JP2000338431A - Fiber type optical switch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve mass productivity and to lessen coupling loss of light by constituting the widths of a pair of grooves in such a manner that one of guide pins comes into contact with the sidewalls near the first fiber side of the grooves and a retaining plate and that the other of the guide pins comes into contact with the retaining plate alone. SOLUTION: The ends of the optical fibers are fixed to a movable fiber holding block 106 made of soft magnetic ceramics of a movable structure. The grooves 202a and b are formed at the block 106 and the guide pins 105a and b are inserted into the respective grooves 202a and b. The retaining plate 201 is joined to the surfaces on the upper side of the grooves 202a and b so as to cap the surface. The guide pins 105a and b have the cross-sectional shape smaller in the size in the depth direction of the grooves 202a and b than the depth of the grooves 202a and b. The widths of a pair of the grooves 202a and b are so constituted that one of the guide pins comes into contact with the sidewalls nearer the first fiber side of the grooves 202a and b and the retaining plate 202 and the other comes into contact with the retaining plate 202 alone.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a fiber type optical switch used in the field of optical communication.

[0002]

2. Description of the Related Art Japanese Patent Application Laid-Open No. H10 (1998) discloses a structure in which an optical switch is used to switch an optical path by using a movable yoke position of a magnetic circuit.
-268212.

In the publication, a positioning pin or a trapezoidal positioning groove is a mechanism for positioning a movable optical fiber holding member with respect to a fixed optical fiber fixing member. An actuator for moving the movable optical fiber holding member is fixed to the substrate. It is described that the actuator is composed of a coil and a permanent magnet, and displaces the movable optical fiber holding member by alternately attracting the soft magnetic member fixed to the movable optical fiber holding member.

[0004]

A structure in which a positioning pin is used for positioning using a trapezoidal groove is an excellent structure for realizing an optical switch having a small insertion loss. However, it is necessary to precisely machine all four surfaces constituting the trapezoidal groove for positioning, which has caused an increase in manufacturing cost.

In some cases, even if all four surfaces forming the positioning trapezoidal groove are machined with high precision, there is a problem that the optical fiber is displaced when switching.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to provide an optical switch which is excellent in mass productivity and has reduced optical coupling loss.

[0007]

Means for Solving the Problems The inventor of the present invention has conducted intensive studies in order to solve the above-mentioned problems, and as a result, has found a mechanism of occurrence of a positional shift of an optical fiber at the time of switching, and has reached the present invention.

For example, an object of the present invention is to provide a first block (movable fiber holding block) to which an end of a first optical fiber is fixed and a second block (fiber holding block) to which an end of a second optical fiber is fixed. In a fiber type optical switch that switches an optical path by moving the first block relatively to the second block, a block moving unit for moving the first block by magnetic force, A pair of grooves formed in the first block, a pair of guide pins one end of which is inserted into the groove and the other end of which is fixed to the second block, and the first so as to cover the groove. And a pressing plate disposed on the block, wherein the pair of grooves are formed in a direction along a longitudinal direction of the first optical fiber with the first optical fiber interposed therebetween. The guide pin is dimensioned in the depth direction of the groove has a smaller cross section than the depth of the groove, is solved by further comprising a configuration requirements below.

(1) The first block is made of a soft magnetic material, and one of the guide pins contacts a side wall of the groove close to the first fiber side and the holding plate, and the other of the guide pins The width of the pair of grooves is configured so that the contact is made only with the pressing plate.

(2): The pressing plate is a soft magnetic material,
The width of the pair of grooves is configured such that one of the guide pins contacts the side wall of the groove far from the first fiber side and the holding plate, and the other of the guide pins contacts only the holding plate. Was it.

With this configuration, the number of positioning walls and surfaces that require precision machining is minimized, and the positional deviation of the optical fiber during switching can be prevented. A positioning mechanism for aligning the optical axes of the fiber and the second fiber with high accuracy can be achieved at low cost.

[0012]

FIG. 1 is a top view showing the overall structure of an optical switch according to one embodiment of the present invention. Optical fiber 10
2 is the base 10 by the fiber holding block 103
4 is fixed. The end of the optical fiber 102 to which the input optical signal 101 is input is fixed to a movable fiber holding block 106 made of a soft magnetic ceramic having a movable structure. An end of a highly rigid guide pin 105 is slidably inserted into a groove formed in the movable fiber holding block 106. The other end of the guide pin 105 is fixed to a fiber holding block 107 made of soft magnetic ceramics. The movable area of the movable fiber holding block 106 is defined by the width of the groove by the guide pin 105.

An optical fiber 110 is fixed to the fiber holding block 107, and an output optical signal 111a or 111b is output from the optical fiber 110. The movable fiber holding block 106 is sandwiched by the yoke 109 while securing a swinging gap. A permanent magnet 112 is magnetically connected to the yoke 109, and coils 108a and 108b are wound around the yoke 109. These parts are joined to the base 104,
The base 104 is joined to or integrally formed with the package base 100.

When the movable fiber holding block 106 is on the coil 108a side as shown by a solid line, the optical fiber 102 is coupled to the first and third optical fibers 110 from the top. As a result, the input optical signal 101 is output from the optical switch as the output optical signal 111a. Movable fiber holding block 106
Is maintained at the position shown by the solid line due to the magnetic force of the permanent magnet 112 acting through the yoke 109.

Here, a coil 108 is supplied from a power source (not shown).
a, a current flows in a direction to weaken the magnetic flux in the yoke 109,
On the other hand, when an electric current is applied to the coil 108b in the direction in which the magnetic flux in the yoke 109 is strengthened, the movable fiber holding block 106 is attracted to the coil 108b and is switched to the position shown by the broken line. Once switched, the permanent magnet 1 that acts through the yoke 109 even when the current is cut off
Due to the magnetic force of 12, it is kept at the position shown by the broken line. At this time, the optical fiber 102 is coupled to the second and fourth optical fibers from the top among the optical fibers 110.
As a result, the input optical signal 101 is output from the optical switch as the output optical signal 111b.

Further, when the direction of the current is reversed again and the current flows through the coils 108a and 108b, the movable fiber holding block 106 is attracted to the coil 108a side, and is switched to the position shown by the solid line and held. As described above, in the present optical switch, the path of light can be switched by changing the direction of the current flowing through the coils 108a and 108b.

In this embodiment, the optical signal is input from the fiber holding block 103 and output from the fiber holding block 107. On the contrary, the optical signal is input from the fiber holding block 107. Even when the signal is input and output from the fiber holding block 103, the switching of the optical signal can be performed in exactly the same manner.

Next, the principle of optical switching of the optical switch will be described with reference to FIG. FIG. 2 is a cross-sectional view illustrating a cross-sectional structure of an optical switching unit (a movable fiber holding block) of the optical switch.

The guide pins 105a and 105b are
2a and 202b, the upper part of the opening of the groove is covered with a pressing plate 201, and the cross section of the guide pin movable area perpendicular to the axis of the guide pin 105 has a quadrangular shape close to a trapezoid. The movable fiber holding block 106 includes:
A force N acts in arrow directions 203 and 204.

The movable fiber holding block 106 includes:
Groove 2 sized to move guide pins 105a, 105b
02a and 202b are formed. Guide pins 105a and 105b are inserted into the respective grooves.
The movable fiber holding block 106 is a guide pin 105
a, 105b by moving left and right on the paper,
The movable fiber holding block 106 is positioned.
The optical fiber 102 is connected to the movable fiber holding block 10.
Since the movable fiber holding block 106 is fixed and held in the V-groove provided in 6, the position of the tip of the optical fiber 102 is switched.

However, in FIG. 2, for easy understanding of the operation, the position of the movable fiber holding block 106 is fixed, and the position is displayed assuming that the guide pins 105a and 105b have moved. Actually, as described above, the movable fiber block 106 moves without moving the guide pins 105a and 105b.

The switching force N acts as shown by the arrow 203, and the movable fiber holding block 106
When moving to the right side with respect to the movable fiber holding block
The positions of 5a and 105b are as shown by the solid lines. As a result, the guide pin 105a is attached to the side wall (hereinafter referred to as the outer wall) of the groove 202a on the side farther from the optical fiber 102.
The position of the guide pin 105b is determined by contacting a side wall (hereinafter referred to as an inner side wall) of the groove 202b on the side closer to the optical fiber 102.

On the contrary, when the switching force N is
In this case, the movable fiber holding block 106 moves to the left with respect to the guide pins 105a and 105b. Thereby, the guide pins 105a, 105
The position of b is as shown by the dotted line. That is, the guide pin 105a is provided on the inner wall of the groove 202a.
05b is in contact with the outer wall of the groove 202b and its position is determined.

Therefore, in order to increase the switching accuracy of the optical fiber 102, the processing accuracy of the grooves 202a and 202b of the movable fiber holding block 106 and the guide pins 105a and
It is necessary that the position accuracy of 105b is extremely high. For example, the coupling loss of light due to displacement in the translation direction is 1 dB.
In order to achieve the following, the dimensional accuracy of each surface of the grooves 202a and 202b needs to be suppressed to 2.5 μm or less.

FIG. 3 is a cross-sectional view showing a mechanism of occurrence of a displacement at the time of switching. In the figure, an arrow 301 indicates a rotation direction.

The movable fiber holding block 106 includes:
The switching force N acts as indicated by an arrow 203. The guide pins 105a and 105b are located on the left side of the movable fiber holding block 106. However, although the guide pin 105a is in contact with the inner wall of the groove 202a,
The guide pin 105b is not in contact with the inner wall of the groove 202b. Therefore, the movable fiber holding block 106
Rotational movement is possible with the center O of the guide pin 105a as a rotation axis.

Here, the switching force N acts as indicated by an arrow 203. Let h be the distance between the line of action of the switching force N and the center of the guide pin 105a. Guide pin 105
A rotation moment M = h · N acts to rotate the movable fiber holding block 106 around the center of the guide pin 105a as a rotation axis. That is, the rotational moment M acts in a direction to rotate the movable fiber holding block 106 counterclockwise on the upper side of the drawing, and the movable fiber holding block 106 rotates. However, when the guide pin 105b and the bottom surface of the groove 202b come into contact, the movable fiber holding block 106 cannot rotate any more.
Therefore, the movable fiber holding block 106 is held at the rotated position indicated by the dotted line.

With the rotation, the optical fiber 102 also moves, and deviates from a normal optical coupling position. This causes a decrease in optical coupling efficiency. That is, when the processing accuracy of the groove 202 of the movable fiber holding block 106 is poor, the movable fiber holding block 106
In addition to the translation error, the optical fiber 102 may not be accurately positioned due to a positional shift due to the rotational motion. Therefore, in order to reduce the optical coupling loss, it is necessary to process all surfaces of the grooves 202a and 202b with high precision.

FIG. 4 is a sectional view showing the dimensional relationship of the contact portion between the guide pin and the groove. Guide pin 105 and groove 20
2, only one side of FIG. 2 or FIG. 3 is shown. Also, a state is shown in which the movable fiber holding block 106 is shifted to one side.

A is a point on the side wall at a depth r from the top surface of the block (a surface on which the holding plate is provided to cover the groove 202), B is a contact point between the guide pin and the side wall, and B is a center of the guide pin. O, the radius of the guide pin is r. When a triangle ABO is formed by these three points, since the vertex B is a right angle, the following equation holds. cos θ = r / [OA] where [OA] is the length of the side OA. If the intersection of the side OA and the outer periphery of the guide pin is C, then [OA] = r + [CA]. Therefore, the following equation holds. [OA] = r + [CA] = r / cos θ Therefore, [CA] = (1 / cos θ−1) r.

Since the other side wall of the groove has an inclination of φ, the distance between the outer periphery of the guide pin and the side wall indicated by a broken line at a point of depth r from the block upper surface is given by the following equation. (1 / cos φ-1) r Next, the relationship between the switching stroke of the optical switch of the present invention and the groove dimension will be described with reference to FIG. FIG. 5 is a cross-sectional view including a movable structure fiber holding block and a guide pin, taken in a direction perpendicular to the light traveling direction.

Numeral 501 is a circle having a radius r (corresponding to the guide pin 105) whose center is located at a position r from the upper surface of the block and is in contact with the outer wall of the pressing plate 201 and the groove 202a.

The movable fiber holding block 106 includes:
Grooves 202a, 202b are formed, and guide pins 105a, 10
5b is inserted. A pressing plate 201 is joined to the upper surfaces of the grooves 202a and 202b so as to cover the grooves.

In a plane having a depth r from the block upper surface,
In the figure, the distance between the inner wall of the left groove 202a and the inner wall of the right groove 202b is a, the distance between the inner and outer walls of the left groove 202a is d1, and the distance between the inner and outer walls of the right groove 202b is d2.
And Further, the movable fiber holding block 106 is switched to the right side with respect to the guide pin, and
5b and the inner wall of the right groove 202b are in contact with each other, the distance between the outer wall of the left groove 202a and the outer periphery of the guide pin 105a is c1, the inner wall of the right groove 202b and the guide pin 10 are
The distance from the outer periphery of 5b is b2. When the movable fiber holding block 106 is switched to the left with respect to the guide pin, the guide pin 105a and the left groove 202
a with the inner wall contacting as shown by the broken line in FIG.
02a is the distance between the inner wall of the
1. The outer side wall of the right groove 202b and the guide pin 105
b The distance from the outer circumference is c2.

Now, the block has been switched to the right, and the right guide pin and the inner wall of the right groove 202b are
Assume that they are in contact as indicated by the solid line. At this time, the distance c1 between the left guide pin 105a and the outer wall of the left groove 202a is as follows. c1 = (r + b2 + a + d1)-(a + b1 + b2 + 2r
+ P) -r = d1-b1-2r-P Here, the outer wall of the left groove 202a and the guide pin 105a
Are not in contact, the movable fiber holding block 106
Is the center Q of the guide pin 105b. Therefore, a moment M ′ for rotating the movable fiber holding block 106 in the counterclockwise direction on the paper surface acts. However, the movable fiber holding block 106 cannot rotate because the positioning pin 105a already in contact with the holding plate 201 restrains this rotational movement. Thereby, the displacement of the optical fiber due to the rotational movement of the fiber holding block 106 is prevented.

That is, the fiber holding block 106
It can be understood that the condition that the positioning guide pin 105a does not contact the outer wall of the groove 202a is a condition for preventing the rotational movement of the movable fiber holding block 106 in the state in which is switched to the right.

In other words, the guide pins 105a, 10
The center-to-center distance D of 5b is constant. Therefore, for example, when the movable fiber holding block 106 is moved to the maximum in the fiber positioning direction and two states in which the guide pin 105 is positioned in contact with one side wall and the holding plate 201 are drawn in an overlapping manner, Guide pin 105
Assuming that the distance between the centers of the a and 105b is a ', the movable range of the movable fiber holding block 106 is Da'. At this time, the width Dm of the groove at the depth r from the groove side surface of the holding plate 201 (= By forming d1 and d2 so as to satisfy the relationship of Dm> Da (however, φ1 = φ2 = θ1 = θ2), the above-described effect can be obtained. That is, when one of the guide pins comes into contact with the inner wall of the groove of the movable fiber holding block and the holding plate, the other guide pin does not come into contact with the inner wall of the paired groove, but comes into contact only with the holding plate. The groove width is set.

Here, when the outer wall of the left groove 202a is in contact with the circle 501 having the radius r whose center indicated by the two-dot chain line is located r from the block upper surface, the distance between the side wall and the circle Is set to e1. If c1 is larger than e1, the left guide pin 105a does not contact the outer wall of the groove 202a. That is, c1> e1.

Therefore, d1-b1-2r-P> e1, and e1 = (1 / cos φ1-1) r, b1 =
(1 / cos θ1-1) r is substituted and rearranged to obtain the following equation. d1> 2r + P + (1 / cos θ1-1) r + (1 / cosφ1-1) r (Equation 1) Therefore, the dimensions of the block in which the groove in which the guide pin slides satisfy Expression 1. In such a case, the switching operation is performed with high accuracy.

The outer wall of the right groove 202b and the guide pin 10
Similarly, when the following equation holds for the positional relationship of 5b, the guide pin 105b does not contact the outer wall of the groove 202b, and high-precision switching is realized. Assuming that the distance between the outer wall and the circle is e2 when the outer wall of the right-side groove 202a is in contact with a circle having a radius r whose center (not shown) is located r from the upper surface of the block, c2>e2;
Therefore, d2-b2-2r-P> e2. In addition, e2
= (1 / cosφ2-1) r, b2 = (1 / cosθ2)
-1) Substituting r gives the following equation. d2> 2r + P + (1 / cos θ2-1) r + (1 / cosφ2-1) r (Equation 2) In the present embodiment, it is assumed that the block in which the groove is formed is a soft magnetic material. On the other hand, when the pressing plate is made of a soft magnetic material, the direction of the rotational moment generated by the action of the switching force is reversed. The condition for the high-precision switching in this case is given by the following equation as in the case where the block in which the groove is formed is a soft magnetic material. d1 <2r + P + (1 / cos θ1-1) r + (1 / cos φ1-1) r (Equation 3) d2 <2r + P + (1 / cos θ2-1) r + (1 / cosφ2-1) r (Equation 4) FIG. 6 shows an example of specific dimensions in the configuration of FIG.

At a position 0.125 mm from the upper surface of the movable fiber holding block 106, the width of the grooves 202a and 202b is 0.5964 mm, and the angle between the perpendicular to the upper surface of the movable fiber holding block and the inner and outer walls of the grooves 202a and 202b is 32.5 degrees, the radius r of the guide pins 105a and 105b is 0.125 mm.

When the guide pin 105a and the groove 202a are in contact with each other as shown by a broken line,
The distance from the inner wall of 2a to (1 / cos θ-1) r is 0.0232 mm by substituting θ = 32.5 degrees and r = 0.125 mm. The switching stroke is 0.250 mm. From these values, the left sides of Equations 1 and 2 are 0.5964 mm, and the right sides are 0.5464 mm. Therefore, the left side is larger than the right side and satisfies Equations 1 and 2.

With the configuration shown in FIG. 6, the grooves 202a, 2a
The processing error of the outer wall of 02b is 50 μm, and the processing error of the bottom is
Even when the optical switch is as large as 30 μm, it is possible to configure an optical switch in which the coupling loss of light due to the displacement of the optical fiber in the translation direction is 1 dB or less. Therefore, the movable fiber holding block 106
Can be easily processed, and the manufacturing cost can be reduced.

Further, in this embodiment, the grooves 202a, 20a
Although the angle of the outer wall of 2b is set to 32.5 degrees, when the angle is set to 0 degrees, a groove may be formed vertically from the upper surface of the movable fiber holding block 106. In this case, since the outer walls of the grooves 202a and 202b can be efficiently processed using a tool having a flat tip and a wide width, a further reduction in manufacturing cost can be realized.

An example of the overall configuration of the optical switch according to the present invention will be described with reference to FIG. FIG. 7 is a perspective view of a state immediately before the package of the optical switch is sealed. The figure shows a state in which the cover 706 has been removed from the package base 100.

The optical fiber 102 is fixed to a base 104 by a fiber holding block 103. The end of the optical fiber 102 is fixed to a movable fiber holding block 106 made of a soft magnetic ceramic having a movable structure. An end of a guide pin (not shown) is slidably inserted into a groove formed in the movable fiber holding block 106. The other end of the guide pin is fixed to a fiber holding block 107 made of soft magnetic ceramics. The movable fiber holding block 106 is sandwiched between the side yokes 705a and 705b while securing a swinging gap. A yoke 109 and a permanent magnet 112 are magnetically connected to the side yokes 705a and 705b, and coils 108a and 108b are
Is wound. These components are joined to the base 104, and the base 104 is joined to the package base 100. The coils 108a and 108b have a coil electrode 70
4a, 704b are provided, these are solder 703
a and 703b are electrically connected to the internal electrodes 702a and 702b. The internal electrodes 702a and 702b are electrically connected to the external electrodes 701a and 701b, respectively.

The movable fiber holding block 106 is connected to the permanent magnet 11 via side yokes 705a and 705b.
2. The coils 108a and 108b oscillate due to the magnetic force generated, thereby moving the optical fiber.
2 and the optical fiber 110 can be switched.

The groove formed in the movable fiber holding block 106 in which the guide pin slides has the structure shown in FIG. 6, and the position of the optical fiber 102 can be switched with high accuracy.

The cover 706 is joined to the package base 100 with good airtightness, a refractive index matching liquid (not shown) is injected from the refractive index matching liquid injection hole 707, and the refractive index matching liquid injection hole cover 708 is sealed with good airtightness. A switch having a light coupling loss of 1 dB or less can be easily formed by being joined on the injection hole 707.

[0050]

According to the present invention, even when there is a large processing error in the groove in which the guide pin slides, an optical switch can be constructed in which the coupling loss of light due to the displacement of the optical fiber in the translation direction is 1 dB or less, and the manufacturing cost of the optical switch can be reduced. Can be reduced.

[Brief description of the drawings]

FIG. 1 is a top view showing the entire structure of an optical switch.

FIG. 2 is a cross-sectional view illustrating a cross-sectional structure of an optical switching unit of the optical switch.

FIG. 3 is a cross-sectional view illustrating a mechanism in which a shift of a switching position occurs.

FIG. 4 is a sectional view showing a dimensional relationship of a contact portion between a guide pin and a groove.

FIG. 5 is a sectional view of a movable fiber holding block and a guide pin portion.

FIG. 5 is a view showing an example of specific dimensions.

FIG. 7 is a perspective view of a state immediately before the package of the optical switch is sealed.

[Explanation of symbols]

100: package base, 101: input optical signal, 10
2: optical fiber, 103: optical fiber holding block,
104: base, 105: guide pin, 106: movable optical fiber holding block, 107: fiber holding block, 108a, 108b: coil, 109: yoke,
110: optical fiber, 111a, 111b: output optical signal, 112: permanent magnet, 201: holding plate, 202:
Grooves, 701a, 701b ... external electrodes, 702a, 702
b: internal electrode, 703a, 703b: solder, 704
a, 704b: coil electrode; 705a, 705b: side yoke; 706: cover; 707: refractive index matching liquid injection hole; 708: refractive index matching liquid injection hole cover.

Claims (6)

[Claims] A first block to which an end of a first optical fiber is fixed and a second block to which an end of a second optical fiber is fixed are provided to face each other, and the first block is connected to the first block. In a fiber type optical switch that switches an optical path by moving relative to the second block, a block moving means for moving the first block by magnetic force, and a pair of grooves formed in the first block, A pair of guide pins, one end of which is inserted into the groove and the other end of which is fixed to the second block, and a pressing plate disposed on the first block so as to cover the groove, The first block is a soft magnetic material, the pair of grooves are formed in a direction along the longitudinal direction of the first optical fiber with the first optical fiber interposed therebetween, and the guide pin is The dimension in the depth direction is So that one of the guide pins contacts the side wall near the first fiber side of the groove and the holding plate, and the other of the guide pins contacts only the holding plate. A fiber-type optical switch, wherein the width of the pair of grooves is configured. 2. A first block to which an end of a first optical fiber is fixed and a second block to which an end of a second optical fiber is fixed are provided to face each other. In a fiber type optical switch that switches an optical path by moving relative to the second block, a block moving means for moving the first block by magnetic force, and a pair of grooves formed in the first block, A pair of guide pins, one end of which is inserted into the groove and the other end of which is fixed to the second block, and a pressing plate disposed on the first block so as to cover the groove, The pressing plate is a soft magnetic material, the pair of grooves are formed in a direction along a longitudinal direction of the first optical fiber with the first optical fiber interposed therebetween, and the guide pin is formed at a depth of the groove. Is the depth of the groove It has a smaller cross-sectional shape,
The width of the pair of grooves is configured such that one of the guide pins contacts the side wall of the groove far from the first fiber side and the holding plate, and the other of the guide pins contacts only the holding plate. A fiber-type optical switch characterized in that: 3. A fiber type optical switch according to claim 1, wherein said block moving means is an actuator having a coil and a permanent magnet. 4. The pair of grooves according to claim 1, wherein the pair of grooves has two side walls, and an angle formed between the side walls and a perpendicular to a surface of the first block on which the holding plate is disposed is: A fiber type optical switch characterized by being 90 degrees or less. 5. A fiber type optical switch according to claim 1, wherein a cross section perpendicular to the axis of said guide pin is circular. 6. A first block to which an end of a first optical fiber is fixed and a second block to which an end of a second optical fiber is fixed are provided to face each other. In the fiber type optical switch which switches an optical path by moving relative to the second block, the first block is a movable optical fiber holding block, and n (n is 2
(The above integer) number of the first optical fibers is set to 2P at the center interval.
And a pair of grooves having one bottom surface and two side walls are formed in a direction along the longitudinal direction of the first optical fiber with the first optical fiber interposed therebetween. Inserting one end of a pair of guide pins having a radius of a vertical cross section r, a holding plate is provided in the groove so as to cover the groove, the second block is an optical fiber holding block, 2 at the center interval P on the optical fiber holding block
n second optical fibers, and fixing the other end of the guide pin at the center interval D of the guide pins with the second optical fiber interposed therebetween, in a cross section perpendicular to the longitudinal axis of the groove. The depth of the groove is greater than 2r, and the side wall on the side closer to the first optical fiber is inclined by θ from a perpendicular to the surface of the first block on which the holding plate is provided, and the first light The side wall farther from the fiber is configured so as to be inclined by φ from a perpendicular to a surface on which the holding plate is provided in the first block, and r is provided from a surface on which the holding plate is provided in the first block. Is 2r + P + (1 / cosθ-1) r + (1 / cosφ−
1) A fiber type optical switch characterized by being larger than r 1.