5, characterized in that: The slide rheostat R11 is provided with a light power range table, and the range scale is dB.

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