TWI434093B - Fiber module structure - Google Patents

Description

Fiber module structure

The invention provides a fiber optic module structure, in particular, a plurality of grooves are arranged on the substrate for the fiber to be positioned, and the cover plate is brought into contact with the top edge of the plurality of fibers to form a contact positioning state, and the cover plate can be matched with the substrate. The length is shortened to reduce the difficulty in manufacturing the positioning groove, and the material can be saved at a lower cost, and the quality and stability of the optical signal transmission are ensured.

According to the current rapid development of communication technology and the Internet, and the erection of communication devices such as telephones and networks, the distance between people is getting closer and closer, and the transmission of communication equipment is to transmit electrical signals or optical signals through cables. As a signal transmission line, the optical signal transmission method is the fastest, and the optical signal transmission medium is a fiber optic (Fiber Optics) cable, and has a strong anti-electromagnetic and noise interference capability, and a high bandwidth and weight. Lightweight, signal transmission distance and good confidentiality, so the optical fiber has gradually replaced the traditional metal transmission line.

Furthermore, the basic structure of optical fiber communication is that the transmission end converts the electrical signal into an optical signal, and transmits the optical signal to the receiving end through the optical fiber, and the receiving end also needs to convert the optical signal into an electrical signal to provide the receiving device at the receiving end. As the transmission bandwidth increases and more channel requirements, high optical coupling ratio fiber arrays are the best choice, and Fiber Array is an important component for fiber optic and mating device connection, mainly used for planar optical waveguides. (PLC), dense wavelength division multiplexing system (DWDM), optical cross-connect (OXC), optical add/drop multiplexer (OADM), optical router, optical switch and other devices connected to the optical fiber, generally in the configuration of the optical fiber array The fiber array (Fiber Array) and the laser diode array (LD Array) are aligned and joined, that is, the position of the laser diode array and the fiber array maximum optical coupling ratio must be searched for alignment. In order to facilitate the subsequent bonding process; the other way is that the optical fiber array does not need to perform the optical coupling position alignment before the bonding, and the construction yield mainly depends on the designed positioning between the optical fiber array and the substrate. (such as gluing, soldering or laser welding), so the pre-alignment action is omitted.

The substrate used in the conventional optical fiber array is mostly a V-shaped glass substrate, and the plurality of optical fibers are respectively accommodated in the V-shaped groove, so that the direction of the optical fiber can be positioned by the V-shaped groove to ensure the direction of the optical fiber. The accuracy of the fiber alignment, and the method of forming the groove is to cut the V-shaped groove on the flat glass substrate by the cutter, which is not only time-consuming, but also easily causes damage to the structure of the glass substrate, so that the practitioner uses the lithography etching. The process of making trenches can achieve the precision and miniaturization effect of the substrate, but this method is more suitable for the fiber array module with the wafer as the substrate, and the complicated process, material limitation and high cost are also It causes bottlenecks in its application, is not easy to meet the requirements of rapid mass production and cost reduction, and will pollute the environment and be less environmentally friendly. With the continuous advancement of materials technology, the industry has developed a new glass material and plastic materials. It is produced by compression molding or injection molding, which can reduce the substrate production time and is suitable for mass production, but the substrate and its heat transfer are easy to occur during the bonding process of the adhesive. Deformation caused by shrinkage or expansion stress, so that the fiber produces a six-degree-of-freedom shift, which not only affects the yield of the fiber array module, but also allows the optical signal passing through it to be at the same point in the center of the fiber. The rendezvous leads to the occurrence of mutual interference or loss of more insertion loss between the optical signals.

Looking at the above-mentioned shortcomings, if the design of the manufacturing, the number of optical fibers, and the accuracy of the mounting on the optical fiber array can be designed, the overall processing and manufacturing cost, and more requirements for fiber setting and assembly accuracy can be met. The application of actual fiber arrays is the direction that those who are still in the industry want to study and improve.

Therefore, the inventors have drawn up the problems and shortcomings in the use of optical fiber arrays. They have collected relevant data and evaluated them through various parties, and have tried and modified them with many years of research and development experience in this industry. The invention patent was born.

The main purpose of the present invention is that the abutting surface of the cover plate is clamped against the top edge of the optical fiber cable, and the two contact surfaces of the plurality of optical fibers respectively on the mating surface of the substrate and the abutting surface of the cover plate are A three-point or three-point contact positioning state is formed, and a glue is integrally formed between the substrate, the optical fiber cable and the cover plate by curing with an adhesive. The length of the cover plate can be between 2.6 and 2.0 mm, not only The length of the positioning groove which can be matched with the substrate is shortened, the difficulty in processing and manufacturing the positioning groove can be reduced, and the cover material is effectively saved, and the cost is lower, so as to reduce light loss, phase noise and crosstalk, and Improve its optical coupling rate to ensure the quality and stability of optical signal transmission.

The secondary object of the present invention is that the colloid is an adhesive having high fluidity and low viscosity, which is formed to facilitate penetration between the positioning groove of the substrate, the optical fiber of the optical fiber cable and the abutting surface of the cover plate. The hard rubber layer and the bonding strength thereof are improved, and the adhesive layer with low fluidity and high viscosity can be used on the coating layer behind the positioning groove of the substrate and on the outer layer of the plurality of optical fibers, and the elastic preload force is appropriate, and Prevent any deviation during the bonding process, so as to facilitate the alignment of the optical fiber cable, and form a soft rubber layer after curing, and the soft rubber layer can be easily formed into an arch shape for sealing. The glue fills the space formed by the high and low drop behind the substrate and the cover, and increases the angle at which the end of the optical fiber cable can be bent to reduce the occurrence of breakage.

In order to achieve the above objects and effects, the technical means and the configuration of the present invention will be described in detail with reference to the preferred embodiments of the present invention.

Please refer to the first, second, third and fourth figures, which are respectively a partial enlarged view of a plan view, a side view, a front view and a third view of the present invention. As is clear from the figure, the present invention includes a substrate. 1. The optical fiber cable 2 and the cover plate 3, so the main components and features of the present invention are as follows, wherein: the surface of the substrate 1 has an abutting surface 11, and the high-precision machining method can be used on the abutting surface 11 The longitudinal recess is provided with a plurality of positioning grooves 12 which are wavy, serrated, or continuous, non-continuous parallel arrangement or a combination thereof, and each positioning groove 12 can be a V-Groove, a taper. Or other grooves having a width and a narrow width and having a predetermined angle α of 60±1.0 between the contact faces 121 formed at the inner wall surfaces of the two sides of the positioning groove 12.

The optical fiber cable 2 has a plurality of optical fibers 21, and one or more optical fibers 21 are laterally positioned in the corresponding positioning grooves 12 of the substrate 1. The optical fiber 21 can be a glass fiber with a standard diameter of 125 μm, and a plastic sleeve fiber. Or plastic optical fiber, and can be divided into single mode or multimode fiber according to transmission mode, wherein multimode fiber can be generally divided into step fiber and graded fiber according to different refractive index profile; in addition, in order to solve fiber 21 dispersion and Polarization-shifting fibers, non-zero dispersion-shifted fibers, dispersion-compensating fibers, and Polarization Maintaining Fibers (PMFs) are also used for different purposes such as polarization changes.

The cover plate 3 is located above the substrate 1 and has a flat abutting surface 31. The width L of the cover plate 3 can be 5.0±0.2 mm, and the length W of the cover plate 3 can be 2.6-2.0 mm. between.

Furthermore, the abutting surface 11 of the substrate 1 can be formed by wavy, jagged, equidistant or non-equidistant continuous parallel arrangement by means of micro-milling, cutting, grinding or other high-precision machining (Hight Precision Machining) or The combination of the plurality of positioning grooves 12 can be processed to a sub-micron (i.e., 1 micron = 10 ^-6 m = 1 μm) level to obtain precise dimensions and surface roughness, and the mating surface 11 of the substrate 1 is The adhesive can be applied by coating, molding or dispensing, and the plurality of optical fibers 21 having the stripped layer of the optical fiber cable 2 are respectively placed in the positioning groove 12 of the substrate 1 to be preset. After the positioning, the abutting surface 31 of the cover 3 is clamped downward to the top edge of the plurality of optical fibers 21, and a predetermined spacing A of 30 μm is formed between the mating surface 31 of the plurality of optical fibers 21 and is to be continued. After the agent is cured, the integrally formed colloid 4 can be firmly joined by the adhesive curing.

However, one or more of the above-mentioned optical fiber cables 2 form three or more points between the two contact faces 121 of the positioning grooves 12 of the substrate 1 and the abutting faces 31 of the cover plates 3, respectively. Holding the contact and presenting the pinch positioning state, and the center distances (Core Pitch) of the two adjacent optical fibers 21 are closer to each other, and can be mutually contacted or separated to form a fine pitch to prevent the offset of the plurality of optical fibers 21, that is, The accuracy of positioning the optical fiber cable 2 on the substrate 1 can be accurately controlled, so that it does not require too much man-hours for alignment, thereby saving manufacturing man-hours and costs, and increasing the number of optical fibers 21 according to requirements or designs. Under the predetermined size specifications of the substrate 1 and the cover 3, the overall spatial configuration of the optical fiber cable 2 can be properly arranged to effectively solve the transmission caused by the insufficient number of transmission channels or the need to occupy a large space height. The bandwidth is limited and the volume cannot be reduced, so that the number of the optical fibers 21 of the optical fiber cable 2 can be increased and the density is increased, and the overall volume is further miniaturized.

In addition, the substrate 1 and the cover plate 3 are respectively heat-resistant glass [such as Pyrex Glass (linear thermal expansion coefficient 32.5x10 ^-7 / ° C), boron bismuth glass (Borofloat 33, linear thermal expansion coefficient 3.3x10 ^-6 / ° C), Schott borosilicate glass (BK7, linear thermal expansion coefficient 86x10 ^-7 / ° C)], quartz glass (Quartz Glass, linear thermal expansion coefficient 5.5 ~ 5.9x10 ^-7 / ° C), single crystal germanium (Monocrystalline Silicon ), polycrystalline silicon wafer or other hard material with high temperature resistance and low thermal expansion coefficient, and can be divided into light transmissive or opaque materials according to transparency, while substrate 1 and cover 3 can be made of transparent material. (such as heat-resistant glass, quartz glass, etc.) is adhered to the optical fiber cable 2 by an adhesive, and the adhesive may be a photo-curable resin (PMMA, commonly known as acrylic resin). Glue), epoxy resin (Epoxy), phenolic resin, inorganic adhesive, anoxic rubber, thermoplastic polyurethane (TPU), pressure sensitive adhesive, hot melt adhesive or a combination thereof.

Since the fluidity of the colloid 4 and the working time are related to the quality of the bonding and the bonding strength, if the adhesive has high fluidity and low viscosity, it can facilitate penetration into the positioning groove 12 of the substrate 1 and improve the bonding strength, but It is also often caused to overflow or cause damage or damage to the cement. If the fluidity of the adhesive is low and the viscosity is high, the adhesive is difficult to be bonded. Therefore, the colloid 4 of the present invention is available light. The adhesive of the cured resin (UV adhesive) has high fluidity and low viscosity, and can easily penetrate into the positioning groove 12 of the substrate 1, the plurality of optical fibers 21 of the optical fiber cable 2 and the abutting surface 31 of the cover 3, and then pass ultraviolet rays. The light source device is irradiated in a few seconds (for example, 1 to 60 seconds) to form a hard rubber layer 41 after rapid curing, and the bonding strength thereof is increased, and the plurality of optical fibers 21 located behind the positioning groove 12 of the substrate 1 and the optical fiber cable 2 are irradiated. On the outer coating layer, the epoxy resin adhesive can be used with low fluidity, high viscosity and appropriate elastic preload force, and can prevent any deviation during the bonding process, so that the optical fiber cable 2 can be used. Quasi, and in a few minutes (such as 2 ～8 minutes) After the curing is completed, the soft rubber layer 42 is formed, and the soft rubber layer 42 can be easily formed into an arched shape, which is used for sealing the back of the substrate 1 and the cover plate 3 The space formed by the low drop is increased, and the angle at which the end of the optical fiber cable 2 can be bent is increased to reduce the occurrence of breakage.

If the substrate 1 and the cover 3 are opaque materials (such as single crystal germanium, polycrystalline silicon wafer, etc.), they can also be cured and bonded through an adhesive of an anoxic adhesive to completely seal the substrate 1 and the cover 3 The optical fiber module of the present invention is completed by the gap during the bonding and avoiding the accumulation of dust and impurities therein, and having the function of protecting the optical fiber cable 2 while ensuring the quality and stability of the optical fiber cable 2 optical signal transmission. The structure, and the fiber module structure can be polygonal, cylindrical or various other shapes, so that the end face treatment can be further polished by grinding to form an angle of 8 degrees, and coated or coated with an anti-reflective material on the end surface. The method is formed with an anti-reflection layer (AR Coating), that is, the optical interference principle can be used to filter the wavelength of the light (1260 nm to 1650 nm) through the anti-reflection layer to reduce the polarization dependence of the light (Polarization Dependent Loss, PDL). ) and increase its optical coupling ratio.

In the actual use of the optical fiber module structure of the present invention, the plurality of optical fibers 21 of the optical fiber cable 2 can be polarization maintaining optical fibers, and are mainly applied to the same dimming communication and optical fiber sensors, such as fiber optic gyroscopes, fiber-optic underwater acoustic wave sensors. If the core of the polarization-maintaining fiber is doped with erbium ions, it becomes a polarization-maintaining erbium-doped fiber, and can be applied to high-power fiber amplifiers, polarization-maintaining couplers, and fiber lasers. Refractive index, beat length, extinction ratio, etc., wherein the extinction ratio (ER) is defined as the value obtained by subtracting the maximum value and the minimum value of the optical modulation output, generally expressed in dB, and the extinction ratio The requirement must be greater than 20 dB to reduce the phase noise and crosstalk to the light and improve the sensitivity of the fiber sensor.

Therefore, in order to achieve the aforementioned effects, the inventors actually perform cutting, grinding or other high-precision machining for the standard length 5.0±0.5 mm of the cover plate 3, through many laborious experiments and tests, and according to the cover 3 The extinction ratio before the length is compared with the original value and the grinding length of 1 mm, the grinding length of 2 mm and the difference are actually measured, and the results as shown in Table 1 can be obtained. After the analysis and comparison, the length of the cover 3 can be clearly known. The difference between the extinction ratio and the extinction ratio before grinding is mostly positive and increasing. Only a few extinction ratios show a negative value, which means that the cover 3 can maintain good extinction after being shortened. The specific ratio (the ER value is >20 dB), and the length of the cover plate 3 is preferably between 2.6 and 2.0 mm. The structure of the cover plate 3 is such that the cover plate 3 can be matched with the substrate 1 at the abutting surface. The length of the plurality of positioning grooves 12 on the 11 is shortened, which not only reduces the difficulty in manufacturing the positioning groove 12, but also saves the materials for the cover 3 and the labor and cost of processing and manufacturing, and Can be refined within the limits of high precision machining itself The accuracy of positioning the optical fiber cable 2 on the substrate 1 ensures that the optical fiber 21 has a good extinction ratio, thereby effectively reducing light loss, phase noise and crosstalk, and improving the optical coupling ratio, thereby improving Process yield is suitable for mass production and ensures the quality and stability of optical signal transmission.

Referring to the first and third figures, the present invention is directed to the longitudinally concave recess 12 on the mating surface 11 of the substrate 1 and formed between the contact faces 121 at the inner wall surfaces of the two positioning grooves 12 . The predetermined angle α can be 60±1.0 degrees, and one or more optical fibers 21 of the optical fiber cable 2 are positioned in the positioning groove 12, and then the cover 3 is clamped to the top edge of the optical fiber cable 2. And a predetermined spacing A formed between the abutting faces 11 and 31 of the cover plate 3 and the substrate 1 may be 30 μm, and is integrally formed between the substrate 1, the optical fiber cable 2 and the cover plate 3 by curing with an adhesive. There is a colloid 4, the length of the cover plate 3 can be between 2.6 and 2.0 mm, so that the cover plate 3 can be shortened with the positioning groove 12 of the substrate 1, which not only reduces the difficulty in processing and manufacturing the positioning groove 12, but also effectively The utility model can save the cost of the cover plate 3 and is cheaper, and can accurately control the accuracy of positioning the optical fiber cable 2 on the substrate 1, and can also ensure a good extinction ratio to reduce light loss, phase noise and crosstalk. And improve the optical coupling ratio to ensure the quality and stability of the optical signal transmission, using the specification of the present invention and Simple modifications and equivalent structures changes formula whom content, should be included within the scope of patent empathy present invention, together to Chen.

In summary, the optical fiber module structure of the present invention can truly achieve its efficacy and purpose, so the invention is an invention with excellent practicability, and is in fact conforming to the application requirements of the invention patent, and submitting an application according to law, expecting the trial committee to be an early one. This case is given to protect the inventor's hard work. If there is any doubt in the bureau, please do not hesitate to give instructions. The inventor will try his best to cooperate with him.

1. . . Substrate

11. . . Docking surface

12. . . Positioning groove

121. . . Contact surfaces

2. . . Fiber optic cable

twenty one. . . optical fiber

3. . . Cover

31. . . Docking surface

4. . . colloid

41. . . Hard rubber layer

42. . . Soft rubber layer

The first figure is a top view of the invention.

The second figure is a side view of the invention.

The third figure is a front view of the invention.

The fourth figure is a partial enlarged view of the third figure of the present invention.

1. . . Substrate

2. . . Fiber optic cable

twenty one. . . optical fiber

3. . . Cover

4. . . colloid

42. . . Soft rubber layer

Claims (8)

An optical fiber module structure includes a substrate, a fiber optic cable and a cover plate, wherein: the substrate has a plurality of positioning grooves longitudinally recessed on the mating surface, and contacts are formed at the inner wall surfaces of the two sides of the positioning groove The fiber optic cable has a plurality of optical fibers, and the optical fibers are laterally positioned in the corresponding positioning grooves of the substrate; the cover plate is located above the substrate and has a flat shape that can be clamped to the top edge of the optical fiber cable. The butt joint has a width of 5.0±0.2mm and a length of 2.6-2.0mm, and is integrally formed with a colloid between the substrate, the optical fiber cable and the cover plate by curing with an adhesive, so that the optical fiber can be combined with The two contact faces of the positioning groove and the abutting faces of the cover plate form a three-point or three-point contact contact to exhibit a pinch-position state. The fiber optic module structure of claim 1, wherein the mating surface of the substrate is wavy, jagged, or continuous by micro-milling, cutting, grinding, or other high-precision machining. Non-continuous parallel arrangement or a combination of the plurality of positioning grooves, and the positioning groove may be a V-shaped groove, a cone or other groove type which is wide and narrow, and formed between the two contact faces The predetermined angle can be an angle of 60 ± 1.0 degrees. The fiber optic module structure of claim 1, wherein the predetermined spacing between the abutting faces of the substrate and the cover plate is 30 μm. The fiber optic module structure of claim 1, wherein the fiber of the fiber optic cable is a glass fiber, a rubber sleeve fiber or a plastic fiber having a diameter of 125 μm. The fiber optic module structure of claim 1, wherein the fiber of the fiber optic cable is a polarization maintaining fiber. The fiber optic module structure according to claim 1, wherein the substrate and the cover plate are respectively a single crystal germanium, a polycrystalline germanium wafer, and a Pyrex Glass (linear thermal expansion coefficient: 32.5 x 10 ^-7 / ° C) ), Quartz Glass (linear thermal expansion coefficient 5.5 ~ 5.9x10 ^-7 / ° C), Boron glass (Bo rofloat 33, linear thermal expansion coefficient 3.3x10 ^-6 / ° C), Schott borosilicate glass (BK7, It has a linear thermal expansion coefficient of 86x10 ^-7 /°C) or other hard materials with high temperature resistance and low thermal expansion coefficient. The optical fiber module structure according to claim 1, wherein the adhesive of the colloid may be a photo-hardening resin (UV adhesive) of polymethacrylate (PMMA), epoxy resin (Epoxy), phenolic resin, Inorganic adhesive, anoxic rubber, thermoplastic polyurethane (TPU), pressure sensitive adhesive, hot melt adhesive or a combination thereof. The optical fiber module structure according to claim 1, wherein the substrate, the optical fiber cable and the cover plate are cured by a photo-curable resin (UV adhesive) to form a hard rubber layer, and are located on the substrate. The soft groove layer is formed after the positioning groove and the fiber cable are cured by epoxy resin.