CN113359251A - Rapid coupling method of high-speed optical device - Google Patents
Rapid coupling method of high-speed optical device Download PDFInfo
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- CN113359251A CN113359251A CN202110698098.2A CN202110698098A CN113359251A CN 113359251 A CN113359251 A CN 113359251A CN 202110698098 A CN202110698098 A CN 202110698098A CN 113359251 A CN113359251 A CN 113359251A
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/42—Coupling light guides with opto-electronic elements
- G02B6/4201—Packages, e.g. shape, construction, internal or external details
- G02B6/4204—Packages, e.g. shape, construction, internal or external details the coupling comprising intermediate optical elements, e.g. lenses, holograms
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Abstract
The invention provides a quick coupling method of a high-speed optical device, and belongs to the technical field of optical path coupling. The invention comprises the following steps: the method comprises the following steps: before coupling, obtaining a Z-direction position coordinate difference value of optical fiber coupling in the presence and absence of a first collimating lens through simulation and/or a comparison experiment, and determining an out-of-focus displacement value and an out-of-focus direction of the optical fiber; step two: under the condition that a first collimating lens close to the laser is not placed, coupling and fixing a second collimating lens close to the receiving end of the optical fiber according to the optical power; step three: coupling the optical fiber and determining the position of the optical fiber when the optical power is maximum; step four: moving the optical fiber in the Z-axis direction according to the defocusing displacement value and the defocusing direction in the first step, then coupling the XY position of the optical fiber until the optical power is maximum, and fixing the optical fiber; step five: a first collimating lens coupled and fixed in turn for each channel. The invention has the beneficial effects that: the working hours are saved, the process route is simple, and the production efficiency is improved.
Description
Technical Field
The invention relates to an optical path coupling technology, in particular to a rapid coupling method of a high-speed optical device.
Background
At present, as shown in fig. 1, a mainstream optical path design in a high-speed multi-channel optical device is that light emitted by a laser chip at a transmitting TX end is combined with 4 paths of parallel light into a same optical fiber through a combining MUX element, or light with different wavelengths combined in a same optical fiber is decomposed into four paths of light through a demultiplexing DEMUX element at a receiving RX end, and the four paths of light are respectively incident into corresponding receiving photodiodes, taking the transmitting TX end as an example, a common coupling process in manufacturing is as follows (the same applies to the receiving RX end, except that directions of the light are different, a light direction of the transmitting TX end is from the laser chip to the optical fiber, and a light direction of the receiving RX end is from the optical fiber to the receiving photodiode): placing a collimating lens 2 and an optical fiber at a preset position, placing the collimating lens 1 of a specified channel (generally using an intermediate channel, such as a channel 1 or a channel 2), sequentially coupling the collimating lens 1, the collimating lens 2 and the optical fiber until the optical power of the channel is coupled to the maximum, preliminarily fixing the positions of the collimating lens 2 and the optical fiber, and after checking that the optical power meets the requirements when the four-channel collimating lens 1 is coupled to the optimal position, subsequently dividing into 2 process routes:
1. in the process route 1, 4 channel collimating lenses 1 are sequentially coupled and fixed, and after the fixing is finished, the collimating lenses 2 and the optical fibers are coupled for the second time, the optical power requirement of each channel and the optical power difference requirement among four channels are met near the optimal position of the simultaneous coupling value of the optical power of the four channels, and the collimating lenses 2 and the optical fibers are fixed after the specified position is found.
2. And in the process route 2, the collimating lens 1 of the appointed channel is coupled and fixed, the collimating lens 2 and the optical fiber are coupled for the second time after the curing is finished, so that the optical power coupling value of the channel meets the requirement, and the collimating lens 2 and the optical fiber are fixed after the appointed position is found. After the collimating lens 2 and the optical fiber are fixed, the collimating lens 1 of the rest channel is coupled for the second time and fixed, so that the optical power meets the requirement.
The difficulty of the process route 1 is that the collimating lens 1 is completely fixed when the collimating lens 2 and the optical fiber are coupled for the second time, four channels of optical power are required to simultaneously meet the power requirement and the optical power difference requirement between the four channels, the difficulty is high in actual production, the finding of the four-channel balance position takes a long time, the position meeting the requirement cannot be found, even if the designated position is found, a large deviation risk exists in the fixing process or later because the tolerance interval is small, and the bad proportion is increased.
The difficulty of the process route 2 is that the collimating lens coupling 1 of the designated channel, which is coupled and fixed for the first time, has a risk of dislocation after the collimating lens 2 and the optical fiber are fixed, and the decoupling and the recoupling can be required to be removed. The designated channel collimator lens coupling 1, which has been fixed, has an interference risk in coupling the remaining channel collimator lenses 1, and may need to be disassembled. The coupling and fixing of the collimating lens 1 need to be repeatedly performed, which increases the process complexity and affects the production efficiency.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a rapid coupling method of a high-speed optical device.
The invention comprises the following steps:
the method comprises the following steps: before coupling, obtaining a Z-direction position coordinate difference value of optical fiber coupling in the presence and absence of a first collimating lens through simulation and/or a comparison experiment, and determining an out-of-focus displacement value and an out-of-focus direction of the optical fiber;
step two: under the condition that a first collimating lens close to the laser is not placed, coupling and fixing a second collimating lens close to the receiving end of the optical fiber according to the optical power;
step three: coupling the optical fiber and determining the position of the optical fiber when the optical power is maximum;
step four: moving the optical fiber in the Z-axis direction according to the defocusing displacement value and the defocusing direction in the first step, then coupling the XY position of the optical fiber until the optical power is maximum, and fixing the optical fiber;
step five: a first collimating lens coupled and fixed in turn for each channel.
The invention is further improved, in the second-fifth step, in the process of coupling the second collimating lens and the optical fiber, the invention also comprises a step of responding to the current value.
In a further improvement of the present invention, the method for increasing the response current value includes: the optical power is increased at the transmitting TX end by increasing the laser drive current or by adding a semiconductor optical amplifier in the optical path, and the input optical power is increased at the receiving RX end.
The invention is further improved, in the first step, the difference of Z coordinate values of the second collimating lens when the optical power of each channel reaches the maximum value under the condition that the first lens exists or does not exist is obtained through a simulation experiment, and finally the defocusing amount of the second collimating lens in the Z direction is determined according to the difference value of each channel.
The method is further improved and further comprises an actual comparison experiment, the defocusing amount is verified through the actual comparison experiment to obtain the optimal defocusing amount, and the final position of the optical fiber coupling is confirmed according to the optimal defocusing amount.
Compared with the prior art, the invention has the beneficial effects that: the coupling of each channel is equivalent to the lens coupling of a single channel, so that a complex optical power channel balancing algorithm is avoided, the labor hour is saved, and the optical power difference between each channel can be reduced to the minimum. The process route is simple, and the production efficiency is improved.
Drawings
FIG. 1 is a schematic diagram of the optical path structure of the present invention;
FIG. 2 is a flow chart of the coupling method of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
As shown in fig. 1 and fig. 2, the present invention adopts a technical idea completely different from the conventional coupling method, in the case of not placing the collimating lens 1, the collimating lens 2 and the optical fiber are directly coupled and fixed, and then the collimating lens 1 of each channel is sequentially coupled and fixed according to the optical power requirement, because the collimating lens 2 and the optical fiber are already fixed, the coupling of each channel is equivalent to the lens coupling of a single channel, a complex optical power channel balancing algorithm is avoided, the man-hour is saved, and the optical power difference between each channel can be reduced to the minimum. The process route is simple, and the production efficiency is improved.
The technical difficulties of the invention are as follows:
1. in the final light path, a parallel light path is formed between the lens 1 and the lens 2, and in the case that the lens 1 does not participate, the divergent light path from the laser to the lens 2 needs to restore the final parallel light path to the maximum extent. Through simulation of optical simulation software, Z value difference of the optical fiber in the optical axis direction is a key, and the Z value difference in the XY direction is small and can be ignored. The Z value difference can be determined through simulation and actual comparison experiments, and after the lens 2 is coupled and fixed, the optical fiber is defocused in the active Z direction, so that a final parallel optical path is restored.
2. Under the condition that the lens 1 does not participate, the coupling efficiency of the transmitting laser or the receiving photodiode is low, in order to meet the requirement of the minimum optical power or response current, the transmitting TX end can increase the optical power by increasing the driving current of the laser, increasing a semiconductor optical amplifier SOA in an optical path and the like, and the receiving RX end can increase the response current value by increasing the input optical power and the like, so that the coupling of the transmitting TX end or the coupling of the receiving RX end is realized.
The first specific treatment method of the technical difficulty is as follows:
the simulation simulates the position of the fiber in the presence and absence of lens 1 according to the actual use of the component setup parameters, since this example goes to lens 2 for parallel light, the position of lens 2 is already determined, which is insensitive to Z-direction values, which are mainly fiber differences, and the fiber XY-values have little effect on the coupling, so in table 2 below, the XY-values are the coordinate position of lens 2 as a reference to experimental data, and the Z-values are the values of the Z-coordinate position of the fiber. According to the relative coordinate position of the optical fiber in the Z direction, the coordinate difference between the two is calculated, and the result is shown in Table 1:
TABLE 1
In addition, according to the 0.5dB tolerance of the simulated optical fiber coordinate position, three axes are respectively as follows: x axle 148um, Y axle 191um, Z axle 40um, combine two to know, under the condition that lens 1 exists and does not exist, optic fibre optical axis direction Z value difference is the key, and XY direction difference is less can be ignored. For different channels, the optical paths are different, and the Z values in the optical axis direction are different, for example, in simulation, the Z difference in the CH1 direction is 1221um, the Z difference in the CH2 direction is 561um, the Z difference in the CH3 direction is 280um, and the Z difference in the CH4 direction is 203 um. In this example, two difference values in the middle of four channels can be selected, and then the final defocus displacement value and defocus direction are determined, and in this example, the coordinate position difference value 280 is selected as the defocus displacement value of the optical fiber.
In order to verify the feasibility of the invention, the present example is verified by an actual comparison experiment, in the actual coupling, when the lens 1 does not exist, the optical power coupling itself is small, if the optical power is too small due to the large-range defocusing, the coupling cannot be performed, the experiments of different defocusing values of the Z axis 100, 200 and 280 are set near the simulated defocusing amount in the optical axis direction of CH3, when the lens 1 does not exist, the coupling lens 2 and the optical fiber move the Z axis according to the different defocusing values after reaching the maximum optical power, and the lens 2 and the optical fiber are fixed after coupling XY to the maximum optical power. And after the lens 2 and the optical fiber are fixed, continuing to couple the lens 1 of 4 channels to the maximum optical power Po and recording the specific optical power value (Po). The experimental data are shown in Table 2:
TABLE 2
The optical power (Po) is distributed in 3000uW to 6000uW when the optical fiber is coupled to the optimal optical path lens 1, the lens 2 and the optical fiber. From experimental data, when the Z defocus value is 100um and 200um, the optical power of a part of channels does not reach the optimum power point. When the Z-direction defocusing displacement value is 280um, the optical power can reach the optimal power point, and the optical power among channels is more balanced. Therefore, the experiment can verify that the technical scheme is feasible and approaches the practical situation.
The above-described embodiments are intended to be illustrative, and not restrictive, of the invention, and all changes that come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Claims (5)
1. A fast coupling method of a high-speed optical device is characterized by comprising the following steps:
the method comprises the following steps: before coupling, obtaining a Z-direction position coordinate difference value of optical fiber coupling in the presence and absence of a first collimating lens through simulation and/or a comparison experiment, and determining an out-of-focus displacement value and an out-of-focus direction of the optical fiber;
step two: under the condition that a first collimating lens close to the laser is not placed, coupling and fixing a second collimating lens close to the receiving end of the optical fiber according to the optical power;
step three: coupling the optical fiber and determining the position of the optical fiber when the optical power is maximum;
step four: moving the optical fiber in the Z-axis direction according to the defocusing displacement value and the defocusing direction in the first step, then coupling the XY position of the optical fiber until the optical power is maximum, and fixing the optical fiber;
step five: a first collimating lens coupled and fixed in turn for each channel.
2. The method of claim 1, wherein the method comprises: in the second-fifth step, in the process of coupling the second collimating lens and the optical fiber, the method also comprises a step of responding to the current value.
3. The method of claim 2, wherein the method comprises: the method for improving the response current value comprises the following steps: the optical power is increased at the transmitting TX end by increasing the laser drive current or by adding a semiconductor optical amplifier in the optical path, and the input optical power is increased at the receiving RX end.
4. A method of fast coupling of a high speed optical device according to any of claims 1-3, characterized by: in the first step, through a simulation experiment, the difference of Z coordinate values of the second collimating lens when the optical power of each channel reaches the maximum value under the condition that the first lens exists or does not exist is obtained, and finally the defocusing amount of the second collimating lens in the Z direction is determined according to the difference value of each channel.
5. The method of claim 4, wherein the method comprises: and the method also comprises an actual contrast experiment, the defocusing amount is verified through the actual contrast experiment to obtain the optimal defocusing amount, and the final position of the optical fiber coupling is confirmed according to the optimal defocusing amount.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114200606A (en) * | 2021-12-13 | 2022-03-18 | 东莞铭普光磁股份有限公司 | Rapid coupling light finding method and system for laser |
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| JPH04157406A (en) * | 1990-10-22 | 1992-05-29 | Nippon Telegr & Teleph Corp <Ntt> | Fixing method for light coupling system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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