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CN-122027033-A - Optical communication transmitting head and light spot optimization method

CN122027033ACN 122027033 ACN122027033 ACN 122027033ACN-122027033-A

Abstract

The invention discloses an optical communication emission head and an optical spot optimization method, which relate to the technical field of optical spot optimization, and the method comprises the steps of obtaining a pre-shaped light source, and simultaneously, carrying out electroplating polishing treatment on the surface of an inner cavity of an optical communication emission shell to form a closed reflection light path cavity; the method comprises the steps of arranging a converging lens and a focusing lens in sequence in the light emitting direction of a light source, carrying out integrated thermal coupling connection on a mounting base of the light source and the converging lens and an optical communication emission shell through a heat conducting medium to form a continuous heat conducting path from inside to outside, axially adjusting the relative distance between the converging lens and the focusing lens according to the size and energy distribution requirements of target light spots, and carrying out actual measurement verification on output light spots on the light emitting side of the focusing lens until the size and uniformity of the output light spots at the target distance meet preset communication receiving requirements. The invention solves the problems of low light energy utilization rate and poor light spot quality of the optical communication transmitting head in the prior art.

Inventors

  • ZHOU JIE
  • LI ZHONGCHUAN

Assignees

  • 深圳市星标电子科技有限公司

Dates

Publication Date
20260512
Application Date
20260331

Claims (10)

  1. 1. The light spot optimizing method for the optical communication transmitting head is characterized by comprising the following steps of: Step S1, a pre-shaped light source is obtained, and meanwhile, electroplating and polishing treatment is carried out on the surface of an inner cavity of an optical communication emission shell to form a closed type reflection light path cavity; Step S2, a converging lens and a focusing lens are sequentially arranged in the light emitting direction of the light source, wherein the converging lens is used for carrying out primary converging on the light beam emitted by the light source from the pre-shaping, and the focusing lens is used for carrying out secondary shaping and collimation on the light beam which is converged by the converging lens for the first time; s3, carrying out integrated thermal coupling connection on the light source and the mounting base of the converging lens and the optical communication emission shell through a heat conducting medium to form a continuous heat conducting path from inside to outside; And S4, axially adjusting the relative distance between the converging lens and the focusing lens according to the target spot size and the energy distribution requirement, and carrying out actual measurement verification on the output light spot on the light emergent side of the focusing lens until the size and uniformity of the output light spot at the target distance simultaneously meet the preset communication receiving requirement.
  2. 2. The method for optimizing a light spot of an optical communication transmitting head according to claim 1, wherein said obtaining a pre-shaped light source comprises: Selecting an LED or a laser diode with preset directivity distribution as an initial light source; And integrating a lens array on the light emergent surface of the light source or arranging an annular limiting diaphragm on the periphery of the light source, so that the full width half maximum divergence angle of the light source is compressed to be less than 60 degrees, and the pre-shaped light source is formed.
  3. 3. The method for optimizing a light spot of an optical communication transmitting head according to claim 1 or 2, wherein the electroplating and polishing process is performed on the surface of the inner cavity of the optical communication transmitting shell to form a closed type reflective light path cavity, comprising: depositing a metal reflecting layer on the surface of the inner cavity of the optical communication emission shell through a vacuum coating process or an electroless plating process; And carrying out surface polishing treatment on the metal reflecting layer to ensure that the spectral reflectivity of the polished metal reflecting layer in the visible light to near infrared band is not lower than 85 percent, thereby forming the closed type reflecting light path cavity.
  4. 4. The method according to claim 1, wherein in the step S2, the converging lens is a PMMA lens having an aspherical profile, and a relationship between a focal length f 1 of the converging lens and a distance d 1 between a light emitting surface of the light source and an incident surface of the converging lens satisfies a first relationship of 0.8< d 1 /f 1 <1.2; The focusing lens is made of a resin material with an adjustable refractive index, and the focal length f 2 of the focusing lens is preset by a second relational expression E d =k*(f 2 /f 1 ), wherein E d is a target light spot size, and k is a constant related to the light source size.
  5. 5. The method according to claim 4, wherein the optical axis of the converging lens and the optical axis of the focusing lens are arranged coaxially, and the axial distance Δl between the optical axis of the converging lens and the optical axis of the focusing lens is adjusted in a range satisfying a third relation of 0.5f 1 ≤ΔL≤2f 1 .
  6. 6. The method for optimizing a light spot of an optical communication transmitting head according to claim 1, wherein the step S3 comprises: Step S31, carrying out surface planarization treatment on a target contact surface between the mounting base of the light source and the optical communication emission shell; step S32, coating or filling the heat-conducting medium with preset thickness on the target contact surface subjected to the flattening treatment; and step S33, the mounting base coated with the heat conducting medium and the optical communication emission shell are pressed and fixed to finish the integrated thermal coupling connection.
  7. 7. The method for optimizing a light spot of an optical communication transmitting head according to claim 6, wherein the heat conducting medium is a heat conducting silicone grease, a heat conducting spacer or a phase change heat conducting material having a heat conductivity of not less than 3W/(m·k).
  8. 8. The method for optimizing a light spot of an optical communication transmitting head according to claim 1, wherein the step S4 comprises: Step S41, setting a light spot analyzer at a target communication distance preset on the light emitting side of the focusing lens, collecting light spot images in real time and analyzing the light intensity distribution of the light spot images; Step S42, calculating to obtain the light spot uniformity U according to a central light intensity value I c and an edge area average light intensity value I e fed back by the light spot analyzer, wherein U=I e /I c ; Step S43, comparing the light spot uniformity U with a preset target uniformity range, and simultaneously measuring light spot sizes D x and D y, in the orthogonal direction to obtain a comparison result and a measurement result; and S44, analyzing the comparison result and the measurement result, and judging that the optimization is completed when the light spot uniformity U is in the target uniformity range and the deviation between the light spot size and the target light spot size is smaller than a design threshold value.
  9. 9. The method for optimizing a spot of an optical communication transmitting head according to claim 8, further comprising, between said step S43 and said step S44: And analyzing according to the comparison result and the measurement result, if the light spot uniformity U is not in the target uniformity range or the deviation of the light spot size and the target size exceeds a design threshold, adjusting the axial distance delta L between the converging lens and the focusing lens, and returning to the step S41 for iterative verification.
  10. 10. An optical communication transmitting head, a light spot optimizing method using the optical communication transmitting head according to any one of claims 1 to 9, comprising: A light source assembly comprising a pre-shaped light source; the optical communication transmitting shell is provided with an inner cavity, and the surface of the inner cavity is subjected to electroplating polishing treatment to form a closed type reflecting light path cavity for accommodating and reflecting the light beam emitted by the light source which is preformed; The lens group is arranged in the light emitting direction of the light source assembly and is positioned in the optical communication emission shell, wherein the lens group comprises a converging lens and a focusing lens which are sequentially arranged along a light path, the converging lens is used for carrying out primary convergence on the light beam from the pre-shaped light source, and the focusing lens is used for carrying out secondary shaping and collimation on the light beam converged by the converging lens; The heat conduction coupling structure comprises a mounting base and a heat conduction medium, wherein the mounting base is used for bearing the light source assembly and the converging lens and is in integrated heat coupling connection with the inner wall of the optical communication emission shell through the heat conduction medium to form a continuous heat conduction path from the light source assembly to the outside of the optical communication emission shell; the axial distance between the converging lens and the focusing lens is configured according to the size of the target light spot and the energy distribution requirement, and the size and uniformity of the output light spot at the target distance can meet the preset communication receiving requirement simultaneously through actually measuring and verifying the output light spot at the light emitting side of the focusing lens.

Description

Optical communication transmitting head and light spot optimization method Technical Field The invention relates to the technical field of light spot optimization, in particular to an optical communication emission head and a light spot optimization method. Background Optical communication technology, especially underwater wireless optical communication, is an important solution for underwater high-speed data transmission due to its high bandwidth, low delay and strong confidentiality. The performance of the optical communication transmitting head as the core optical front-end of the system directly determines the reliability and effectiveness of the communication link. An ideal emitter should output a laser beam with concentrated energy, uniform light spot and controllable divergence angle under the condition of limited volume and power consumption, and maintain good thermal stability. In the prior art, a Laser Diode (LD) or a Light Emitting Diode (LED) is mostly used as a light source for an optical communication transmitting head, and a lens group consisting of a collimating lens and a shaping lens is provided for adjusting and controlling an optical beam. However, for volume control, the internal space of the optical communication emitter is extremely compact. The traditional single collimating lens is difficult to realize good beam shaping in a short optical path, and is easy to cause overlarge beam divergence angle. Part of the light energy can directly overflow or irradiate the non-working area in the transmission process, so that the light energy is wasted. Meanwhile, the problem that the output light spot is too strong in central energy, too fast in edge attenuation, irregular in light spot shape and the like can be caused by the non-ideal light beam shaping, so that the uniformity and the effective irradiation range of the light spot are reduced, and the signal receiving quality of a receiving end is influenced. Therefore, the optical communication transmitting head in the prior art has the problems of low light energy utilization rate and poor light spot quality. Disclosure of Invention The invention aims to provide an optical communication transmitting head and a light spot optimizing method, which solve the problems of low light energy utilization rate and poor light spot quality of the optical communication transmitting head in the prior art. To achieve the purpose, the invention adopts the following technical scheme: according to a first aspect, the present invention provides a method for optimizing a light spot of an optical communication transmitting head, including: Step S1, a pre-shaped light source is obtained, and meanwhile, electroplating and polishing treatment is carried out on the surface of an inner cavity of an optical communication emission shell to form a closed type reflection light path cavity; Step S2, a converging lens and a focusing lens are sequentially arranged in the light emitting direction of the light source, wherein the converging lens is used for carrying out primary converging on the light beam emitted by the light source from the pre-shaping, and the focusing lens is used for carrying out secondary shaping and collimation on the light beam which is converged by the converging lens for the first time; s3, carrying out integrated thermal coupling connection on the light source and the mounting base of the converging lens and the optical communication emission shell through a heat conducting medium to form a continuous heat conducting path from inside to outside; And S4, axially adjusting the relative distance between the converging lens and the focusing lens according to the target spot size and the energy distribution requirement, and carrying out actual measurement verification on the output light spot on the light emergent side of the focusing lens until the size and uniformity of the output light spot at the target distance simultaneously meet the preset communication receiving requirement. Optionally, the obtaining a pre-shaped light source includes: Selecting an LED or a laser diode with preset directivity distribution as an initial light source; And integrating a lens array on the light emergent surface of the light source or arranging an annular limiting diaphragm on the periphery of the light source, so that the full width half maximum divergence angle of the light source is compressed to be less than 60 degrees, and the pre-shaped light source is formed. Optionally, the electroplating polishing treatment is performed on the surface of the inner cavity of the optical communication transmitting shell to form a closed reflection light path cavity, which comprises: depositing a metal reflecting layer on the surface of the inner cavity of the optical communication emission shell through a vacuum coating process or an electroless plating process; And carrying out surface polishing treatment on the metal reflecting layer to ensure that the spectral reflectivity o