Modulation device for generating low-polarization light source in any proportion by utilizing polarization-maintaining chip

Abstract

The utility model relates to the technical field of communication, in particular to a modulation device for generating a low-polarization light source in any proportion by using a polarization-maintaining chip, which comprises a first lens, a beam splitter, a first polarization beam splitter, a quarter-wave slide, a reflector, a reflecting prism, a second polarization beam splitter, an optical isolator, a second lens and an optical fiber, according to the utility model, light splitting is carried out on the high-polarization light source through the light splitting plate, one path of light passes through the same one-fourth slide twice to realize polarization state change, then beam combination is carried out on the light in the original polarization state, and finally low-polarization light is generated; according to the utility model, the generation of S light with different proportions can be realized by rotating the angle of the quarter-wave plate, so that the modulation of the polarization state of the light is realized.

Description

TECHNICAL FIELD

[0001] The utility model relates to communication technical field, concretely is a kind of modulation device for generating arbitrary proportion low polarized light source using polarization maintaining chip. BACKGROUND

[0002] Optical chip is a kind of technical equipment that integrates optical elements onto a single chip, which uses photons (not electrons) for information transmission, processing and operation.

[0003] The principle of optical chip is based on photonics, that is, using the wave nature and particle nature of light to transmit and process information. Its working process can be divided into three main steps: light emission, light transmission and light detection.

[0004] Light emission: light source (such as laser or LED) converts electrical signal into optical signal. This process is usually realized by light emission through energy band transition of semiconductor material, for example, by doping specific elements to form quantum well structure on silicon substrate.

[0005] Light transmission: the optical signal generated by the light source is transmitted through waveguide. Waveguide uses total reflection of light to guide light inside the chip. The design of waveguide enables efficient transmission of optical signal inside the chip, while avoiding scattering and loss of optical signal. Interference between waveguides may occur, which is used in optical chip to realize signal modulation and amplification.

[0006] Light detection: the detector chip converts the received optical signal back to electrical signal. This process is realized through photoelectric effect, that is, under light, the electrons in the material absorb the energy of photons, and if the absorbed energy exceeds the escape work of the material, the electrons will escape the material to form photoelectrons, and a positively charged hole will be generated. Photodiode is usually used in detector chip to complete this conversion process

[0007] Optical chip is the core component of optoelectronic device, mainly applied in optical communication system, and also widely used in industry, consumer electronics, automobile, military and other fields.

[0008] And the output of general chip is polarization maintaining light, only one direction of polarization state, some applications need to contain two polarization direction light as light source. For 1550nm waveband SLD chip, it cannot directly output light containing two polarization states, so it is necessary to use single polarization chip to make non-polarization device on packaging, so as to output low polarization light source. INVENTION CONTENTS

[0009] The patent proposes a modulation device for outputting low polarization light source with arbitrary proportion of polarization state using polarization maintaining chip, aiming to expand the application range of polarization maintaining chip in the field of generating low polarization light source.

[0010] To achieve the above object, the utility model provides the following technical scheme:

[0011] A modulation device for generating arbitrary ratio low polarization light source by polarization maintaining chip, for expanding the application range of polarization maintaining light chip in the field of generating low polarization light source, comprising first lens, light splitting plate, first polarization beam splitter, quarter wave plate, mirror, reflecting prism, second polarization beam splitter, optical isolator, second lens and optical fiber.

[0012] As the preferred scheme of the utility model, the first lens is placed at the front end of the light splitting plate, wherein the first lens makes high polarization collimation into parallel light, and forms two light paths through the light splitting plate.

[0013] As the preferred scheme of the utility model, the first polarization beam splitter, the quarter wave plate and the mirror are located at the back side of the light splitting plate, wherein the light reaching the first polarization beam splitter becomes circularly polarized light after the quarter wave plate, and is reflected by the mirror and then passes through the same quarter wave plate again.

[0014] As the preferred scheme of the utility model, the reflecting prism is located at one side of the light splitting plate, the second polarization beam splitter is located at one side of the first polarization beam splitter, and the second polarization beam splitter is also located at the back side of the reflecting prism, wherein one light path is reflected by the surface of the light splitting plate and the reflecting prism to reach the second polarization beam splitter, and the other light path reaches the second polarization beam splitter after being reflected by the first polarization beam splitter.

[0015] As the preferred scheme of the utility model, the optical isolator is located at the back side of the second polarization beam splitter, and the second lens is located at the back side of the optical isolator, wherein the two light paths are combined by the second polarization beam splitter, pass through the optical isolator, and then are focused by the second lens, and finally the low polarization light is input into the optical fiber.

[0016] As the preferred scheme of the utility model, the quarter wave plate is designed as a rotatable plate.

[0017] Compared with the prior art, the utility model has the beneficial effects that: the existing chip outputs all polarization maintaining light, and only has one direction of polarization state, and some applications need to contain light with two polarization directions as light source. For the problem that the SLD chip of 1550nm waveband cannot directly output light containing two polarization states, the utility model splits the high polarization light source by the light splitting plate, the light path changes the polarization state after passing through the same quarter wave plate twice, is combined with the original polarization state light, and finally generates low polarization light; the utility model can generate different proportion S light by rotating the angle of the quarter wave plate, so as to realize the modulation of the polarization state of light. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1The overall principle schematic view of the utility model.

[0019] In the figure: 1, first lens; 2, light splitting plate; 3, first polarization beam splitter; 4, quarter wave plate; 5, reflecting mirror; 6, reflecting prism; 7, second polarization beam splitter; 8, optical isolator; 9, second lens; 10, optical fiber. DETAILED DESCRIPTION

[0020] The technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the utility model.

[0021] In order to facilitate understanding of the utility model, the utility model will be more fully described below with reference to the relevant drawings. Several embodiments of the utility model are given. However, the utility model can be realized 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 utility model more thorough and comprehensive.

[0022] It should be noted that when an element is referred to as being "fixedly attached" to another element, it can be directly on the other element or there can be intervening elements. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements can be present. The terms "vertical", "horizontal", "left", "right", and the like as used herein are for purposes of illustration and description only.

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the utility model belongs. The terminology used in the description of the utility model herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0024] Please refer to Figure 1 The utility model provides a technical scheme:

[0025] A kind of modulation device for generating arbitrary proportion low polarized light source using polarization maintaining chip, for expanding the application range of polarization maintaining light chip in the field of generating low polarized light source, including first lens 1, light splitting plate 2, first polarization beam splitter 3, quarter wave plate 4, reflecting mirror 5, reflecting prism 6, second polarization beam splitter 7, optical isolator 8, second lens 9 and optical fiber 10.

[0026] Embodiment, please refer to Figure 1 The first lens 1 is placed in front of the light splitting plate 2, wherein the first lens 1 makes the high polarization collimated into parallel light, and forms two light paths through the light splitting plate 2.

[0027] Embodiment, please refer to Figure 1 The first polarization beam splitter 3, the quarter-wave plate 4 and the reflecting mirror 5 are placed on the back side of the light splitting plate 2, wherein the light reaching the first polarization beam splitter 3 becomes circularly polarized light after transmitting through the quarter-wave plate 4, and is reflected by the reflecting mirror 5 and then transmits through the same quarter-wave plate 4 again.

[0028] Embodiment, please refer to Figure 1 The reflecting prism 6 is placed on one side of the light splitting plate 2, the second polarization beam splitter 7 is placed on one side of the first polarization beam splitter 3 and on the back side of the reflecting prism 6, and one light path is reflected by the reflecting prism 6 after being reflected by the surface of the light splitting plate 2 and reaches the second polarization beam splitter 7, and the other light path reaches the second polarization beam splitter 7 after being reflected by the first polarization beam splitter 3.

[0029] Embodiment, please refer to Figure 1 The optical isolator 8 is placed on the back side of the second polarization beam splitter 7, and the second lens 9 is placed on the back side of the optical isolator 8, wherein the two light paths are combined by the second polarization beam splitter 7, then pass through the optical isolator 8, and then are focused by the second lens 9, and finally input low polarization into the optical fiber 10.

[0030] Embodiment, please refer to Figure 1 The quarter-wave plate 4 is designed to be rotatable, and different proportions of S light are generated by rotating the angle of the quarter-wave plate 4, so as to modulate the polarization state of the light.

[0031] The working process of the utility model is as follows: the optical chip emits high polarization (P light), which is collimated into parallel light by the first lens 1, and forms two light paths through the light splitting plate 2, one of which transmits through the light splitting plate 2 and reaches the first polarization beam splitter 3, and the other of which is reflected by the surface of the light splitting plate 2 and the reflecting prism 6 and reaches the second polarization beam splitter 7, the light reaching the first polarization beam splitter 3 becomes circularly polarized light after transmitting through the quarter-wave plate 4, is reflected by the reflecting mirror 5 and then transmits through the same quarter-wave plate 4 again, at this time, the P light becomes S light, and reaches the second polarization beam splitter 7 after being reflected by the first polarization beam splitter 3, the two light paths are combined by the second polarization beam splitter 7, then pass through the optical isolator 8, and then are focused by the second lens 9, and finally input low polarization (P light+S light) into the optical fiber 10.

[0032] Although the embodiments of the present application have been shown and described, it is to be understood that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A modulation device for generating a low-polarization light source of any proportion using a polarization-maintaining chip, used to expand the application range of polarization-maintaining chips in the field of generating low-polarization light sources, characterized by: Respectively including first lens (1), light splitting plate (2), first polarization beam splitter (3), quarter wave plate (4), mirror (5), reflecting prism (6), second polarization beam splitter (7), optical isolator (8), second lens (9) and optical fiber (10), the first lens (1) is placed in the front end of light splitting plate (2), wherein the first lens (1) makes high polarization collimation into parallel light, and two-way light is formed through light splitting plate (2); The quarter wave plate (4) is a rotatable glass design, the first polarization beam splitter (3), quarter wave plate (4) and mirror (5) are located on the back side of light splitting plate (2), wherein the light reaching the first polarization beam splitter (3) is circularly polarized light after passing through the quarter wave plate (4), and is reflected by the mirror (5) and then passes through the same quarter wave plate (4) again; The reflecting prism (6) is located on one side of the light splitting plate (2), the second polarization beam splitter (7) is located on one side of the first polarization beam splitter (3), and the second polarization beam splitter (7) is located on the back side of the reflecting prism (6), and one-way light is reflected by the surface of the light splitting plate (2) and the reflecting prism (6) to reach the second polarization beam splitter (7), and the other way is reflected by the first polarization beam splitter (3) to reach the second polarization beam splitter (7); The optical isolator (8) is located on the back side of the second polarization beam splitter (7), the second lens (9) is located on the back side of the optical isolator (8), two-way light is combined by the second polarization beam splitter (7), passes through the optical isolator (8), and then passes through the second lens (9) to focus, and finally low polarization light is input into the optical fiber (10).

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