TWI471614B - Optical signal transmission direction adjustable optical circulator - Google Patents

Description

Optical circulator with adjustable optical transmission direction

The invention relates to an optical circulator, in particular to an optical circulator with adjustable transmission direction and multi-turn transmission, and a low-cost optical signal transmission direction adjustable with avoiding the problem of polarization mode dispersion.

Among optical communication network systems, optical communication components occupy an indispensable position. Various optical communication components include optical fiber connectors, optical couplers, optical isolators, optical attenuators, optical circulators, etc., and their applications include : Optical add/drop multiplexer/demultiplexer (OADM), optical amplifier, optical switch, and optical sensing.

Among all optical communication components, optical circulators are one of the most commonly used components, and they are very important optical passive devices in optical communication network systems. The main characteristic of the optical circulator is that the transmission direction of the signal light is irreversible, and the signal light is transmitted between the transmission 依 according to the orderly transmission path and the fixed direction, and plays a role in the system selection and connection in the system application. The important role.

The components of the general optical circulator mainly include a spatial walk-off polarizer (SWP), a Faraday rotator (FR), a half wave-plate (H), and a partial bias. Polar spectroscopes and various reflections. And according to SWP The manufacturing method and operation principle, the optical circulator can be divided into three types: traditional, waveguide and holographic. The traditional optical circulator mainly uses the birefringent crystal SWP, combined with other components to achieve its function; although the traditional manufacturing technology is quite mature, it is limited by the quality and efficiency of the birefringent crystal, so the cost is high, plus The number of components is large and the design is complicated, and there are disadvantages that it is difficult to assemble and intensify. The waveguide optical circulator replaces the function of the crystal SWP by the irreversible phase shift of the Mach-Zehnder interferometer; the component manufacturing is easy to combine with the semiconductor process, so it is easy to integrate and couple the light, but its manufacturing and production The equipment is expensive and limited by good magneto-optical materials, so the length of the components is not easily reduced. The holographic optical circulator is a new component newly proposed in recent years. Its composition and operation principle are similar to those of the traditional optical circulator. The biggest feature is the use of the holographic SWP of the holographic-selective component to replace the crystal SWP. The introduction of components is therefore advantageous in that it is easy to densify, the number of transport defects can be easily expanded, and the cost is relatively low. However, since this circulator is limited to holographic recording materials, it has not been popularized.

With the increasing complexity of the design and function of optical communication network systems today, the application value of optical circulators in optical communication network systems is bound to improve the transmission speed and transmission volume of signals. The optical circulators of the above-mentioned various types generally have insufficient number of turns and can only be transmitted in one direction, so that the current optical circulators can no longer meet the requirements of modern optical communication network systems. If the optical circulator can design a transmission function that can be switched between transmission ports and has a transmission function of multiple transmission ports, this can not only break the old optical circulator but only as a fixed and one-way transmission, and also Can make up for the old optical Rings generally have the problem of insufficient transmission, which makes the use of optical communication network systems more flexible, and such a design is bound to drive the development of optical communication network systems.

Therefore, based on years of research and development and many practical experiences, the inventors have proposed an optical circulator with adjustable optical signal transmission direction, thereby improving the performance and practicality of the old optical circulator, and designing the optical circulator. Can meet the needs of today's optical communication network systems.

In view of the above problems of the prior art, it is an object of the present invention to provide an optical circulator which is adjustable in transmission and multi-turn in transmission, and which is relatively flexible and highly strainable in use.

Another object of the present invention is to provide a four-inch optical circulator as a module, which can be stacked in the longitudinal direction, and utilizes the wave 稜鏡 to guide the signal transmission between the modules, so that An optical circulator that can easily be expanded by the number of transmitted turns.

It is still another object of the present invention to provide an optical circulator that is simple in construction, symmetrical, dense, low cost, and that is extremely independent and unbiased.

According to the above object of the present invention, an optical circulator with an adjustable optical signal transmission direction is provided in at least one transmission space, and the optical circulator with adjustable optical signal transmission direction includes a first spatial deviation polarization module. a polarization rotating component and a second spatial deviation from the polarization module, and the polarization rotation component is disposed between the first spatial deviation polarization module and the second spatial deviation polarization module. The at least one transmission space has a plurality of transmission ports, such that one of the transmission channels outputs an input beam to the first spatial deviation from the polarization module, Outputting an output beam from the second spatially offset biasing module to another transmission port, or transmitting one of the output beams to the second spatially offset polarizing module via the polarization rotating element And outputting an output beam from the first space away from the polarization module to another transmission port. The polarization state of the input beam is modulated by the polarization rotation element to change the output direction of the output beam, so that the input beam and the output beam are tunably transmitted in the transmission space.

Wherein, when the foregoing transmission space is the first transmission space of the bottom layer, the number of the plurality of transmission ports is four, and sequentially is P ₁ , P ₂ , P ₃ and P ₄ , and the optical signal transmission direction is adjustable. The optical circulator is disposed between the four transmission ports, and the transmission paths of the input beam and the output beam in the first transmission space by the polarization rotation element are P ₁ to P ₂ , P ₂ to P ₃ , P ₃ To P ₄ and P ₄ to P ₁ , or P ₁ to P ₄ , P ₄ to P ₃ , P ₃ to P ₂ and P ₂ to P ₁ .

Wherein, when the foregoing transmission space further longitudinally stacks a total of N transmission spaces, and the number of the plurality of transmission ports is (4+2N), and the optical circulators whose optical signal transmission direction is adjustable are equally stacked in the longitudinal direction. Therefore, each transmission space has a set of optical circulators with adjustable optical signal transmission directions, and the optical circulator with adjustable optical signal transmission direction further includes at least one wave 稜鏡, which are respectively disposed on two stacked on each other. a space deviating from the polarizing module or two second spaces stacked on each other offset from one side of the polarizing module, the corona receiving an output beam of one of the transmission spaces, and reflecting the output beam to another transmission The space is transmitted such that the transmission paths are P ₁ to P ₂ , P ₂ to P ₃ , P ₃ to P ₄ ..., P _(4+2N)-1 to P _(442N) , and P _(4+2N) to P ₁ or P ₁ to P _(4+2N) , and P _(4+2N) to P _(4+2N)-1 ... P ₄ to P ₃ , P ₃ to P ₂ and P ₂ to P ₁ .

Preferably, the first spatially offset polarizing module receives an input beam of one of the transmission chirp outputs, and divides the input beam into a first polarized beam and a second polarized beam, and the first polarized beam is The input beam is vertically polarized, and the second polarized beam is the horizontal polarization of the input beam. The polarization rotation element is adjacent to the first spatially offset polarizer module, and the polarization rotation element receives the first polarization beam and the second polarization beam, and modulates the polarization states of the first polarization beam and the second polarization beam to output The third polarized beam and the fourth polarized beam. The second spatially offset polarizing module is disposed corresponding to the first spatially offset polarizing module, and the second spatially offset polarizing module receives the third polarized light beam and the fourth polarized light beam to enable the fourth polarized light and the third polarized light. The polarized beams are combined into an output beam and output, and the output direction of the output beam changes according to the polarization states of the third polarized beam and the fourth polarized beam.

Preferably, the first spatially offset polarizing module comprises a first polarizing beam splitter and a first reflecting beam. The first polarizing beam splitter receives the input beam and splits the input beam into a first polarized beam and a second polarized beam. The first reflection 稜鏡 is disposed on one side of the first polarization beam splitter, and the first reflection 稜鏡 receives and reflects the first polarization beam or the second polarization beam, so that the traveling paths of the first polarization beam and the second polarization beam are mutually parallel. The second spatially offset polarizing module and the first spatially offset polarizing module are disposed on opposite sides of the polarization rotating component, and the second spatially offset polarizing module comprises a second polarizing beam splitter and a first Two reflections. The second polarizing beam splitter receives the third polarized beam. The second reflective 稜鏡 receives and reflects the fourth polarized beam such that the fourth polarized beam is incident on the second polarizing beam splitter and combined with the third polarized beam into an output beam, and from the second polarizing beam splitter toward the other transmission port Output.

Preferably, a Faraday rotator is added between the first spatially offset polarizing module and the second spatially offset polarizing module, and the Faraday rotator and the polarization rotating component are defined to form a polarization modulation module. The polarization rotation element rotates by a second predetermined angle to modulate the polarization state of the first polarization beam and the polarization state of the second polarization beam, and output the third polarization beam and the fourth polarization beam. Wherein, the second preset angle may make the total rotation angle of the polarization state be 0 degrees or 90 degrees respectively.

Preferably, the aforementioned polarization rotator element is an element that can rotate the polarization state, and it may comprise a half wave plate or a twisted nematic liquid crystal cell.

According to the above invention, the optical circulator with adjustable optical signal transmission direction can provide an adjustable transmission direction, which is more flexible and highly strainable in use; and is designed with four opticals. The circulator is a module and can be stacked in the longitudinal direction, while using the wave 稜鏡 to guide the signal transmission between the modules, so that the number of transmission rafts can be easily expanded. Thereby, it has the advantages of simple structure, symmetry, intensiveness, low cost, partial polarization and unbiased polar mode dispersion.

1‧‧‧First space deviation from the pole module

11‧‧‧First polarized beam splitter

12‧‧‧First reflection

2‧‧‧Second space deviation depolarization module

21‧‧‧Second polarized beam splitter

22‧‧‧Second Reflector

3‧‧‧Polarization Modulation Module

31‧‧‧Faraday rotator

32‧‧‧Polarization rotating element

4‧‧‧Polo

100‧‧‧First transmission space

200‧‧‧Second transmission space

A, A'‧‧‧ input beam

B, B’‧‧‧ output beam

L1, L1'‧‧‧ first polarized beam

L2, L2'‧‧‧ second polarized beam

L3, L3'‧‧‧ third polarized beam

L4, L4'‧‧‧ fourth polarized beam

P ₁ ‧‧‧First transmission埠

P ₂ ‧‧‧Second transmission埠

P ₃ ‧‧‧Third transmission埠

P ₄ ‧‧‧four transmission埠

P ₅ ‧‧‧Fix transmission

P ₆ ‧‧‧ sixth transmission

P _(4+2N)-1 ‧‧‧(4+2N)-1 transmission

P _(4+2N) ‧‧‧(4+2N) transmission

1 is a schematic diagram of a P1 to P2 optical path of a first embodiment of an optical circulator with an adjustable optical signal transmission direction according to the present invention.

2 is a schematic diagram of the P2 to P3 optical path of the first embodiment of the optical circulator with adjustable optical signal transmission direction of the present invention.

Figure 3 is a schematic diagram of the P3 to P4 optical path of the first embodiment of the optical circulator with adjustable optical signal transmission direction of the present invention.

Fig. 4 is a schematic view showing the P4 to P1 optical path of the first embodiment of the optical circulator with adjustable optical signal transmission direction of the present invention.

Figure 5 is a schematic view of the P1 to P4 optical path of the first embodiment of the optical circulator with adjustable optical signal transmission direction of the present invention.

Figure 6 is a schematic view of the P4 to P3 optical path of the first embodiment of the optical circulator with adjustable optical signal transmission direction of the present invention.

Figure 7 is a schematic diagram of the P3 to P2 optical path of the first embodiment of the optical circulator with adjustable optical signal transmission direction of the present invention.

Figure 8 is a schematic diagram of the P2 to P1 optical path of the first embodiment of the optical circulator with adjustable optical signal transmission direction of the present invention.

Figure 9 is a schematic view of the P1 to P2 optical path of the second embodiment of the optical circulator with adjustable optical signal transmission direction of the present invention.

Figure 10 is a schematic diagram of the P2 to P3 optical path of the second embodiment of the optical circulator with adjustable optical signal transmission direction of the present invention.

Figure 11 is a schematic view of the P3 to P4 optical path of the second embodiment of the optical circulator with adjustable optical signal transmission direction of the present invention.

Figure 12 is a schematic diagram of the P4 to P5 optical path of the second embodiment of the optical circulator with adjustable optical signal transmission direction of the present invention.

Figure 13 is a schematic view of the P5 to P6 optical path of the second embodiment of the optical circulator with adjustable optical signal transmission direction of the present invention.

Figure 14 is a schematic view of the P6 to P1 optical path of the second embodiment of the optical circulator with adjustable optical signal transmission direction of the present invention.

Figure 15 is a schematic view of the P1 to P6 optical path of the second embodiment of the optical circulator with adjustable optical signal transmission direction of the present invention.

Figure 16 is a schematic view of the P6 to P5 optical path of the second embodiment of the optical circulator with adjustable optical signal transmission direction of the present invention.

Figure 17 is a schematic view of the P5 to P4 optical path of the second embodiment of the optical circulator with adjustable optical signal transmission direction of the present invention.

Figure 18 is a schematic diagram of the P4 to P3 optical path of the second embodiment of the optical circulator with adjustable optical signal transmission direction of the present invention.

Figure 19 is a schematic diagram of the P3 to P2 optical path of the second embodiment of the optical circulator with adjustable optical signal transmission direction of the present invention.

Figure 20 is a schematic diagram of the P2 to P1 optical path of the second embodiment of the optical circulator with adjustable optical signal transmission direction of the present invention.

Figure 21 is a schematic view of the P1 to P2 optical path of the third embodiment of the optical circulator with adjustable optical signal transmission direction of the present invention.

Figure 22 is a schematic diagram of the P2 to P3 optical path of the third embodiment of the optical circulator with adjustable optical signal transmission direction of the present invention.

Figure 23 is a schematic diagram of the P3 to P4 optical path of the third embodiment of the optical circulator with adjustable optical signal transmission direction of the present invention.

Figure 24 is a schematic view of the P4 to P1 optical path of the third embodiment of the optical circulator with adjustable optical signal transmission direction of the present invention.

Figure 25 is a schematic view of the P1 to P4 optical path of the third embodiment of the optical circulator with adjustable optical signal transmission direction of the present invention.

Figure 26 is a schematic diagram of the P4 to P3 optical path of the third embodiment of the optical circulator with adjustable optical signal transmission direction of the present invention.

Figure 27 is a schematic diagram of the P3 to P2 optical path of the third embodiment of the optical circulator with adjustable optical signal transmission direction of the present invention.

Figure 28 is a schematic diagram of the P2 to P1 optical path of the third embodiment of the optical circulator with adjustable optical signal transmission direction of the present invention.

Figure 29 is a schematic view showing the P1 to P2 optical path of the fourth embodiment of the optical circulator with adjustable optical signal transmission direction of the present invention.

Figure 30 is a schematic diagram of the P2 to P3 optical path of the fourth embodiment of the optical circulator with adjustable optical signal transmission direction of the present invention.

Figure 31 is a schematic view showing the P3 to P4 optical path of the fourth embodiment of the optical circulator with adjustable optical signal transmission direction of the present invention.

Figure 32 is a schematic diagram of the P4 to P5 optical path of the fourth embodiment of the optical circulator with adjustable optical signal transmission direction of the present invention.

Figure 33 is a schematic view showing the P5 to P6 optical path of the fourth embodiment of the optical circulator with adjustable optical signal transmission direction of the present invention.

Figure 34 is a schematic diagram of the P6 to P1 optical path of the fourth embodiment of the optical circulator with adjustable optical signal transmission direction of the present invention.

Figure 35 is a schematic view of the P1 to P6 optical path of the fourth embodiment of the optical circulator with adjustable optical signal transmission direction of the present invention.

Figure 36 is a schematic view of the P6 to P5 optical path of the fourth embodiment of the optical circulator with adjustable optical signal transmission direction of the present invention.

Figure 37 is a schematic view showing the P5 to P4 optical path of the fourth embodiment of the optical circulator with adjustable optical signal transmission direction of the present invention.

Figure 38 is a schematic diagram of the P4 to P3 optical path of the fourth embodiment of the optical circulator with adjustable optical signal transmission direction of the present invention.

Figure 39 is a schematic diagram of the P3 to P2 optical path of the fourth embodiment of the optical circulator with adjustable optical signal transmission direction of the present invention.

Figure 40 is a schematic diagram of the P2 to P1 optical path of the fourth embodiment of the optical circulator with adjustable optical signal transmission direction of the present invention.

Figure 41 is a longitudinal stacking diagram of a fifth embodiment of the optical circulator with adjustable optical signal transmission direction of the present invention.

Figure 42 is a schematic view showing the P (4+2N) to P1 optical path of the fifth embodiment of the optical circulator with adjustable optical signal transmission direction of the present invention.

Figure 43 is a schematic diagram of the P1 to P(4+2N) optical path of the fifth embodiment of the optical circulator with adjustable optical signal transmission direction of the present invention.

Figure 44 is a longitudinal stacking diagram of a sixth embodiment of the optical circulator with adjustable optical signal transmission direction of the present invention.

Figure 45 is a schematic view showing the P (4+2N) to P1 optical path of the sixth embodiment of the optical circulator with adjustable optical signal transmission direction of the present invention.

Figure 46 is a schematic diagram of the P1 to P(4+2N) optical path of the sixth embodiment of the optical circulator with adjustable optical signal transmission direction of the present invention.

As shown in FIG. 1, the present invention provides a first embodiment of an optical circulator with adjustable optical signal transmission direction. The optical circulator is disposed in a transmission space, and the transmission space has a plurality of transmission ports, and the optical circulator is provided with a first spatial deviation polarization module, a polarization modulation module 3, and a second space. The polarization modulation module 3 is disposed between the first spatial deviation polarization module 1 and the second spatial deviation polarization module 2 . The first spatial depolarization module 1 includes a first polarization beam splitter 11 and a first reflector 12; and the second spatial depolarization module 2 includes a second polarization beam splitter 21 and a second reflector 22 And polarization modulation The module 3 includes a Faraday rotator 31 and a polarization rotator element 32. The polarization rotating element 32 is rotatable to change the orientation of the first spatial deviation from the polarization module 1 and the second spatial deviation from the polarization module 2. The change of the beam path state generated before and after the rotation of the polarization rotating element 32 of the present embodiment will be described below. The first to fourth figures show the state before the rotation of the polarization rotating element 32, and the fifth to eighth figures. The figure shows the state in which the polarization rotator 32 is rotated.

Please refer to FIG. 1 to FIG. 4 , which are schematic diagrams of the P ₁ to P ₂ optical path of the first embodiment of the optical circulator with adjustable optical signal transmission direction according to the present invention, and the optical signal transmission direction of the present invention is adjustable. The P ₂ to P ₃ optical path diagram of the first embodiment of the optical circulator, the P ₃ to P ₄ optical path diagram of the first embodiment of the optical circulator with adjustable optical signal transmission direction of the present invention, and the optical signal of the present invention A schematic diagram of the P ₄ to P ₁ optical path of the first embodiment of the optical circulator with adjustable transmission direction.

In order to make the embodiment easy to understand, the xz coordinate system is defined first, and the definition symbol ⊕ is expressed as non-polarized light, the symbol Θ is expressed as horizontally polarized light, and Expressed as vertically polarized light. Meanwhile, in the first embodiment, the polarization rotation direction of the Faraday rotator 31 is set to be positive 45 degrees with respect to the x- axis and the axial direction of the polarization rotation element 32 is positive 45 degrees with respect to the x- axis. When the input beam A propagates from the first transmission 埠P ₁ to the +z direction to the first polarization depolarizing mirror 11 of the first spatial deviation polarization module 1 , the input beam A is split by the first polarization beam splitter 11 at this time. The first polarized light beam L1 and the second polarized light beam L2 are respectively represented, and the first polarized light beam L1 and the second polarized light beam L2 respectively represent the polarization of the vertical polarization and the horizontal polarization of the input beam A (the same applies to the following embodiments).

The first polarized light beam L1 (vertical polarized light) is reflected by the first polarizing beam splitter 11 and then reflected by the first reflecting beam 12, and the second polarized light beam L2 (horizontal polarized light) maintains the traveling direction of the original input beam A, and The first polarized light beam L1 is simultaneously incident on the Faraday rotator 31 and the polarization rotating element 32 of the polarization modulation module 3. At this time, the Faraday rotator 31 and the polarization rotation element 32 respectively rotate the polarization states of the first polarization beam L1 and the second polarization beam L2 by 45 degrees with respect to the transmission direction, so that the first polarization beam L1 and the second polarization beam L2 are rotated. The polarization states are rotated by +90 degrees in total, and the first polarized light beam L1 and the second polarized light beam L2 are converted into a third polarized light beam L3 and a fourth polarized light beam L4.

For convenience of description of various embodiments, it is further defined that the third polarized light beam L3 refers to a light beam that is incident on the second polarized beam splitter 21 or the first polarized beam splitter 11 after being subjected to the polarization modulation module 3, and the fourth polarized light beam L4 is It is a light beam incident on the second reflection 稜鏡 22 or the first reflection 稜鏡 12 (the same applies to the following embodiments).

At this time, the first polarized light beam L1 will be converted into the horizontally polarized third polarized light beam L3, while the second polarized light beam L2 will be converted into the vertically polarized fourth polarized light beam L4. Then, the third polarized light beam L3 is incident on the second polarizing beam splitter 21, and the fourth polarized light beam L4 is reflected by the second reflecting beam 22 of the second spatially offset polarizing module 2 to the second polarizing beam splitter 21, Finally, it combines with the third polarized light beam L3 to form an output beam B, and outputs it to the second transmission 埠P ₂ .

In the present embodiment, the input beam A is non-polarized light, and the polarization rotator 32 comprises a half-wave plate or a twisted nematic liquid crystal cell. (all below) with).

In Fig. 2, the configuration of the optical circulator with adjustable optical transmission direction is the same as that of Fig. 1, when the input beam A is transmitted from the second transmission 埠P ₂ to the -z direction to the second spatial deviation from the polarization module 2 In the case of the second polarization beam splitter 21, the input beam A is split by the second polarization beam splitter 21 into a vertically polarized first polarized light beam L1 and a horizontally polarized second polarized light beam L2. The second polarized light beam L2 maintains the traveling direction of the original input beam A, and the first polarized light beam L1 is reflected by the second polarizing beam splitter 21 and then reflected by the second reflecting beam 22, and then the first polarized light beam L1 and the first The two polarized light beams L2 are simultaneously incident on the polarization rotating element 32 of the polarization modulation module 3 and the Faraday rotator 31. Since the Faraday rotator 31 is a non-reciprocal element, the polarization rotator 32 and the Faraday rotator 31 respectively rotate the polarization states of the two polarized beams by -45 degrees and clockwise by +45 degrees with respect to the transmission direction. The polarization states of a polarized light beam L1 and a second polarized light beam L2 are rotated by a total of 0 degrees, at which time the first polarized light beam L1 maintains a vertical polarization to become a third polarized light beam L3 while the second polarized light beam L2 maintains a horizontal polarization to become a fourth polarization. Light beam L4. Then, the fourth polarized light beam L4 is reflected by the first reflection 稜鏡12 of the first spatial depolarization module 1 to the first polarization beam splitter 11 , and finally combined with the third polarization beam L3 to form an output beam B, and output to the output beam B. The third transmission 埠 P ₃ .

In Fig. 3, when the input beam A is propagated from the third transmission 埠P ₃ to the +z direction to the first polarization splitting mirror 11 of the first spatially offset polarizing module 1, the input beam A is split by the first polarizing beam splitter. 11 is divided into a first polarized light beam L1 that is vertically polarized and a second polarized light beam L2 that is horizontally polarized. The first polarized light beam L1 is reflected by the first polarizing beam splitter 11 and the second polarized light beam L2 is reflected by the first reflecting beam 12. Then, the first polarized light beam L1 and the second polarized light beam L2 are simultaneously incident on the Faraday rotator 31 and the polarization rotating element 32 of the polarization modulation module 3. When the Faraday rotator 31 and the polarization rotator 32 respectively rotate the polarization states of the two polarization beams by +45 degrees with respect to the transmission direction, the polarization states of the first polarization beam L1 and the second polarization beam L2 are rotated in total. At 90 degrees, the first polarized light beam L1 is converted into a horizontally polarized fourth polarized light beam L4, and the second polarized light beam L2 is converted into a vertically polarized third polarized light beam L3. Then, the fourth polarized light beam L4 is reflected by the second reflective yoke 22 of the second spatially offset polarizing module 2 to the second polarizing beam splitter 21, and finally combined with the third polarized light beam L3 to form an output beam B, and output to the output beam B. The fourth transmission 埠P ₄ .

In Fig. 4, when the input beam A propagates from the fourth transmission 埠P ₄ to the -z direction to the second polarization depolarizing mirror 21 of the second spatially offset polarizing module 2, the input beam A is polarized by the second polarizing beam splitter. The 21-minute light is converted into a vertically polarized first polarized light beam L1 and a horizontally polarized second polarized light beam L2. The first polarized light beam L1 is reflected by the second polarizing beam splitter 21, and the second polarized light beam L2 is reflected by the second reflecting beam 22. Then, the first polarized light beam L1 and the second polarized light beam L2 are simultaneously incident on the polarization rotating element 32 of the polarization modulation module 3 and the Faraday rotator 31. When the polarization rotating element 32 and the Faraday rotator 31 respectively rotate the polarization states of the two polarized beams with respect to the transmission direction by -45 degrees and rotate by +45 degrees, the polarizations of the first polarized light beam L1 and the second polarized light beam L2 are made. The state is rotated by a total of 0 degrees, at which time the first polarized light beam L1 maintains a vertical polarization to become the fourth polarized light beam L4 while the second polarized light beam L2 maintains a horizontal polarization to become the third polarized light beam L3. Then, the fourth polarized light beam L4 is reflected by the first reflection 稜鏡12 of the first spatial depolarization module 1 to the first polarization beam splitter 11 , and finally combined with the third polarization beam L3 to form an output beam B, and output to the output beam B. The first transmission 埠 P ₁ .

The input beam A of the first transmission 埠P ₁ , the second transmission 埠 P ₂ , the third transmission 埠 P _{3 ,} and the fourth transmission 埠 P ₄ is transmitted through the polarization modulation module 3 by the arrangement of FIGS. 1 to 4 . And changing the direction of the output beam B such that the transmission optical path is the first transmission 埠P ₁ to the second transmission 埠P ₂ , the second transmission 埠P ₂ to the third transmission 埠P ₃ , and the third transmission 埠P ₃ to the fourth transmission埠P ₄ and the fourth transmission 埠P ₄ to the first transmission 埠P ₁ .

Please refer to FIG. 5 to FIG. 8 again, which is a schematic diagram of the state of the beam path after the rotation of the polarization rotating element 32 in the embodiment, which is an optical circulator with adjustable optical signal transmission direction according to the present invention. The P ₁ to P ₄ optical path diagram of the first embodiment, the P ₄ to P ₃ optical path diagram of the first embodiment of the optical circulator with adjustable optical signal transmission direction of the present invention, and the optical signal transmission direction of the present invention are adjustable. A schematic diagram of the P ₃ to P ₂ optical path of the first embodiment of the optical circulator and a P ₂ to P ₁ optical path of the first embodiment of the optical circulator with adjustable optical signal transmission direction of the present invention.

The same as the above-mentioned light propagation mode and the definition of each element, but the polarization rotation direction of the Faraday rotator 31 is set to be 45 degrees with respect to the x- axis, and the polarization rotation direction of the polarization rotation element 32 is axially rotated. It is minus 45 degrees with respect to the x- axis. Thus, in FIG. 5, when the input light beam transmitted from the first port P A ₁ + z direction to spread toward the first space offset from the first partial polarization beam splitter module 11 of the electrode 1, when the input beam is A The first polarizing beam splitter 11 splits into a first polarized light beam L1 and a second polarized light beam L2, wherein the first polarized light beam L1 and the second polarized light beam L2 respectively represent a polarization component of the vertical polarization and the horizontal polarization of the input beam A.

The first polarized light beam L1 is reflected by the first polarizing beam splitter 11 and then reflected by the first reflecting beam 12, and the second polarized light beam L2 maintains the traveling direction of the original input beam A, and is incident on the first polarized light beam L1 simultaneously. The Faraday rotator 31 and the polarization rotator 32 of the polarization modulation module 3. When the Faraday rotator 31 and the polarization rotating element 32 respectively rotate the polarization states of the first polarized light beam L1 and the second polarized light beam L2 by +45 degrees and inversely by -45 degrees with respect to the transmission direction, the first polarized light beam L1 is made. And the polarization state of the second polarized light beam L2 is rotated by a total of 0 degrees, at which time the first polarized light beam L1 maintains the vertical polarization to become the third polarized light beam L3 while the second polarized light beam L2 maintains the horizontal polarization to become the fourth polarized light beam L4. Then, the third polarized light beam L3 is reflected by the second polarizing beam splitter 21, and the fourth polarized light beam L4 is reflected by the second reflective beam 22 of the second spatially offset polarizing module 2 to the second polarizing beam splitter 21, Finally, it is combined with the third polarized light beam L3 to form an output light beam B, and is output to the fourth transmission 埠P ₄ .

In Fig. 6, the input beam A propagates from the fourth transmission 埠P ₄ to the -z direction, and is split into a vertically polarized first polarized light beam L1 and a horizontally polarized second polarized light beam L2 via a second polarizing beam splitter 21, After the second polarized light beam L2 is reflected by the second reflected beam 22, it is incident on the polarization rotating element 32 and the Faraday rotator 31 simultaneously with the first polarized light beam L1. The polarization rotation element 32 and the Faraday rotator 31 respectively rotate the first polarization beam L1 and the second polarization beam L2 by 45 degrees with respect to the transmission direction, so that the polarization states of the first polarization beam L1 and the second polarization beam L2 are collectively The rotation is +90 degrees, and the first polarized light beam L1 is converted into a horizontally polarized fourth polarized light beam L4, and the second polarized light beam L2 is converted into a vertically polarized third polarized light beam L3. Then the fourth polarizing beam L4 Prism 12 after the first reflection, and the third polarization beam L3 are combined into an output beam B, and outputs to a third port P ₃ through the transmission.

In Fig. 7, when the input beam A propagates from the third transmission 埠P ₃ to the +z direction to the first polarization depolarizing mirror 11 of the first spatially offset polarizing module 1, the input beam A is polarized by the first polarizing beam splitter. 11 is divided into a first polarized light beam L1 that is vertically polarized and a second polarized light beam L2 that is horizontally polarized. The second polarized light beam L2 is reflected by the first reflecting beam 12, and is incident on the Faraday rotator 31 and the polarization rotating element 32 of the polarization modulation module 3 simultaneously with the first polarized light beam L1. The Faraday rotator 31 and the polarization rotating element 32 respectively rotate the first polarized light beam L1 and the second polarized light beam L2 by 45 degrees and reversely by 45 degrees with respect to the transmission direction, so that the first polarized light beam L1 and the second polarized light beam L2 are rotated. The polarization state is rotated by a total of 0 degrees, at which time the first polarized light beam L1 maintains a vertical polarization to become the fourth polarized light beam L4 while the second polarized light beam L2 maintains a horizontal polarization to become the third polarized light beam L3. Then, the fourth polarized light beam L4 is reflected by the second reflected beam 22 and the second polarizing beam splitter 21, combined with the third polarized light beam L3 to form an output light beam B, and output to the second transfer port P ₂ .

In Fig. 8, when the input beam A propagates from the second transmission 埠P ₂ to the -z direction to the second polarization depolarization mirror 21 of the second spatial offset polarization module 2, the input beam A is polarized by the second polarization beam splitter. The 21-minute light is converted into a vertically polarized first polarized light beam L1 and a horizontally polarized second polarized light beam L2. The first polarized light beam L1 is reflected by the second reflecting beam 22, and is incident on the polarization rotating element 32 and the Faraday rotator 31 of the polarization modulation module 3 simultaneously with the second polarized light beam L2. The polarization rotation element 32 and the Faraday rotator 31 respectively rotate the first polarization beam L1 and the second polarization beam L2 by 45 degrees with respect to the transmission direction, so that the polarization states of the first polarization beam L1 and the second polarization beam L2 are collectively The rotation is +90 degrees, and the first polarized light beam L1 is converted into a horizontally polarized third polarized light beam L3, and the second polarized light beam L2 is converted into a vertically polarized fourth polarized light beam L4. Then, the fourth polarized light beam L4 is reflected by the first reflected beam 12 and the first polarizing beam splitter 11 and combined with the third polarized light beam L3 to form an output light beam B, and is output to the first transfer pupil P ₁ .

With the configuration of FIGS. 5 to 8, the orientation of the polarization rotation element 32 is changed by the rotation of the polarization rotation element 32, so that the first transmission port P ₁ , the second transmission port P ₂ , the third transmission port P _{3 ,} and the fourth transmission are transmitted. The input beam A and the output beam B of 埠P _{4 are} changed in direction, so that the transmission optical path is the first transmission 埠P ₁ to the fourth transmission 埠P ₄ , the fourth transmission 埠P ₄ to the third transmission 埠P ₃ , and the third transmission埠P ₃ to the second transmission 埠P ₂ and the second transmission 埠P ₂ to the first transmission 埠P ₁ . The beam transmission direction is opposite to that of FIG. 1 to FIG. 4, so that the optical circulator with adjustable optical signal transmission direction of the present invention can make the transmission direction of each transmission 可调 adjustable transmission in a single transmission space.

Please refer to Fig. 9, which is a second embodiment of the present invention. In this embodiment, the optical circulator with the adjustable transmission direction shown in FIGS. 1 to 8 is a module, and another optical circulator with the same optical signal transmission direction is stacked in the longitudinal direction, so that It has a first transmission space 100 and a second transmission space 200. And correspondingly configured by the two second polarizing beamsplitters 21 A corrugated 4 is disposed on one side, and the corrugated 4 is opposite to the two corresponding second reflecting cymbals 22, thereby guiding the optical circulator between the upper and lower stacked optical signal transmission directions Signal transmission. The state of the beam path state generated before and after the rotation of the polarization rotator 32 in the present embodiment will be described below. The figures shown in FIGS. 9 to 14 are the state before the rotation of the polarization rotator 32, and the 15th to 20th. The figure shows the state in which the polarization rotator 32 is rotated.

Please refer to FIG. 9 to FIG. 14 , which are schematic diagrams of the P ₁ to P ₂ optical path of the second embodiment of the optical circulator with adjustable optical signal transmission direction according to the present invention, and the optical signal transmission direction of the present invention is adjustable. P ₂ to P ₃ optical path diagram of the second embodiment of the optical circulator, P ₃ to P ₄ optical path diagram of the second embodiment of the optical circulator with adjustable optical signal transmission direction of the present invention, and optical signal transmission of the present invention Schematic diagram of P ₄ to P ₅ optical path of the second embodiment of the optical circulator with adjustable direction, P ₅ to P ₆ optical path diagram of the second embodiment of the optical circulator with adjustable optical signal transmission direction of the present invention, and the present invention A schematic diagram of the P ₆ to P ₁ optical path of the second embodiment of the optical circulator with adjustable optical signal transmission direction.

Here, the polarization rotation direction of the Faraday rotator 31 is set to be 45 degrees with respect to the x- axis and the axial direction of the polarization rotation element 32 is positive 45 degrees with respect to the x- axis. Wherein, Fig. 9 through FIG. 11 represent the first transmission line transmitting a first space 100 of the port to a second transmission port P ₁ P _2, P ₂ of the second transmission port to the third port P ₃ and the third transmission transfer port P ₃ to the second transmission space 200 P fourth transfer ports of the optical transmission path _4, the optical transmission path which is generally shown in FIGS. 1 to 3 of the same optical path of the first transmission to the transmission of the space 100, are not repeated here . However, the transmission optical path in FIG. 11 is deviated from the output beam B of the polarization module 2 in the second space of the first transmission space 100, and is further guided to the second transmission space 200 by the waveguide 4 . , the input beam A′ of the second transmission space 200 is formed, and the second space incident on the second transmission space 200 is separated from the polarization module 2 and split again, and the second polarization beam splitter 21 of the second transmission space 200 is input. The beam A' is split into a vertically polarized first polarized light beam L1' and a horizontally polarized second polarized light beam L2'.

The second polarized light beam L2' maintains the traveling direction of the original input beam A' and is reflected by the second reflecting beam 22, while the first polarized light beam L1' is reflected by the second polarizing beam splitter 21, and the two polarized beams are again The polarization rotator 32 and the Faraday rotator 31 of the polarization modulation module 3 incident to the second transmission space 200. The polarization rotating element 32 and the Faraday rotator 31 respectively rotate the polarization states of the first polarized light beam L1' and the second polarized light beam L2' by -45 degrees and clockwise by +45 degrees with respect to the transmission direction, so that the first polarized light beam The polarization states of L1' and the second polarized light beam L2' are rotated by a total of 0 degrees. At this time, the first polarized light beam L1' maintains the vertical polarization to become the fourth polarized light beam L4', while the second polarized light beam L2' maintains the horizontal polarization. Three polarized light beams L3'. Then, the fourth polarized light beam L4' is reflected to the first polarizing beam splitter 11 via the first reflecting beam 12 in the second transmission space 200, and finally the third polarized light beam L3' is combined into an output beam B', and output to the first Four transmissions 埠 P ₄ .

In Fig. 12, the input beam A is propagated from the fourth transmission 埠P ₄ to the +z direction to the first spatial deviation of the second transmission space 200, and the input beam A is split by the first polarization beam splitter 11. The first polarized light beam L1 is vertically polarized and the second polarized light beam L2 is horizontally polarized. The second polarized light beam L2 maintains the traveling direction of the original input beam A, and the first polarized light beam L1 is reflected by the first polarizing beam splitter 11 and then reflected by the first reflecting beam 12, and then the first polarized light beam L1 and the first The two polarized light beams L2 are simultaneously incident on the Faraday rotator 31 and the polarization rotating element 32 of the polarization modulation module 3. The Faraday rotator 31 and the polarization rotator 32 respectively rotate the polarization states of the first polarization beam L1 and the second polarization beam L2 by +45 degrees with respect to the transmission direction, so that the first polarization beam L1 and the second polarization beam L2 are rotated. The polarization state is rotated by +90 degrees in total, when the first polarized light beam L1 is converted into a horizontally polarized third polarized light beam L3, while the second polarized light beam L2 is converted into a vertically polarized fourth polarized light beam L4. The fourth polarized light beam L4 is reflected to the second polarized beam splitter 21 via the second reflection 稜鏡 22 of the second transmission space 200, and finally combined with the third polarized light beam L3 to form an output beam B, and output to the fifth transmission 埠P. ₅ .

FIG 13, the transmission input light beam A fifth port P ₅ propagate toward the -z direction to the second space of the second space 200 of the transmission polarization departing from the module 2, a second polarizing beam splitter 21 via the input beam A spectrophotometric The first polarized light beam L1 is vertically polarized and the second polarized light beam L2 is horizontally polarized. The second polarized light beam L2 maintains the traveling direction of the original input beam A, and the first polarized light beam L1 is reflected by the second polarizing beam splitter 21 and then reflected by the second reflecting beam 22. Then, the first polarized light beam L1 and the second polarized light beam L2 are simultaneously incident on the polarization rotating element 32 of the polarization modulation module 3 and the Faraday rotator 31. The polarization rotation element 32 and the Faraday rotator 31 respectively rotate the polarization states of the first polarization beam L1 and the second polarization beam L2 by -45 degrees and clockwise by +45 degrees with respect to the transmission direction, so that the first polarization beam L1 and The polarization state of the second polarized light beam L2 is rotated by a total of 0 degrees, at which time the first polarized light beam L1 maintains the vertical polarization to become the third polarized light beam L3 while the second polarized light beam L2 maintains the horizontal polarization to become the fourth polarized light beam L4. Then, the fourth polarized light beam L4 is reflected to the first polarizing beam splitter 11 via the first reflecting beam 12 of the second transmission space 200, and finally combined with the third polarized light beam L3 to form an output beam B, and output to the sixth transmission beam. P ₆ .

In Fig. 14, the input beam A is propagated from the sixth transmission 埠P ₆ to the +z direction to the first spatial deviation of the second transmission space 200, and the input beam A is split by the first polarization beam splitter 11. The first polarized light beam L1 is vertically polarized and the second polarized light beam L2 is horizontally polarized. The first polarized light beam L1 is reflected by the first polarizing beam splitter 11, and the second polarized light beam L2 maintains the traveling direction of the original input light beam A and is reflected by the first reflecting beam 12. Then, the first polarized light beam L1 and the second polarized light beam L2 are simultaneously incident on the Faraday rotator 31 and the polarization rotating element 32 of the polarization modulation module 3. The Faraday rotator 31 and the polarization rotator 32 respectively rotate the polarization states of the first polarization beam L1 and the second polarization beam L2 by +45 degrees with respect to the transmission direction, so that the first polarization beam L1 and the second polarization beam L2 are rotated. The polarization state is rotated by +90 degrees in total, when the first polarized light beam L1 is converted into the horizontally polarized fourth polarized light beam L4, while the second polarized light beam L2 is converted into the vertically polarized third polarized light beam L3. The fourth polarized light beam L4 is reflected by the second reflecting beam 22 to the second polarizing beam splitter 21, and finally combined with the third polarized light beam L3 to form an output beam B, and is output to the wave 稜鏡4.

The bellows 4 reflects the output beam B of the second transmission space 200, making it the input beam A' of the first transmission space 100. The input beam A' is again split into a vertically polarized first polarized light beam L1' and a horizontally polarized second polarized light beam L2' via a second polarizing beam splitter 21 of the first spatial transmission space 100. . The second polarized light beam L2' maintains the traveling direction of the original input beam A' and is reflected by the second reflecting beam 22. Then, the first polarized light beam L1' and the second polarized light beam L2' are simultaneously incident on the polarization rotating element 32 of the polarization modulation module 3 and the Faraday rotator 31. The polarization rotating element 32 and the Faraday rotator 31 respectively rotate the polarization states of the first polarized light beam L1' and the second polarized light beam L2' by -45 degrees and clockwise by +45 degrees with respect to the transmission direction, so that the first polarized light beam The polarization states of L1' and the second polarized light beam L2' are rotated by a total of 0 degrees. At this time, the first polarized light beam L1' maintains the vertical polarization to become the fourth polarized light beam L4', while the second polarized light beam L2' maintains the horizontal polarization. Three polarized light beams L3'. Then, the fourth polarized light beam L4' is reflected to the first polarizing beam splitter 11 via the first reflecting beam 12 of the first transmission space 100, and finally combined with the third polarized light beam L3' to form an output beam B', and output to the first A transmission 埠 P ₁ .

With the configuration of Figures 9 to 14, the optical circulators with adjustable optical signal transmission direction are stacked vertically, so that the signals can be easily transmitted in different transmission spaces. Referring to FIG. 15 to FIG. 20 again, FIG. 15 is a schematic diagram showing changes in the state of the beam path after the rotation of the polarization rotating element 32 in the embodiment, which is the second optical circulator with adjustable optical signal transmission direction according to the present invention. The P ₁ to P ₆ optical path diagram of the embodiment, the P ₆ to P ₅ optical path diagram of the second embodiment of the optical circulator with adjustable optical signal transmission direction of the present invention, and the optical cycle with adjustable optical signal transmission direction of the present invention The P ₅ to P ₄ optical path diagram of the second embodiment of the present invention, the P ₄ to P ₃ optical path diagram of the second embodiment of the optical circulator with adjustable optical signal transmission direction of the present invention, and the optical signal transmission direction of the present invention can be A schematic diagram of the P ₃ to P ₂ optical path of the second embodiment of the optical circulator and the P ₂ to P ₁ optical path of the second embodiment of the optical circulator with adjustable optical signal transmission direction of the present invention.

The same as the above-mentioned light propagation mode and the definition of each element, but the polarization rotation direction of the Faraday rotator 31 is set to be 45 degrees with respect to the x- axis, and the polarization rotation direction of the polarization rotation element 32 is axially rotated. It is minus 45 degrees with respect to the x- axis. Therefore, in FIG. 15, the input beam A P ₁ transmitted by the first transmission port to the + z direction to the first transmission of the first space 100 deviates from the polarization spatial module 1, the input 11 via a first polarizing beam splitter The beam A is divided into a vertically polarized first polarized light beam L1 and a horizontally polarized second polarized light beam L2. The second polarized light beam L2 maintains the traveling direction of the original input beam A, and the first polarized light beam L1 is reflected by the first polarizing beam splitter 11 and then reflected by the first reflecting beam 12. Then, the first polarized light beam L1 and the second polarized light beam L2 are simultaneously incident on the Faraday rotator 31 and the polarization rotating element 32 of the polarization modulation module 3. The Faraday rotator 31 and the polarization rotator 32 respectively rotate the polarization states of the first polarized light beam L1 and the second polarized light beam L2 by +45 degrees and inversely by -45 degrees with respect to the transmission direction, so that the first polarized light beam L1 and The polarization state of the second polarized light beam L2 is rotated by a total of 0 degrees, at which time the first polarized light beam L1 maintains the vertical polarization to become the third polarized light beam L3 while the second polarized light beam L2 maintains the horizontal polarization to become the fourth polarized light beam L4. The third polarized light beam L3 is reflected by the second polarizing beam splitter 21 of the first transmission space 100, and the fourth polarized light beam L4 is reflected by the second reflecting beam 22 to the second polarizing beam splitter 21, and finally with the third polarization. The light beam L3 is combined into an output beam B and output to the wave 稜鏡4.

Next, the Borox 4 directs the output beam B to reflect into the second transmission space 200, making it the input beam A' of the second transmission space 200. The input beam A' is again split into a vertically polarized first polarized light beam L1' and a horizontally polarized second polarized light beam L2' via a second second polarizing beam splitter 21 of the second spatially offset polarizing module 2. The second polarized light beam L2 ′ is reflected by the second reflected light ray 22 , and is incident on the polarization rotating element 32 and the Faraday rotator 31 of the polarization modulation module 3 simultaneously with the first polarized light beam L1 ′. The polarization rotation element 32 and the Faraday rotator 31 respectively rotate the polarization states of the first polarization beam L1' and the second polarization beam L2' by +45 degrees with respect to the transmission direction, so that the first polarization beam L1' and the second polarization The polarization state of the light beam L2' is rotated by +90 degrees in total, when the first polarized light beam L1' is transformed into the horizontally polarized fourth polarized light beam L4', and the second polarized light beam L2' is transformed into the third vertically polarized light. Polarized beam L3'. The fourth polarized light beam L4' is reflected to the first polarizing beam splitter 11 via the first reflecting beam 12 of the second transmission space 200, and finally combined with the third polarized light beam L3' to form an output beam B', and output to the sixth Transfer 埠P ₆ .

In Fig. 16, the input beam A is propagated from the sixth transmission 埠P ₆ to the +z direction to the first spatial deviation of the second transmission space 200, and the input beam A is split by the first polarization beam splitter 11. The first polarized light beam L1 is vertically polarized and the second polarized light beam L2 is horizontally polarized. The second polarized light beam L2 maintains the traveling direction of the original input beam A and is reflected by the first reflecting beam 12, and the first polarized beam L1 is reflected by the first polarizing beam splitter 11. Then, the first polarized light beam L1 and the second polarized light beam L2 are simultaneously incident on the Faraday rotator 31 and the polarization rotating element 32 of the polarization modulation module 3. The Faraday rotator 31 and the polarization rotator 32 respectively rotate the polarization states of the first polarized light beam L1 and the second polarized light beam L2 by +45 degrees and inversely by -45 degrees with respect to the transmission direction, so that the first polarized light beam L1 and The polarization state of the second polarized light beam L2 is rotated by a total of 0 degrees, at which time the first polarized light beam L1 maintains a vertical polarization to become the fourth polarized light beam L4 while the second polarized light beam L2 maintains the horizontal polarization to become the third polarized light beam L3. The fourth polarizing beam L4 reflected by the second reflector 22 to a second Prism after the polarizing beam splitter 21, and finally to the third polarization beam L3 combined into an output light beam B, and outputs to the fifth transfer port P _5.

In Fig. 17, the input beam A propagates from the fifth transmission 埠P ₅ to the -z direction into the second spatial deviation of the second transmission space 200 from the polarization module 2, and is split into vertical polarization via the second polarization beam splitter 21. The first polarized light beam L1 and the horizontally polarized second polarized light beam L2, and the first polarized light beam L1 is reflected by the second reflective beam 22, and simultaneously incident on the polarization rotating element of the polarization modulation module 3 with the second polarized light beam L2 32 and Faraday rotator 31. The polarization rotation element 32 and the Faraday rotator 31 respectively rotate the first polarization beam L1 and the second polarization beam L2 by 45 degrees with respect to the transmission direction, so that the polarization states of the first polarization beam L1 and the second polarization beam L2 are collectively Rotating +90 degrees, and converting the first polarized light beam L1 into a horizontally polarized third polarized light beam L3, the second polarized light beam L2 is converted into a vertically polarized fourth polarized light beam L4, and the fourth polarized light beam L4 is transmitted through the first reflection After being reflected to the first polarization beam splitter 11, the 稜鏡12 is finally combined with the third polarization beam L3 into an output beam B, and output to the fourth transmission 埠P ₄ .

FIG. 18, the input beam A P ₄ transmitted by the fourth port to propagate the + z direction to the first space of the second space 200 of the transmission polarization departing from the module 1, the input light beam via a first beam splitter A polarizing beam splitter 11 The first polarized light beam L1 is vertically polarized and the second polarized light beam L2 is horizontally polarized. The second polarized light beam L2 maintains the traveling direction of the original input beam A, and the first polarized light beam L1 is reflected by the first polarizing beam splitter 11 and the first reflecting beam 12. Then, the first polarized light beam L1 and the second polarized light beam L2 are simultaneously incident on the Faraday rotator 31 and the polarization rotating element 32 of the polarization modulation module 3. The Faraday rotator 31 and the polarization rotator 32 respectively rotate the polarization states of the first polarized light beam L1 and the second polarized light beam L2 by +45 degrees and inversely by -45 degrees with respect to the transmission direction, so that the first polarized light beam L1 and The polarization state of the second polarized light beam L2 is rotated by a total of 0 degrees, at which time the first polarized light beam L1 maintains the vertical polarization to become the third polarized light beam L3 while the second polarized light beam L2 maintains the horizontal polarization to become the fourth polarized light beam L4. The third polarized light beam L3 is reflected by the second polarizing beam splitter 21, and the fourth polarized light beam L4 is reflected by the second reflecting beam 22 to the second polarizing beam splitter 21, and finally combined with the third polarized light beam L3 to form an output beam. B, and output to Polo 稜鏡 4.

Next, the Pole 4 directs the output beam B to reflect into the first transmission space 100, making it the input beam A' of the first transmission space 100. The input beam A' is again split into a vertically polarized first polarized light beam L1' and a horizontally polarized second polarized light beam L2' via a second second polarizing beam splitter 21 of the second spatially offset polarizing module 2. The second polarized light beam L2 ′ is reflected by the second reflected light ray 22 , and is incident on the polarization rotating element 32 and the Faraday rotator 31 of the polarization modulation module 3 simultaneously with the first polarized light beam L1 ′. The polarization rotation element 32 and the Faraday rotator 31 respectively rotate the polarization states of the first polarization beam L1' and the second polarization beam L2' by +45 degrees with respect to the transmission direction, so that the first polarization beam L1' and the second polarization The polarization state of the light beam L2' is rotated by +90 degrees in total, when the first polarized light beam L1' is transformed into the horizontally polarized fourth polarized light beam L4', and the second polarized light beam L2' is transformed into the third vertically polarized light. Polarized beam L3'. The fourth polarizing beam L4 'reflected by the first reflection Prism 12 to the first polarizing beam splitter 11, and finally to the third polarization beam L3' are combined into one output beam B ', and the transmission output to the third port P _3.

In Fig. 19, the input beam A is propagated from the third transmission 埠P ₃ to the +z direction to the first spatial deviation polarization module 1 of the first transmission space 100, and the input beam A is split by the first polarization beam splitter 11. The first polarized light beam L1 is vertically polarized and the second polarized light beam L2 is horizontally polarized. The second polarized light beam L2 maintains the traveling direction of the original input light beam A and is reflected by the first reflected light ray 12, and the first polarized light beam L1 is reflected by the first polarizing beam splitter 11. Then, the first polarized light beam L1 and the second polarized light beam L2 are simultaneously incident on the Faraday rotator 31 and the polarization rotating element 32 of the polarization modulation module 3. The Faraday rotator 31 and the polarization rotator 32 respectively rotate the polarization states of the first polarized light beam L1 and the second polarized light beam L2 by +45 degrees and inversely by -45 degrees with respect to the transmission direction, so that the first polarized light beam L1 and The polarization state of the second polarized light beam L2 is rotated by a total of 0 degrees, at which time the first polarized light beam L1 maintains a vertical polarization to become the fourth polarized light beam L4 while the second polarized light beam L2 maintains the horizontal polarization to become the third polarized light beam L3. The fourth polarized light beam L4 is reflected by the second reflecting beam 22 to the second polarizing beam splitter 21, and finally combined with the third polarized light beam L3 to form an output beam B, and is output to the second transfer port P ₂ .

In Fig. 20, the input beam A propagates from the second transmission 埠P ₂ to the -z direction to the second spatial deviation of the first transmission space 100 from the polarization module 2, and the input beam A is split by the second polarization beam splitter 21. The first polarized light beam L1 is vertically polarized and the second polarized light beam L2 is horizontally polarized. The second polarized light beam L2 maintains the traveling direction of the original input beam A, and the first polarized light beam L1 is reflected by the second polarized beam splitter 21 and the second reflected beam 22, and simultaneously incident on the polarization modulated mode with the second polarized light beam L2. The polarization rotating element 32 of the group 3 and the Faraday rotator 31. The polarization rotation element 32 and the Faraday rotator 31 respectively rotate the first polarization beam L1 and the second polarization beam L2 by 45 degrees with respect to the transmission direction, so that the polarization states of the first polarization beam L1 and the second polarization beam L2 are collectively Rotating +90 degrees, and converting the first polarized light beam L1 into a horizontally polarized third polarized light beam L3, and the second polarized light beam L2 is converted into a vertically polarized fourth polarized light beam L4, and the fourth polarized light beam L4 is first After the reflection 稜鏡12 and the first polarization beam splitter 11 are reflected, they are finally combined with the third polarization beam L3 to form an output beam B, and output to the first transmission 埠P ₁ .

Through the configuration of FIG. 9 to FIG. 20, it can be seen that the optical circulator with adjustable optical signal transmission direction of the present invention is longitudinally stacked, and the orientation of the polarization rotator is changed by the rotation of the polarization rotator 32, thereby modulating the polarization of the polarized beam. The state, together with the Polo 4, enables each transmission to easily achieve an adjustable transmission in the transmission direction, so that the signal can be transmitted from the first transmission 埠P ₁ to the second transmission 埠P ₂ and the second transmission 埠P ₂ to a third transmission port P ₃ , a third transmission port P ₃ to a fourth transmission port P ₄ , a fourth transmission port P ₄ to a fifth transmission port P ₅ , a fifth transmission port P ₅ to a sixth transmission port P ₆ , and a a transmission port P ₆ to the first transmission port P ₁ ; or a first transmission port P ₁ to a sixth transmission port P ₆ , a sixth transmission port P ₆ to a fifth transmission port P ₅ , and a fifth transmission port P ₅ to a path of the fourth transmission port P ₄ , the fourth transmission port P ₄ to the third transmission port P ₃ , the third transmission port P ₃ to the second transmission port P ₂ , and the second transmission port P ₂ to the first transmission port P ₁ transmission.

Please refer to Fig. 21, which is a third embodiment of the present invention. This embodiment is substantially the same as the technology of the first embodiment. The difference between the two is only in the embodiment. The polarization modulation module 3 cannot pull the configuration of the rotator, and only the polarization rotation component 32 is used to modulate the polarization state of the polarized beam. The polarization rotating component 32 can be a half wave plate or a twisted nematic liquid crystal cell, and can be rotated by a third angle according to the setting of the polarization rotating component 32. The remaining configurations are the same as the first implementation. The example is the same.

Please refer to FIG. 21 to FIG. 28, which are respectively a P ₁ to P ₂ optical path diagram of the third embodiment of the optical circulator with adjustable optical signal transmission direction of the present invention, and the optical signal transmission direction of the present invention can be P ₂ to P ₃ optical path diagram of the third embodiment of the optical circulator, P ₃ to P ₄ optical path diagram of the third embodiment of the optical circulator with adjustable optical signal transmission direction of the present invention, light of the present invention The P ₄ to P ₁ optical path diagram of the third embodiment of the optical circulator with adjustable signal transmission direction, and the P ₁ to P ₄ optical path diagram of the third embodiment of the optical circulator with adjustable optical signal transmission direction of the present invention, P Example of third embodiment of the tunable optical signal transmitting direction of the optical circulator of the present invention, the optical path ₄ to P ₃ a schematic view, according to the present invention the adjustable light transmission direction of the signal P of a third embodiment of an optical circulator ₃ to P _{2 is a} schematic diagram of the P ₂ to P ₁ optical path of the third embodiment of the optical circulator with the adjustable optical transmission direction of the present invention. By the arrangement of the polarization rotating element 32, in the 21st to 24th drawings, when the input beam A propagates into the optical circulator whose optical signal transmission direction is adjustable, the input beam A first passes through the polarizing beam splitter to input the beam A. The splitting is a vertically polarized first polarized light beam L1 and a horizontally polarized second polarized light beam L2, and is incident on the polarization rotating element 32, thereby modulating the polarization states of the first polarized light beam L1 and the second polarized light beam L2. On the other hand, in Figs. 25 to 28, by the rotation of the polarization rotation element 32, the polarization state of the transmission beam can be rotated by 0 or 90 degrees, and finally the output direction of the output beam B is changed.

According to the order of the 21st to 28th drawings, the input beam A is respectively composed of the first transmission port P ₁ , the second transmission port P ₂ , the third transmission port P ₃ and the fourth transmission port P ₄ and the first transmission port. P ₁ , the fourth transmission 埠 P ₄ , the third transmission 埠 P _{3 ,} and the second transmission 埠 P ₂ sequentially transmit in the +z direction or the −z direction. When the input beam A is transmitted in the +z direction, the input beam A is split by the first polarization beam splitter 11 that is offset from the polarization module 1 by the first space; when the input beam A is transmitted in the -z direction, the The second polarizing beam splitter 21, which is spatially offset from the polarizing module 2, splits the input beam A. The input beam A is split into a vertically polarized first polarized light beam L1 and a horizontally polarized second polarized light beam L2, and then enters the polarization rotating element 32, thereby modulating the polarization states of the first polarized light beam L1 and the second polarized light beam L2.

And according to the order of FIG. 21 to FIG. 28, the polarization rotation element 32 is rotated by 90 degrees, 0 degrees, 90 degrees, 0 degrees, 0 degrees, 90 degrees, 0 degrees, and 90 degrees in sequence, when polarization is performed. When the rotating element 32 is rotated 90 degrees in time, the polarization state of the vertically polarized first polarized light beam L1 and the horizontally polarized second polarized light beam L2 will be deflected by 90 degrees, at which time the first polarized light beam L1 is converted to horizontal polarization, and the second The polarized light beam L2 is converted into a vertical polarization to form a third polarized light beam L3 and a fourth polarized light beam L4. Here, for convenience of interpretation, the polarized light beam incident on the first polarizing beam splitter 11 (or incident on the second polarizing beam splitter 21) is defined as the third polarized light beam L3, and is incident on the first reflecting pupil 12 (or The polarized light beam incident on the second reflective yoke 22) is defined as a fourth polarized light beam L4, and the fourth polarized light beam L4 is reflected through the first reflective 稜鏡12 (or the second reflected 稜鏡22) into the first polarized beam splitter 11 (or second polarizing beam splitter 21), finally combined with the third polarized light beam L3 as an output beam B, and sequentially transmitted to the other transmission port.

With this configuration, the polarization state of the first polarized light beam L1 and the second polarized light beam L2 can be adjusted by the rotation of the single polarization rotating element 32, and the output direction of the output light beam B is further changed, thereby completing the first implementation. The same optical path is transmitted.

Please refer to FIG. 29 to FIG. 40, which are respectively a P ₁ to P ₂ optical path diagram of the fourth embodiment of the optical circulator with adjustable optical signal transmission direction of the present invention, and the optical signal transmission direction of the present invention. Schematic diagram of P ₂ to P ₃ optical path of the fourth embodiment of the adjustable optical circulator, P ₃ to P ₄ optical path diagram of the fourth embodiment of the optical circulator with adjustable optical signal transmission direction of the present invention, and the present invention Schematic diagram of the P ₄ to P ₅ optical path of the fourth embodiment of the optical circulator with adjustable optical transmission direction, and the P ₅ to P ₆ optical path of the fourth embodiment of the optical circulator with adjustable optical signal transmission direction of the present invention And a P ₆ to P ₁ optical path diagram of the fourth embodiment of the optical circulator with adjustable optical signal transmission direction of the present invention, and P ₁ to the fourth embodiment of the optical circulator with adjustable optical signal transmission direction of the present invention P ₆ optical path diagram, P ₆ to P ₅ optical path diagram of the fourth embodiment of the optical circulator with adjustable optical signal transmission direction of the present invention, and fourth embodiment of the optical circulator with adjustable optical signal transmission direction of the present invention P ₅ to P ₄ optical path diagram, this P ₄ to P ₃ optical path diagram of the fourth embodiment of the optical circulator with adjustable optical signal transmission direction, P ₃ to P ₂ of the fourth embodiment of the optical circulator with adjustable optical signal transmission direction of the present invention FIG. _{2 is a} schematic diagram of the P ₂ to P ₁ optical path of the fourth embodiment of the optical circulator with the adjustable optical transmission direction of the present invention.

Similarly to the third embodiment, the polarization states of the first polarized light beam L1 and the second polarized light beam L2 can be modulated by the rotation of the single polarization rotating element 32, and the output direction of the output light beam B is further changed. Therefore, the fourth embodiment is substantially the same as the second embodiment except that the polarization modulation module 3 of the fourth embodiment does not have a Faraday rotator, and only the polarization rotation element 32 is provided to modulate the polarization of each polarization beam. status.

Similar to the second embodiment, and referring to FIGS. 29 to 40, the transmission path of the fourth embodiment is also the first transmission 埠P ₁ to the second transmission 埠P ₂ and the second transmission 埠P ₂ to the third transmission.埠P ₃ , third transmission 埠 P ₃ to fourth transmission 埠 P ₄ , fourth transmission 埠 P ₄ to fifth transmission 埠 P ₅ , fifth transmission 埠 P ₅ to sixth transmission 埠 P ₆ , and sixth transmission埠P ₆ to the first transmission 埠P ₁ ; or the first transmission 埠P ₁ to the sixth transmission 埠P ₆ , the sixth transmission 埠P ₆ to the fifth transmission 埠P ₅ , and the fifth transmission 埠P ₅ to the fourth transmission埠P ₄ , the fourth transmission 埠 P ₄ to the third transmission 埠 P ₃ , the third transmission 埠 P ₃ to the second transmission 埠 P ₂ , and the second transmission 埠 P ₂ to the path of the first transmission 埠 P _{1 are} transmitted.

According to the sequence of the 29th to 40th drawings, the polarization rotation element 32 sequentially rotates the first transmission space 100 by 90 degrees (Fig. 29), and the first transmission space 100 rotates by 0 degrees (Fig. 30). The first transmission space 100 is rotated by 90 degrees and the second transmission space 200 is rotated by 0 degrees (Fig. 31), the second transmission space 200 is rotated by 90 degrees (Fig. 32), and the second transmission space 200 is rotated by 0 degrees (Fig. 33). The second transmission space 200 is rotated 90 degrees in time and the first transmission space 100 is rotated by 0 degrees (FIG. 34), the first transmission space 100 is rotated by 0 degrees, and the second transmission space 200 is rotated by 90 degrees (FIG. 35). The second transmission space 200 is rotated by 0 degrees (Fig. 36), the second transmission space 200 is rotated by 90 degrees (Fig. 37), the second transmission space 200 is rotated by 0 degrees, and the first transmission space 100 is rotated by 90 degrees. (Fig. 38), the first transmission space 100 is rotated by 0 degrees (Fig. 39), and the first transmission space 100 is rotated by 90 degrees (Fig. 40).

When the input beam A propagates into the optical circulator with adjustable optical signal transmission direction, the input beam A is first split by the polarizing beam splitter into a vertically polarized first polarized light beam L1 and a horizontally polarized second polarized light beam L2, and then incident to The polarization rotation element 32 thereby modulates the polarization states of the first polarization beam L1 and the second polarization beam L2. The rotation of the polarization rotator 32 causes the polarization state of the transmitted beam to be rotated by 0 or 90 degrees, thereby changing the direction of the output beam B. According to the above rotation sequence, when the polarization rotating element 32 is smooth When rotated by 90 degrees, the polarization state of the vertically polarized first polarized light beam L1 and the horizontally polarized second polarized light beam L2 will be deflected by 90 degrees, at which time the first polarized light beam L1 is converted to horizontal polarization and the second polarized light beam L2 is converted. For vertical polarization, a third polarized light beam L3 and a fourth polarized light beam L4 are formed. Here, for convenience of interpretation, the polarized light beam incident on the first polarizing beam splitter 11 (or incident on the second polarizing beam splitter 21) is defined as the third polarized light beam L3, and is incident on the first reflecting pupil 12 (or The polarized light beam incident on the second reflective yoke 22) is defined as a fourth polarized light beam L4, and the fourth polarized light beam L4 is reflected through the first reflective 稜鏡12 (or the second reflected 稜鏡22) into the first polarized beam splitter 11 (or the second polarizing beam splitter 21) is combined with the third polarized light beam L3 as an output beam B, and sequentially transmitted toward the other transmission port or the wave.

If the output beam B is transmitted to the Pole 4, it is guided by the Pole 4, and this output beam B is reflected into another transmission space (longitudinally adjacent upper or lower transmission space) to become another transmission. The input beam A' of space is again split into a vertically polarized first polarized light beam L1' and a horizontally polarized second polarized light beam L2' via a polarizing beam splitter, and again via a polarization rotating element 32 in the corresponding transmission space. The polarization states of the vertically polarized first polarized light beam L1' and the horizontally polarized second polarized light beam L2' are modulated to form a third polarized light beam L3' and a fourth polarized light beam L4'. For convenience of interpretation, the polarized beam incident on the first polarizing beam splitter 11 (or incident on the second polarizing beam splitter 21) is defined as the third polarized light beam L3', and the incident first is reflected to the 稜鏡12 (or incident) The polarized light beam to the second reflective yoke 22) is defined as the fourth polarized light beam L4', and the fourth polarized light beam L4' is transmitted through the first reversed beam The shot 12 (or the second reflector 22) is reflected into the first polarizing beam splitter 11 (or the second polarizing beam splitter 21), and finally combined with the third polarized beam L3' as an output beam B', and The output is transmitted towards another transmission.

Through the above-described configuration of the fourth embodiment, so that the signal can be 100, 200 and a second space transmission port P for transmission a first transmission direction between transmission port ₁ to 6 P ₆ as their transmission in a first transmission port of stacked longitudinal space Modulated transmission.

In addition, please refer to FIG. 41 to FIG. 43 and FIG. 44 to FIG. 46, wherein FIG. 41 to FIG. 43 are longitudinal views of the fifth embodiment of the optical circulator with adjustable optical signal transmission direction according to the present invention. Stack diagram, P _(4+2N) to P ₁ optical path diagram of the fifth embodiment of the optical circulator with adjustable optical signal transmission direction of the present invention, and fifth of the optical circulator with adjustable optical signal transmission direction of the present invention P ₁ to P _(4+2N) optical path diagram of the embodiment; FIG. 44 to FIG. 46 are longitudinal stacking diagrams of the sixth embodiment of the optical circulator with adjustable optical signal transmission direction of the present invention, and the present invention Example of a sixth P P _{(4 + 2N)} of the sixth embodiment of the tunable optical signal transmission direction of the optical circulator P ₁ adjusted to the light path and an optical schematic diagram of signal transmission of the present invention the direction of the optical circulator ₁ P _(4+2N) light path diagram.

The fifth embodiment is a second embodiment for continuing to stack the optical circulators whose optical signal transmission direction is adjustable as shown in the first embodiment, and the sixth embodiment is the fourth embodiment for continuing the vertical stacking as the third embodiment. The optical circulator with adjustable optical signal transmission direction is shown in the example. In order to enable the signal to be tunably transmitted in each transmission space, the arrangement of the cymbal 4 will be sequentially arranged in the first transmission space 100 and the second polarization beam splitter 21 of the second transmission space 200. The other side of the second reflection 稜鏡 22 is further disposed on the other side of the first reflection 稜鏡 12 of the second transmission space 200 and the third transmission space, and so on. When the N-layer transmission space is stacked, there are (4+2N) transmission ports, and the path of the optical path transmission is the first transmission 埠P ₁ to the second transmission 埠P ₂ and the second transmission 埠P ₂ to the third transmission 埠P ₃ , third transmission 埠 P ₃ to fourth transmission 埠 P ₄ ..., (4+2N)-1 transmission 埠P _(4+2N)-1 to (4+2N) transmission 埠P _{(4+2N )} and the (4+2N) transmission 埠P _(4+2N) to the first transmission 埠P ₁ , or the first transmission 埠P ₁ to the (4+2N) transmission 埠P _(4+2N) , and (4+2N) transmission 埠P _(4+2N) to (4+2N)-1 transmission 埠P _(4+2N)-1 ... fourth transmission 埠P ₄ to third transmission 埠P ₃ , third transmission埠P ₃ to the second transmission 埠P ₂ and the second transmission 埠P ₂ to the first transmission 埠P ₁ . The path and the manner of the optical path transmission are the same as those of the second embodiment or the fourth embodiment, and the roles of the polarization modulation module 3 are the same as those described above, and are not described herein again.

With the configuration of the fifth embodiment and the sixth embodiment, the signal can be transmitted in an adjustable direction in an unlimited number of transmission spaces and between different transmission ports.

The above is intended to be illustrative only and not limiting. Any equivalent modifications or alterations to the spirit and scope of the invention are intended to be included in the scope of the appended claims.

1‧‧‧First space deviation from the pole module

11‧‧‧First polarized beam splitter

12‧‧‧First reflection

2‧‧‧Second space deviation depolarization module

21‧‧‧Second polarized beam splitter

22‧‧‧Second Reflector

3‧‧‧Polarization Modulation Module

31‧‧‧Faraday rotator

32‧‧‧Polarization rotating element

A‧‧‧Input beam

B‧‧‧Output beam

L1‧‧‧First polarized beam

L2‧‧‧second polarized beam

L3‧‧‧third polarized beam

L4‧‧‧4th polarized beam

P ₁ ‧‧‧First transmission埠

P ₂ ‧‧‧Second transmission埠

Claims (9)

An optical circulator with adjustable optical signal transmission direction is disposed in at least one transmission space, and the at least one transmission space has a plurality of transmission ports, and the optical circulator with adjustable optical signal transmission direction includes: a first space Deviating from the polarization module; a polarization rotation element capable of modulating the optical axis angle; and a second spatial deviation from the polarization module, the polarization rotation element being disposed in the first spatial deviation polarization module and the second spatial deviation Between the polarized modules; wherein one of the transmissions outputs an input beam to the first spatially offset polarizing module, and outputs an output beam from the second spatial depolarization module via the polarization rotating element Transmitting to another of the transmission ports, or causing one of the transmissions to output the input beam to the second spatially offset polarized module, outputting the output via the polarization rotating element and deviating from the first spatial depolarization module Transmitting a beam to another of the transmission ports, wherein the polarization state of the input beam is modulated by the polarization rotation element to change an output direction of the output beam, the input beam and the output beam The at least one transmission space is made adjustable transmission. An optical circulator capable of adjusting an optical signal transmission direction according to claim 1, wherein when the transmission space is one of the lowest transmission areas, the number of the plurality of transmission ports is four P1, P2, P3, and P4 are sequentially arranged, and the transmission paths of the input beam and the output beam in the first transmission space are P1 to P2, P2 to P3, P3 to P4, and P4 by the polarization rotating element. To P1, or P1 to P4, P4 to P3, P3 to P2, and P2 to P1. An optical circulator capable of adjusting an optical signal transmission direction according to claim 2, wherein the number of the transmission spaces is N, and the N transmission spaces are vertically stacked from the bottommost first transmission space. The number of the plurality of transmission ports is (4+2N), and each of the transmission spaces has an optical circulator with an adjustable optical signal transmission direction, and the optical circulator with the adjustable optical signal transmission direction further includes at least one The 波 稜鏡 稜鏡 稜鏡 稜鏡 稜鏡 稜鏡 稜鏡 稜鏡 稜鏡 稜鏡 稜鏡 稜鏡 波 波 波 波 波 波 波 波 之一 之一 之一 之一 之一 之一 之一 之一 之一 之一 之一 之一 之一 之一 之一 之一 之一 之一 之一Receiving one of the output beams of the transmission space, and reflecting the output beam to another transmission space for transmission, so that the transmission path is P1 to P2, P2 to P3, P3 to P4, ..., P(4+2N )-1 to P(4+2N) and P(4+2N) to P1, or P1 to P(4+2N), and P(4+2N) to P(4+2N)-1...P4 to P3 , P3 to P2 and P2 to P1. An optical circulator capable of adjusting an optical signal transmission direction according to claim 3, wherein the first space deviates from the polarization module, and receives the input beam of one of the transmission ports, and inputs the input beam The light beam is divided into a first polarized light beam and a second polarized light beam; the polarization rotating element is adjacent to the first spatially offset polarizing module, and the polarization rotating element receives the first polarized light beam and the second polarized light beam And modulating a polarization state of the first polarized light beam and the second polarized light beam to output a third polarized light beam and a fourth polarized light beam; The second spatial deviation from the polarization module is configured corresponding to the first spatial deviation from the polarization module, and the second spatial deviation from the polarization module receives the third polarized light beam and the fourth polarized light beam to make the fourth The polarized light is combined with the third polarized beam to form the output beam and output, and an output direction of the output beam is changed according to polarization states of the third polarized beam and the fourth polarized beam. An optical circulator capable of adjusting an optical signal transmission direction according to claim 4, wherein the first spatial deviation from the polarization module comprises: a first polarization beam splitter that receives the input beam and The input beam is divided into the first polarized beam and the second polarized beam; and a first reflective 稜鏡 is disposed on one side of the first polarizing beam splitter, and the first reflecting 稜鏡 receives and reflects the first The polarized beam or the second polarized beam is such that the traveling paths of the first polarized beam and the second polarized beam are parallel to each other. An optical circulator capable of adjusting an optical signal transmission direction according to claim 5, wherein the second space is offset from the polarization module, and the first space is offset from the polarization module by the polarization module. The second spatially offset polarizing module includes: a second polarizing beam splitter that receives the third polarized light beam; and a second reflective beam that receives and reflects the fourth polarized light beam. The fourth polarized beam is incident on the second polarizing beam splitter and combined with the third polarized beam to form the output beam and is output from the second polarizing beam splitter toward the other of the transmission pupils. The transmission direction of the optical signal as described in item 6 of the patent application scope is adjustable. An optical circulator, wherein a Faraday rotator is added between the first spatial depolarization module and the second spatial depolarization module, and the Faraday rotator and the polarization rotator are defined to form a polarization modulation module. And rotating the polarization rotating element to a second predetermined angle, thereby modulating a polarization state of the first polarized light beam and a polarization state of the second polarized light beam, and outputting the third polarized light beam and the fourth polarized light beam. The optical circulator with adjustable optical signal transmission direction according to claim 7 , wherein the second preset angle is set such that the polarization state of the transmission beam is rotated by 0 degrees or 90 degrees. An optical circulator capable of adjusting an optical signal transmission direction according to claim 7, wherein the polarization rotator element is a component that causes a polarization state to rotate, and the polarization rotator element comprises a half wave plate or A twisted nematic liquid crystal cell.