Simple modulation method for generating low-polarization light source and depolarization light source in any proportion by using polarization-maintaining chip

Abstract

The invention relates to the technical field of light source modulation, in particular to a simple modulation method for generating a low-polarization light source and a depolarization light source in any proportion by using a polarization-maintaining chip, which comprises the following steps: S1, an optical chip emits high-polarization light, the high-polarization light is collimated into parallel light through a lens 1, two paths of light are formed through a beam splitter, one path of light passes through a half slide after passing through the beam splitter, and the other path of light passes through a half slide after passing through a half slide; at the moment, p light is changed into s light, one path of light is reflected by the surface of a beam splitter and a reflecting prism, two paths of light are combined by a PBS beam combining surface, then pass through an optical isolator and are focused by a lens 2, finally low-polarization light is input and enters an optical fiber, a quarter-glass slide and a reflecting mirror in an original light path are simplified to be placed into a half-glass slide, PBS1 and PBS2 are synthesized into one PBS, and the PBS is used as a light source. And meanwhile, the half slide is integrated with the PBS, so that the optical path is simplified, the coupling process flow is simplified, the overall integration level of the device is improved, and the device adapts to the trend of packaging miniaturization.

Description

Technical Field

[0001] The present invention relates to the technical field of light source modulation, and in particular to a modulation method for simply utilizing a polarization-maintaining chip to generate a low-polarization light source and a depolarized light source in any proportion. Background Art

[0002] Generally, chips output polarization-maintaining light, which has a polarization state in only one direction. Some applications require light with two polarization directions as a light source. For SLD chips in the 1550nm band, it is impossible to directly output light with two polarization states. Therefore, it is necessary to use a single-polarization chip on the package to make a non-polarized device to output a low-polarization light source. The optical path structure designed in the early stage is relatively complex, and the quarter glass slide and reflector increase the difficulty of the process.

[0003] At the same time, the existing modulation method of the depolarization light source still has operational deficiencies. Specifically, the process flow of the existing modulation method of the depolarization light source is relatively complex, the overall integration of the device is low, and it cannot meet the requirements of miniaturization of packaging.

[0004] Therefore, a modulation method for generating a low-polarization light source and a depolarization light source in any proportion by simply utilizing a polarization-maintaining chip is needed to solve the problems raised in the above background technology. Summary of the Invention

[0005] The object of the present invention is to provide a modulation method for generating a low-polarization light source and a depolarization light source of arbitrary proportions by simply utilizing a polarization-maintaining chip, so as to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A simple modulation method for generating a low-polarization light source and a depolarization light source of arbitrary proportions using a polarization-maintaining chip includes the following steps:

[0008] S1: The optical chip emits highly polarized light, which is collimated into parallel light by lens 1 and forms two light paths through the beam splitter. One light path passes through the beam splitter and passes through half of the glass slide, at which point the p light becomes s light. The other light path is reflected by the beam splitter surface and the reflecting prism. The two light paths are combined by the PBS beam combining surface, pass through the optical isolator, and then focus through lens 2. Finally, the low-polarized light is input into the optical fiber;

[0009] S2, the optical chip emits highly polarized light, which is collimated into parallel light by lens 1. A thin half-length glass slide is inserted after the collimated light path, so that the upper half of the light spot is converted into s light, while the lower half remains p light. The modulated light passes through the optical isolator and then focused by lens 2, finally inputting low-polarized light into the optical fiber;

[0010] S3: The optical chip emits highly polarized light, which is collimated into parallel light by lens 1 and passes through a half-glass slide with a size smaller than the spot diameter. The light passing through the half-glass slide is converted into s-light, while the light outside the half-glass slide remains p-light. The modulated light passes through the optical isolator and then focused by lens 2, finally inputting low-polarized light into the optical fiber;

[0011] S4, the optical chip emits highly polarized light, which is collimated into parallel light by lens 1. After passing through the depolarizer, the output beam is depolarized light. After passing through the optical isolator and focusing by lens 2, the depolarized light is finally input into the optical fiber.

[0012] As a preferred solution of the present invention, the highly polarized light is P light, and the low polarized light is P light+S light.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] 1. In the present invention, the optical path is simplified by simplifying the quarter glass slide and reflector in the original optical path to a half glass slide, combining PBS1 and PBS2 into a single PBS, and integrating the half glass slide with the PBS. This simplifies the optical path and the coupling process flow. The angle of the half glass slide can be rotated to produce different proportions of S light, thereby modulating the polarization state of the light. The polarization state of the light can also be adjusted by adjusting the height of the half glass slide inserted into the optical path. This simplifies the optical path and coupling process flow, improves the overall integration of the device, and adapts to the trend of miniaturization of packaging. For highly polarized light, after being collimated into parallel light by a lens, it is directly converted into depolarized light by a depolarizer, is focused by an optical isolator and a lens, and is ultimately input into an optical fiber. This simplifies the overall optical path of the modulated depolarized light, greatly improving the system integration level, meeting the requirements of the existing technology for miniaturized packaging, and improving the adaptability of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 Schematic diagram of the optical path principle in step S1 of the present invention;

[0016] Figure 2 Schematic diagram of the optical path principle in step S2 of the present invention;

[0017] Figure 3 Schematic diagram of the optical path principle in step S3 of the present invention;

[0018] Figure 4 Schematic diagram of the optical path principle in step S4 of the present invention. DETAILED DESCRIPTION

[0019] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0020] To facilitate understanding of the present invention, the present invention will be described more comprehensively below with reference to the relevant drawings, and several embodiments of the present invention are given. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive.

[0021] It should be noted that when an element is referred to as being "fixed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used in this article are for illustrative purposes only.

[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which the present invention pertains. The terms used in the specification of the present invention are for the purpose of describing specific embodiments only and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0023] For examples, see Figure 1-4 , the present invention provides a technical solution:

[0024] A simple modulation method for generating a low-polarization light source and a depolarization light source of arbitrary proportions using a polarization-maintaining chip includes the following steps:

[0025] S1: The optical chip emits highly polarized light, which is collimated into parallel light by lens 1 and forms two light paths through the beam splitter. One light path passes through the beam splitter and passes through half of the glass slide, at which point the p light becomes s light. The other light path is reflected by the beam splitter surface and the reflecting prism. The two light paths are combined by the PBS beam combining surface, pass through the optical isolator, and then focus through lens 2. Finally, the low-polarized light is input into the optical fiber;

[0026] S2, the optical chip emits highly polarized light, which is collimated into parallel light by lens 1. A thin half-length glass slide is inserted after the collimated light path, so that the upper half of the light spot is converted into s light, while the lower half remains p light. The modulated light passes through the optical isolator and then focused by lens 2, finally inputting low-polarized light into the optical fiber;

[0027] S3: The optical chip emits highly polarized light, which is collimated into parallel light by lens 1 and passes through a half-glass slide with a size smaller than the spot diameter. The light passing through the half-glass slide is converted into s-light, while the light outside the half-glass slide remains p-light. The modulated light passes through the optical isolator and then focused by lens 2, finally inputting low-polarized light into the optical fiber;

[0028] S4, the optical chip emits highly polarized light, which is collimated into parallel light by lens 1. After passing through the depolarizer, the output beam is depolarized light. After passing through the optical isolator and focusing by lens 2, the depolarized light is finally input into the optical fiber.

[0029] As a preferred solution of the present invention, the highly polarized light is P light, and the low polarized light is P light+S light.

[0030] The working process of the present invention is as follows: the optical chip emits highly polarized light, which is collimated into parallel light by lens 1 and forms two light paths through the beam splitter. One light path transmits through the beam splitter and passes through half of the glass slide, at which point the p light becomes s light. The other light path is reflected by the surface of the beam splitter and the reflecting prism. The two light paths are combined by the PBS beam combining surface, pass through the optical isolator, and then focus through lens 2, and finally input low-polarized light into the optical fiber.

[0031] The chip emits highly polarized light, which is collimated into parallel light by lens 1. A thin half-length glass slide is inserted after the collimated light path, so that the upper half of the light spot is converted into s light, while the lower half remains p light. The modulated light passes through the optical isolator and then focused by lens 2, and finally inputs low-polarized light into the optical fiber;

[0032] The optical chip emits highly polarized light, which is collimated into parallel light by lens 1 and then passes through a half-glass slide that is smaller than the spot diameter. The light passing through the half-glass slide is converted into s-light, while the light outside the half-glass slide remains p-light. The modulated light passes through the optical isolator and then focused by lens 2, finally inputting low-polarized light into the optical fiber.

[0033] The optical chip emits highly polarized light, which is collimated into parallel light by lens 1. After passing through the depolarizer, the output beam is depolarized light. After passing through the optical isolator and focusing by lens 2, the depolarized light is finally input into the optical fiber.

[0034] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A simple modulation method for generating a low-polarization light source and a depolarization light source of arbitrary proportions using a polarization-maintaining chip, characterized in that: The following steps are involved: S1: The optical chip emits highly polarized light, which is collimated into parallel light by lens 1 and forms two light paths through the beam splitter. One light path passes through the beam splitter and passes through half of the glass slide, at which point the p light becomes s light. The other light path is reflected by the beam splitter surface and the reflecting prism. The two light paths are combined by the PBS beam combining surface, pass through the optical isolator, and then focus through lens 2. Finally, the low-polarized light is input into the optical fiber; S2, the optical chip emits highly polarized light, which is collimated into parallel light by lens 1. A thin half-length glass slide is inserted after the collimated light path, so that the upper half of the light spot is converted into s light, while the lower half remains p light. The modulated light passes through the optical isolator and then focused by lens 2, finally inputting low-polarized light into the optical fiber; S3: The optical chip emits highly polarized light, which is collimated into parallel light by lens 1 and passes through a half-glass slide with a size smaller than the spot diameter. The light passing through the half-glass slide is converted into s-light, while the light outside the half-glass slide remains p-light. The modulated light passes through the optical isolator and then focused by lens 2, finally inputting low-polarized light into the optical fiber; S4, the optical chip emits highly polarized light, which is collimated into parallel light by lens 1. After passing through the depolarizer, the output beam is depolarized light. After passing through the optical isolator and focusing by lens 2, the depolarized light is finally input into the optical fiber.

2. The method for generating a low-polarization light source and a depolarization light source in any proportion by using a polarization-maintaining chip according to claim 1, characterized in that: The high polarization light is P light, and the low polarization light is P light+S light.

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