Single-ended fiber-optic polarization beam combiner

Abstract

The application discloses a single-end optical fiber polarization beam combiner, which sequentially comprises a polarization maintaining three-fiber head, a collimating lens, a prism and a mirror, three optical fibers on the polarization maintaining three-fiber head are port a, port b and port c from top to bottom, the optical fibers of port a and port c are polarization maintaining optical fibers, and the optical fiber of port b is a common single-mode optical fiber; the polarization directions of polarization light signals transmitted in port a and port c are perpendicular to each other; two beams of polarization light enter from port a and port c respectively, and are finally output after light combination from port b. The application has the characteristics of simple structure, small size and the like.

Description

Technical Field

[0001] This invention relates to the field of optical fiber communication, and more particularly to a single-ended optical fiber polarization combiner. Background Technology

[0002] Existing polarization beam combiners typically have fibers exiting from both ends, resulting in relatively long fiber lengths. Furthermore, existing polarization beam combiners are rarely combined with WDM films to form hybrid devices; using polarization beam combiners alone, along with single-ended fiber polarization beam combiners, is costly. Summary of the Invention

[0003] The purpose of this invention is to provide a single-ended fiber polarization combiner with a simple structure and small size.

[0004] A single-ended fiber polarization combiner, comprising, in sequence, a polarization-maintaining three-fiber connector, a collimating lens, a prism, and a reflector.

[0005] The three optical fibers on the polarization-maintaining three-fiber head are port a, port b and port c from top to bottom. The optical fibers at ports a and c are polarization-maintaining fibers, and the optical fiber at port b is a common single-mode fiber.

[0006] The polarization directions of the polarized light signals transmitted inside ports a and c are perpendicular to each other;

[0007] Two polarized beams enter from ports a and c respectively, and are finally combined at port b before being output.

[0008] The prism is a Wollaston prism or a Lochte prism.

[0009] A single-ended fiber polarization combiner, comprising, in sequence, a polarization-maintaining three-fiber head, a collimating lens, a first prism, a step-index diaphragm or a WDM diaphragm, a second prism, and a single-fiber collimator.

[0010] The three optical fibers on the polarization-maintaining three-fiber head are port a, port b and port c from top to bottom. The optical fibers at ports a and c are polarization-maintaining fibers, and the optical fiber at port b is a common single-mode fiber.

[0011] The fiber of the single-fiber collimator is port d and is a common single-mode fiber;

[0012] The polarization directions of the polarized light signals transmitted inside ports a and c are perpendicular to each other;

[0013] The optical signal within the reflective zone of the step-index diaphragm or WDM diaphragm enters from ports a and c respectively, and is combined and output at port b.

[0014] The optical signal within the transmission band of the step-index diaphragm or WDM diaphragm enters from ports a and c respectively, and is combined and output at port d.

[0015] The first and second prisms are either Wollaston prisms or Lochte prisms.

[0016] A single-ended fiber polarization combiner, comprising, in sequence, a polarization-maintaining three-fiber head, a collimating lens, a prism, a step-index diaphragm or a WDM diaphragm, and a single-fiber collimator.

[0017] The three optical fibers on the polarization-maintaining three-fiber head are port a, port b and port c from top to bottom. The optical fibers at ports a and c are polarization-maintaining fibers, and the optical fiber at port b is a common single-mode fiber.

[0018] The polarization directions of the polarized light signals transmitted inside ports a and c are perpendicular to each other;

[0019] The fiber of the single-fiber collimator is port d and is a polarization-maintaining fiber;

[0020] The optical signal within the reflective zone of the step-index diaphragm or WDM diaphragm enters from ports a and c respectively, and is combined and output at port b.

[0021] The optical signal within the transmission band of the step-index diaphragm or WDM diaphragm enters at port a and exits at port d, or enters at port d and exits at port e.

[0022] The prism is a Wollaston prism or a Lochte prism.

[0023] A single-ended fiber polarization combiner, comprising, in sequence, a polarization-maintaining three-fiber head, a collimating lens, a prism, a step-index diaphragm or a WDM diaphragm, and a dual-fiber collimator.

[0024] The three optical fibers on the polarization-maintaining three-fiber head are port a, port b and port c from top to bottom. The optical fibers of port a and port c are polarization-maintaining fibers, the optical fiber of port b is a common single-mode fiber, and the polarization directions of the polarized light signals transmitted inside ports a and c are perpendicular to each other.

[0025] Both fibers of the dual-fiber collimator are polarization-maintaining fibers, and from bottom to top are port d and port e, respectively. The polarization directions of the polarized light signals transmitted inside port d and port e are perpendicular to each other.

[0026] The optical signal within the reflection zone of the step-index diaphragm or WDM diaphragm enters at port a and exits at port d, or enters at port d and exits at port e;

[0027] The optical signal within the transmission band of the step-index diaphragm or WDM diaphragm enters at port a and exits at port d; enters at port c and exits at port e; or enters at port d and exits at port a, enters at port e and exits at port c.

[0028] The prism is a Wollaston prism or a Lochte prism.

[0029] The present invention employs the above technology and has the following beneficial effects:

[0030] 1. The single-ended fiber polarization combiner of this invention has a short product length and small size.

[0031] 2. The single-ended polarization combiner of the present invention can be combined with WDM films and other devices to form a hybrid device, which is inexpensive. Attached Figure Description

[0032] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments;

[0033] Figure 1 This is a schematic diagram of Embodiment 1 of the present invention;

[0034] Figure 2 This is a schematic diagram of Embodiment 2 of the present invention;

[0035] Figure 3 This is a schematic diagram of Embodiment 3 of the present invention;

[0036] Figure 4 This is a schematic diagram of Embodiment 4 of the present invention. Detailed Implementation

[0037] Example 1

[0038] like Figure 1 As shown, the present invention provides a single-ended fiber polarization combiner, which sequentially includes a polarization-maintaining three-fiber connector 1, a collimating lens 2, a prism 3, and a reflector 4.

[0039] The three optical fibers on the polarization-maintaining three-fiber head 1 are port a, port b and port c from top to bottom. The optical fibers at ports a and c are polarization-maintaining fibers, and the optical fiber at port b is a common single-mode fiber.

[0040] The polarization directions of the polarized light signals transmitted inside ports a and c are perpendicular to each other;

[0041] Figure 1 It is a single-ended fiber polarization combiner, meaning that two polarized lights enter from port a and port c respectively, and are combined at port b before being output.

[0042] Transmission from port a to port b: The polarized light signal enters the polarization-maintaining fiber from the upper left end (port a) through the three fiber optic connector described in this patent into the polarization beam combiner. Then, after collimating lens 2, the polarized light signal enters prism 3 (Wollaston prism 3 or Loch Hung prism 3) after being collimated by collimating lens 2. After being reflected by mirror 4, the polarized light signal enters prism 3 (Wollaston prism 3 or Loch Hung prism 3) again. After passing through prism 3, the light signal enters collimating lens 2, and the beam is converged and output from the middle port b (the fiber of port b is a common single-mode fiber).

[0043] Transmission from port c to port b: The polarized light signal enters the polarization-maintaining fiber from the upper left end (port c) through the three fiber optic connectors into the polarization beam combiner described in this patent. Then, after collimating lens 2, the polarized light signal enters prism 3 (Wollaston prism 3 or Lochten prism 3) after being collimated by collimating lens 2. After being reflected by mirror 4, the polarized light signal enters prism 3 (Wollaston prism 3 or Lochten prism 3) again. After passing through prism 3, the light signal enters collimating lens 2, and the beam is converged and output from the middle port b (the fiber of port b is ordinary single-mode fiber).

[0044] It should be noted that the single-ended polarization beam combiner described in this patent has both polarization combining and polarization splitting functions. That is, when an optical signal is input from port b, after passing through the single-ended polarization beam combiner described in this patent, the polarized optical signal will be output from port a and port c respectively, thus achieving the function of polarization splitting.

[0045] Example 2

[0046] like Figure 2 As shown, the present invention includes, in sequence, a polarization-maintaining three-fiber head 1, a collimating lens 2, a first prism 3, a step diaphragm or WDM diaphragm 4, a second prism 5, and a single-fiber collimator 6.

[0047] The three optical fibers on the polarization-maintaining three-fiber head 1 are port a, port b and port c from top to bottom. The optical fibers at ports a and c are polarization-maintaining fibers, and the optical fiber at port b is a common single-mode fiber.

[0048] The fiber of the single-fiber collimator 6 is port d and is a common single-mode fiber;

[0049] The polarization directions of the polarized light signals transmitted inside ports a and c are perpendicular to each other;

[0050] Example 2 is a hybrid device integrating a single-ended polarization combiner and a WDM diaphragm.

[0051] Example 2 replaces the reflector with a step-index diaphragm or WDM diaphragm 4, and adds a second prism 5 (Wollaston prism or Lochon prism) and a single-fiber collimator 6 on the right side.

[0052] Figure 2 The left half of the structural diagram (the part to the left of the step membrane or WDM membrane 4) is... Figure 1 The single-ended polarization beam combiner described above functions as follows: Figure 1The single-end polarization combining and splitting functions described herein are only for optical signals whose wavelengths are within the reflection band of the step-index film or WDM film 4. Optical signals within the transmission band of the step-index film or WDM film 4 can be directly transmitted from port a to port d or from port c to port d.

[0053] Therefore, the functions of Example 2 can be summarized as follows:

[0054] For optical signals within the 4th reflection zone of a step-index diaphragm or WDM diaphragm, light enters from ports a and c, and is combined and output from port b, which can be used for reverse beam splitting.

[0055] For optical signals within the transmission band of a step-index diaphragm or WDM diaphragm, light enters from ports a and c, and is combined and output at port d, allowing for reverse beam splitting applications.

[0056] Example 3

[0057] like Figure 3 As shown, the present invention provides a single-ended fiber polarization combiner, which includes, in sequence, a polarization-maintaining three-fiber head 1, a collimating lens 2, a prism 3, a step-index diaphragm or a WDM diaphragm 4, and a single-fiber collimator 5.

[0058] The three optical fibers on the polarization-maintaining three-fiber head 1 are port a, port b and port c from top to bottom. The optical fibers at ports a and c are polarization-maintaining fibers, and the optical fiber at port b is a common single-mode fiber.

[0059] The polarization directions of the polarized light signals transmitted inside ports a and c are perpendicular to each other;

[0060] The fiber of the single-fiber collimator 5 is port d and is a polarization-maintaining fiber.

[0061] Example 3 is a hybrid device integrating a single-ended polarization combiner and a WDM diaphragm.

[0062] Example 3 replaces the reflector with a step-index diaphragm or WDM diaphragm 4 based on Example 1, and then adds a single-fiber collimator 5 on the right side.

[0063] Figure 3 The left half of the structural diagram (the part to the left of the step membrane or WDM membrane 4) is... Figure 1 The single-ended polarization beam combiner described above functions as follows: Figure 1 The single-end polarization combining and splitting functions described herein are only applicable to optical signals whose wavelengths are within the reflection band of the step-index film or WDM film 4. Optical signals within the transmission band of the step-index film or WDM film 4 can be directly transmitted from port a to port d.

[0064] Therefore, the functions of Example 3 can be summarized as follows:

[0065] For optical signals within the 4th reflection zone of a step-index diaphragm or WDM diaphragm, light enters from ports a and c, and is combined and output from port b, which can be used for reverse beam splitting.

[0066] For optical signals within the transmission band of a step-index diaphragm or WDM diaphragm 4, light enters from port a and outputs from port d, which can be applied in reverse.

[0067] Example 4

[0068] like Figure 4 As shown, the present invention provides a single-ended fiber polarization combiner, which sequentially includes a polarization-maintaining three-fiber head 1, a collimating lens 2, a prism 3, a step-index diaphragm or a WDM diaphragm 4, and a dual-fiber collimator 5.

[0069] The three optical fibers on the polarization-maintaining three-fiber head 1 are port a, port b and port c from top to bottom. The optical fibers of port a and port c are polarization-maintaining fibers, the optical fiber of port b is a common single-mode fiber, and the polarization directions of the polarized light signals transmitted inside port a and port c are perpendicular to each other.

[0070] Both optical fibers of the dual-fiber collimator 5 are polarization-maintaining fibers, and from bottom to top are port d and port e, respectively. The polarization directions of the polarized light signals transmitted inside port d and port e are perpendicular to each other.

[0071] Example 4 is a hybrid device integrating a single-ended polarization combiner and a WDM diaphragm.

[0072] Example 4 replaces the reflector with a step-index diaphragm or WDM diaphragm 4 based on Example 1, and then adds a dual-fiber collimator 5 on the right side.

[0073] Figure 4 The left half of the structural diagram (the part to the left of the step membrane or WDM membrane 4) is... Figure 1 The single-ended polarization beam combiner described above functions as follows: Figure 1 The single-end polarization combining and splitting functions described herein are only applicable to optical signals whose wavelengths are within the reflection band of the step-index film or WDM film 4. Optical signals within the transmission band of the step-index film or WDM film 4 can be directly transmitted from port a to port d, and from port c to port e.

[0074] Therefore, the functions of Example 4 can be summarized as follows:

[0075] For optical signals within the 4th reflection zone of a step-index diaphragm or WDM diaphragm, light enters from ports a and c, and is combined and output from port b, which can be used for reverse beam splitting.

[0076] For optical signals within the transmission band of a step-index diaphragm or WDM diaphragm, light enters from port a and exits from port d; light enters from port c and exits from port e. This can be applied in reverse.

[0077] The implementation of the present invention has been described above with reference to the accompanying drawings. However, the present invention is not limited to the specific embodiments described above. The specific embodiments described above are illustrative and not intended to limit the present invention. Those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be covered within the scope of the claims and specification of the present invention.

Claims

1. A single-ended optical fiber polarization combiner, characterized by: It sequentially comprises a polarization maintaining three-fiber head, a collimating lens, a prism and a mirror, The three fibers on the polarization maintaining three-fiber head are port a, port b and port c from top to bottom, the fibers of port a and port c are polarization maintaining fibers, and the fiber of port b is a common single-mode fiber; The polarization directions of the polarization light signals transmitted in port a and port c are perpendicular to each other; Two beams of polarization light enter from port a and port c respectively, and are finally combined and output from port b; The prism is a Wollaston prism or a Rochon prism; Transmission from port a to port b: the polarization light signal from the polarization maintaining fiber of port a enters the collimating lens through the polarization maintaining three-fiber head, the polarization light signal enters the prism after the beam is collimated by the collimating lens, then the polarization light signal enters the prism again after being reflected by the mirror, the light signal enters the collimating lens after passing through the prism, and the beam is converged and output from the middle port b; Transmission from port c to port b: the polarization light signal from the polarization maintaining fiber of port c enters the collimating lens through the polarization maintaining three-fiber head, the polarization light signal enters the prism after the beam is collimated by the collimating lens, then the polarization light signal enters the prism again after being reflected by the mirror, the light signal enters the collimating lens after passing through the prism, and the beam is converged and output from the middle port b.

2. A single-ended optical fiber polarization combiner, characterized by: It sequentially comprises a polarization maintaining three-fiber head, a collimating lens, a first prism, a step film or a WDM film, a second prism and a single-fiber collimator; The three fibers on the polarization maintaining three-fiber head are port a, port b and port c from top to bottom, the fibers of port a and port c are polarization maintaining fibers, and the fiber of port b is a common single-mode fiber; The fiber of the single-fiber collimator is port d, and is a common single-mode fiber; The polarization directions of the polarization light signals transmitted in port a and port c are perpendicular to each other; The step film or the WDM film reflects the in-band light signal, and the light enters from port a and port c respectively and is output from port b after being combined; The step film or the WDM film transmits the in-band light signal, and the light enters from port a and port c respectively and is output from port d after being combined; The first prism and the second prism are Wollaston prisms or Rochon prisms; Transmission from port a to port b: the polarization light signal from the polarization maintaining fiber of port a enters the collimating lens through the polarization maintaining three-fiber head, the polarization light signal enters the first prism after the beam is collimated by the collimating lens, then the polarization light signal enters the first prism again after being reflected by the step film or the WDM film, the light signal enters the collimating lens after passing through the first prism, and the beam is converged and output from the middle port b; Transmission from port c to port b: the polarization light signal from the polarization maintaining fiber of port c enters the collimating lens through the polarization maintaining three-fiber head, the polarization light signal enters the first prism after the beam is collimated by the collimating lens, then the polarization light signal enters the first prism again after being reflected by the step film or the WDM film, the light signal enters the collimating lens after passing through the first prism, and the beam is converged and output from the middle port b.

3. A single-ended optical fiber polarization combiner, characterized by: It sequentially comprises a polarization maintaining three-fiber head, a collimating lens, a prism, a step film or a WDM film, a single-fiber collimator; The three optical fibers on the polarization maintaining three optical fiber head are port a, port b and port c from top to bottom, the optical fibers of port a and port c are polarization maintaining optical fibers, and the optical fiber of port b is a common single-mode optical fiber; The polarization directions of the polarization light signals transmitted in port a and port c are perpendicular to each other; The optical fiber of the single optical fiber collimator is port d, and is a polarization maintaining optical fiber; The step film or WDM film reflects the in-band optical signals, and the optical signals enter from port a and port c respectively and are output from port b; The step film or WDM film transmits the in-band optical signals, and the optical signals enter from port a and are output from port d; The prism is a Wollaston prism or a Rochon prism; Port a to port b transmission: the polarization light signal from the polarization maintaining optical fiber of port a enters the collimating lens through the polarization maintaining three optical fiber head, the polarization light signal enters the prism after the light beam is collimated by the collimating lens, then the polarization light signal enters the prism again after being reflected by the step film or WDM film, and the optical signal enters the collimating lens after passing through the prism, and the light beam is converged and output from the middle port b; Port c to port b transmission: the polarization light signal from the polarization maintaining optical fiber of port c enters the collimating lens through the polarization maintaining three optical fiber head, the polarization light signal enters the prism after the light beam is collimated by the collimating lens, then the polarization light signal enters the prism again after being reflected by the step film or WDM film, and the optical signal enters the collimating lens after passing through the prism, and the light beam is converged and output from the middle port b.

4. A single-ended optical fiber polarization combiner, characterized by: It sequentially comprises a polarization maintaining three optical fiber head, a collimating lens, a prism, a step film or WDM film, and a double optical fiber collimator; The three optical fibers on the polarization maintaining three optical fiber head are port a, port b and port c from top to bottom, the optical fibers of port a and port c are polarization maintaining optical fibers, and the optical fiber of port b is a common single-mode optical fiber, and the polarization directions of the polarization light signals transmitted in port a and port c are perpendicular to each other; The two optical fibers of the double optical fiber collimator are polarization maintaining optical fibers, and are port d and port e from bottom to top, and the polarization directions of the polarization light signals transmitted in port d and port e are perpendicular to each other; The step film or WDM film reflects the in-band optical signals, and the optical signals enter from port a and port c respectively and are output from port b; The step film or WDM film transmits the in-band optical signals, and the optical signals enter from port a and are output from port d, and enter from port c and are output from port e; The prism is a Wollaston prism or a Rochon prism; Port a to port b transmission: the polarization light signal from the polarization maintaining optical fiber of port a enters the collimating lens through the polarization maintaining three optical fiber head, the polarization light signal enters the prism after the light beam is collimated by the collimating lens, then the polarization light signal enters the prism again after being reflected by the step film or WDM film, and the optical signal enters the collimating lens after passing through the prism, and the light beam is converged and output from the middle port b; Port c to port b transmission: the polarization light signal from the polarization maintaining optical fiber of port c enters the collimating lens through the polarization maintaining three optical fiber head, the polarization light signal enters the prism after the light beam is collimated by the collimating lens, then the polarization light signal enters the prism again after being reflected by the step film or WDM film, and the optical signal enters the collimating lens after passing through the prism, and the light beam is converged and output from the middle port b.

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