JP2002122895A - Arbitrary wavelength light insertion and branching device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an arbitrary wavelength light insertion and branching device having a simple construction and low in cost. SOLUTION: In the device, two directional couplers 12 and 19 are coupled by a waveguide approximately constituted by waveguides 13 and 18 and a waveguide 22. Two optical multiplexer/demultiplexers 14 and 17 are inserted into the waveguides 13 and 18 side. Phase controllers 16, 16... are inserted into respective plural waveguides 15, 15... provided between the multiplexer/ demultiplexers 14 and 17. An optical path length/loss adjusting means 23 is provided in the waveguide 22.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an arbitrary wavelength optical add / drop device used as a component for multiplexing and demultiplexing light of an arbitrary wavelength in a wavelength division multiplexing optical communication system.

[0002]

2. Description of the Related Art FIG. 5 is a block diagram of a conventional arbitrary-wavelength light insertion / branching device. The main light is split by the optical multiplexer / demultiplexer 2 for each wavelength, and light of each wavelength is emitted from each of the plurality of waveguides 3, 3,. Each of the waveguides 3, 3,... Is provided with one 2 × 2 optical switch (an optical switch having two input and output ports) 4, 4,. The 2 × 2 optical switch 4 is provided with an input port 5 and an output port 6, and guides the light propagating through the waveguide 3 to the optical multiplexer / demultiplexer 7 or emits the light from the output port 6 to form a split light (Drop light). ) And can be switched. Further, the insertion light (Add light) is incident from the incident port 5, guided to the optical multiplexer / demultiplexer 7, and multiplexed with the main light distributed to the waveguide 3.

Therefore, A (λ) is used as the main light.
1), A (λ2),..., A (λm),..., A (λn) are input from the first port 1 and A (λ
When the light of the Add light B (λm) is incident from the input port 5 of the optical switch 4 provided in the waveguide 3 to which m) is distributed, the A (λm) is output from the output port 6 as Drop light. After switching, A (λm) and B (λm) are switched through the optical switch 4. The light of each wavelength passing through each of the waveguides 3, 3,... And the optical switches 4, 4,... Is multiplexed by the second optical multiplexer / demultiplexer 7, and A (λ1), A ( λ2), ..., B
(Λm),..., A (λn).
The light to be added / dropped (inserted / branched) can be freely selected by switching the optical switches 4, 4,....

[0004]

However, the conventional arbitrary-wavelength light insertion / branching device has the following problems. (1) The 2 × 2 optical switch has a complicated structure and is expensive. (2) Many ports for Add light and Drop light are required. (3) The 2x2 optical switch and the optical multiplexer / demultiplexer are obtained by doping a cladding layer made of, for example, silica-based glass formed on a silicon substrate with a dopant such as germanium, which increases the refractive index, along the waveguide pattern. Can be formed. However, the product yield of the 2 × 2 optical switch and the optical multiplexer / demultiplexer is low, and when they are manufactured on the same substrate, the productivity is significantly reduced. Therefore, miniaturization is difficult. The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a low-cost arbitrary-wavelength light insertion / branching device with a simple structure. It is another object of the present invention to reduce the size of an arbitrary wavelength light insertion / branching device.

[0005]

In order to solve the above-mentioned problems, an arbitrary wavelength light insertion / branching device according to the present invention comprises two directional couplers coupled by two waveguides. Two optical multiplexers / demultiplexers are inserted into one of the waveguides, and a phase controller is inserted into each of a plurality of waveguides provided between the two optical multiplexers / demultiplexers. In addition to the above, an optical path length adjusting means and a loss adjusting means are provided so that an optical path length and a loss are equal to one of the waveguides. The optical path length adjusting means adjusts the optical path length by adjusting the length of the waveguide, and the loss adjusting means causes a connection loss in the middle of the waveguide, and the loss is determined by the magnitude of the loss. Is preferably adjusted. Further, in the optional arbitrary wavelength light insertion / branching device according to the present invention, the light incident on the first directional coupler is divided into a first group and a second group from the first directional coupler and emitted. And wherein the first group and the second group are
An optical multiplexer / demultiplexer, a plurality of waveguides provided on the output side of the optical multiplexer / demultiplexer, and a second directional coupler passing through the optical multiplexer / demultiplexer provided on the output side of the waveguide; An arbitrary-wavelength light insertion / branching device formed so as to be incident so that an optical path length and a loss of the first group and the second group are equal to each other. A phase controller is inserted into half of the plurality of waveguides provided between the optical multiplexer / demultiplexers through which the two groups pass. In these arbitrary wavelength light insertion / branching devices, a Mach-Zehnder type interference system is formed between two directional couplers, so that light with arbitrary wavelengths can be inserted and dropped with a simple configuration. In these arbitrary wavelength light insertion / branching devices, it is preferable to use a phase controller utilizing a thermo-optic effect. Further, these arbitrary wavelength light insertion / branching devices can be formed on one substrate, and miniaturization can be achieved.

[0006]

FIG. 1 shows an example of a conceptual diagram of an arbitrary wavelength light insertion / branching device according to the present invention. The directional coupler 12 has two input ports (a first light input port for main light input).
A port 11, a second port 21 for Add light incidence) and two waveguides 13 and 22 for emission are provided. One of the waveguides 13 is connected to an optical multiplexer / demultiplexer 14. The optical multiplexer / demultiplexer 14 has a plurality of waveguides 15, 15,... Between the optical multiplexer / demultiplexer 14 and another optical multiplexer / demultiplexer 17. In addition,
A phase controller 16, 16,... Is inserted in the middle of each of the waveguides 15, 15,.
Are controlled independently of each other.

Further, the optical multiplexer / demultiplexer 17 has an output 1
The other end of the waveguide 18 is connected to a second directional coupler 19. The directional coupler 19 includes a third port 20 for emitting main light,
And a fourth port 25 for emitting light.

On the other hand, another output waveguide 22 of the directional coupler 12 is connected to the directional coupler 19. The waveguide 22 is provided with an optical path length / loss adjusting means (optical path length adjusting means and loss adjusting means) 23. The optical path length / loss adjusting means 23 is a directional coupler 1
From the directional coupler 12 to the directional coupler 19, through the waveguide 18 to the directional coupler 19, and from the directional coupler 12 to the waveguide 22, Is inserted to adjust the optical path length and the loss up to the point to be equal.

That is, the optical multiplexer / demultiplexer 1 is provided on the waveguide 13 side.
4 and 17 are inserted and the waveguides 15, 15... And the phase controllers 16, 16.
The optical path length becomes longer than that on the second side, and the loss increases. Therefore, on the waveguide 22 side, by intentionally setting a long optical path length or applying a means for giving a loss,
It is assumed that the characteristics of the waveguide 13 and the waveguide 22 are equal. As a result, unless the phase is controlled by the phase controller 16 as described later, the light incident from the first port 11 exits from the third port 20 and the light incident from the second port 21 Is obtained.

In other words, in this arbitrary-wavelength optical add / drop device, the two directional couplers 12 and 19 are:
One optical waveguide roughly constituted by the waveguides 13 and 18 is coupled to another optical waveguide 22, and two optical multiplexers / demultiplexers 14 and 17 are inserted into the waveguides 13 and 18, respectively. Each of the plurality of waveguides 15, 15,... Provided between these optical multiplexers / demultiplexers 14, 17 is provided with a phase controller 1.
6, 16,... Are inserted. The other waveguide 22 is provided with an optical path length / loss adjusting means 23.

The directional couplers 12 and 19 divide the light incident from one of the two incident ports approximately equally and emit the light from the two exit ports.
For example, a 3 dB directional coupler is used. As the 3 dB directional coupler, a substrate type including a waveguide formed on a substrate, a fusion-stretching type using an optical fiber, and the like can be used depending on the form of the arbitrary wavelength light insertion / branching device.
The optical multiplexers / demultiplexers 14 and 17 may be, for example, an AWG (arrayed waveguide grating type optical multiplexer / demultiplexer).

As the phase controllers 16, 16,..., A method of changing the refractive index and the length of the waveguide by using a conventionally used electro-optic effect, stress-optic effect, thermo-optic effect or the like is exemplified. be able to. For example, a linear heater whose heating temperature can be controlled is provided along the length direction of the waveguides 15, 15,... To heat the waveguides 15, 15,. Can be changed to perform phase control. For example, if the length of the waveguides 15, 15,... In the range heated by the heater is 10 mm, the change in temperature required to change the phase by π is 5.7 ° C.

As will be described later, normally only one of the waveguides 15, 15,... Controls the phase. Therefore, when the heater is heated, the waveguide 15 to be heated is
It is preferable that the waveguides 15, 15,... Are installed with a certain distance therebetween so as not to change the temperature of the other waveguides 15, 15,. When the other waveguides 15, 15,... Are heated and the wavelength of the light is not expected, Add / Drop is performed.
(Insertion, branching) occurs. For example, when one waveguide 15 is provided with one heater, the waveguide 15
When the width of the heater is about 7 μm and the width of the heater is about 20 μm, it is preferable that the distance between the adjacent waveguides 15 is 200 μm or more. Further, a Peltier element can be used instead of the heater. The Peltier element is an element utilizing the Peltier effect, which can apply an electric field to thermoelectrons to move them, thereby increasing the temperature of one of the opposing surfaces of the rectangular parallelepiped and decreasing the temperature of the other. Therefore, a rectangular parallelepiped Peltier element is provided along the length direction of the waveguide 15, and the waveguide 15
The waveguide 15 can be heated by increasing the temperature of the side surface. The phase controller 16 utilizing these thermo-optic effects is suitable from the viewpoint of manufacturability and the like when the arbitrary wavelength light insertion / branching device is formed on one substrate as described later.

As a specific example not using the thermo-optic effect, for example, light is emitted into space in the middle of the waveguide 15, reflected by a movable mirror or the like, and returned to the waveguide 15 again.
A method of adjusting the optical path length and controlling the phase can also be adopted.

As the optical path length / loss adjusting means 23, for example, instead of inserting a specific element, as shown in FIG.
A, the optical path length of light propagating between the directional couplers 12 and 19 on the waveguide 22 side is changed by the directional coupler 1 on the waveguide 13 side.
The waveguide 22 is designed so as to be equal to that between the two, and the middle of the waveguide 22 is divided and separated, and light is guided from one end face to the opposite end face while generating a predetermined connection loss. By forming the discontinuous portions 23B arranged as described above, it is possible to exemplify means for making the loss equal to that of the waveguide 13 side. The magnitude of the connection loss can be adjusted by the distance between the end faces of the divided waveguides 22 and the like. In this example, an arrayed waveguide grating type optical multiplexer / demultiplexer 14 is used as an optical multiplexer / demultiplexer.
A, 17A, and arrayed waveguide
In the grating type optical multiplexer / demultiplexers 14A and 17A, a plurality of arrayed waveguides are arranged in an inverted U-shape, so that the curved portions 23A and 23A are U-shaped corresponding to the inverted U-shaped portion. ing.

The operation of the arbitrary wavelength light add / drop device will be described below with reference to FIG. First, the first
A (λ1), A (λ2) as main light to port 11
, A (λm),..., A (λn) are incident, and B (λm) is incident on the second port 21 as Add light. The main light and the Add light are substantially equally distributed to the waveguides 13 and 22 by the directional coupler 12. The main light and the Add light that have propagated through the waveguide 13 reach the optical multiplexer / demultiplexer 14, and are respectively supplied to the waveguides 15, 15,.
.., Λn for each wavelength (λ1, λ2,..., Λm,. Here, in the waveguide 15 to which λm is distributed,
Both the main light A (λm) and the add light B (λm) are guided. By operating only the phase controller 16 provided in the waveguide 15, A (λm) and B (λm)
Is shifted by π from the normal time (when insertion / branching is not performed).

The light transmitted through each of the waveguides 15 is multiplexed by the optical multiplexer / demultiplexer 17 and enters the waveguide 18. Next, the main light A (λ1), A
(Λ2),..., A (λm),..., A (λn) and Ad
d light B (λm) and main light A (λ1), A (λ2),..., A (λm),.
When (λn) and the add light B (λm) interfere with each other, A (λm) of the main light is replaced with the Add light B (λm) from the third port 20 by the phase adjustment.
(Λ1), A (λ2),..., B (λm),.
n) is output from the fourth port 25
Drop light A (λm) replaced with dd light B (λm)
Is emitted. That is, by forming a so-called Mach-Zehnder interference system between the directional couplers 12 and 19, Add / Drop (insertion and branching) can be performed.

As described above, in this arbitrary wavelength light insertion / branching device, one port for inputting the main light (the first port 11) and one port for inputting the Add light (the second port 21) are provided one by one. And the structure becomes simpler than the conventional one.

Further, the directional couplers 12, 19 and the optical multiplexers / demultiplexers 14, 17 can be manufactured by the same operation as that for manufacturing a substrate type waveguide. Specifically, for example, by a flame hydrolysis deposition method (FHD method) on a silicon substrate,
A lower cladding layer made of quartz glass is formed. Then, a dopant having a function of increasing the refractive index, such as germanium, is doped on the upper surface of the lower cladding layer along a pattern such as a waveguide constituting an arbitrary wavelength light insertion / branching device. Further, an upper clad layer is formed thereon by a flame hydrolysis deposition method (FHD method) or the like, and a clad layer integrated with the lower clad layer is formed. Since the waveguide guides light, a cladding layer having a lower refractive index than the waveguide is provided around the waveguide.

When, for example, a heater is used as the phase controller 16, it can be easily formed integrally with the substrate type waveguide. Specifically, for example, a conductor thin film made of titanium, gold, aluminum or the like is formed on the cladding layer, and processed by an etching method or the like to form a heater. When a Peltier element is used as the phase controller 16, a Peltier element having a predetermined shape is arranged on the cladding layer.

As described above, in this arbitrary wavelength optical add / drop device, the first port 11 and the second port 21
To the third port 20 and the fourth port 25 can be easily formed on the same substrate, and the size can be reduced. Also, the manufacturing operation is simple. Furthermore, since a complicated and high-value device such as a conventional arbitrary wavelength light insertion / branching device is not used, the cost is low.

Further, as shown in FIG. 3, the waveguide 13 side and the waveguide 22 side between the directional couplers 12 and 19 may have substantially the same configuration. That is, in this example,
Between the directional coupler (first directional coupler) 12 and the directional coupler (second directional coupler) 19, an arrayed
Waveguide grating type optical multiplexer / demultiplexer 14B,
17B is provided. Arrayed Waveguide
In the grating type optical multiplexer / demultiplexer 14B, the inverted U-shaped arrayed waveguides 14a, 14a protruding toward the waveguide 13 side.
a are arranged in parallel, and this arrayed waveguide 1
4a, 14a... And the same number of arrayed waveguides 14b,
Are arranged symmetrically on the waveguide 22 side. Slab waveguides 14c and 14d are provided at both ends of the arrayed waveguides 14a, 14a and the arrayed waveguides 14b, 14b, respectively. That is, the array waveguides 14a, 14a,.
4b are connected integrally to the slab waveguide 14c, and the other ends are connected integrally to the slab waveguide 14d. In the arrayed waveguide grating type optical multiplexer / demultiplexer 14B, the arrayed waveguides 14a, 14a,.
c and 14d form one optical multiplexer / demultiplexer, and the arrayed waveguides 14b, 14b,.
4d forms another optical multiplexer / demultiplexer, and has a structure in which two optical multiplexers / demultiplexers are integrated. .. And the number of array waveguides 14b, 14b,... Should be appropriately designed according to the characteristics of the optical multiplexer / demultiplexer required for the circuit configuration.

The arrayed waveguide grating type optical multiplexer / demultiplexer 17B is the same as the arrayed waveguide grating type optical multiplexer / demultiplexer 14B, and includes arrayed waveguides 17a, 17a,.
Array waveguides 17a, 17 paired with 7a, 17a.
are arranged symmetrically, and the slab waveguides 1 are provided at both ends of the arrayed waveguides 17a, 17a, and 17b, 17b,.
7c and 17d are provided. .. And the slab waveguide 17.
c, 17d, and the arrayed waveguides 17b, 17b... and the slab waveguides 17c, 17d have a structure in which two optical multiplexers / demultiplexers are substantially integrated. A plurality of waveguides 15, 15,... Are provided between the arrayed waveguide grating type optical multiplexer / demultiplexers 14B, 17B.
, And the same number of waveguides 15 ′, 15 ′, which form a pair with these waveguides 15, 15, are provided symmetrically. Waveguide 1
The phase controllers 16, 16,... Are inserted in the respective 5, 15,.

Two waveguides 18 and 18 'of the same length are connected to the output side of the arrayed waveguide grating type optical multiplexer / demultiplexer 17B, and these waveguides 18 and 18' are directional. It is connected to the input side of the coupler 19. With this configuration, unless the phase is controlled by the phase controller 16, light incident from the first port 11 exits from the third port 20, and light incident from the second port 21 exits from the fourth port 25. The emission characteristic is obtained.

The operation of the arbitrary wavelength light add / drop device is as follows. First, A (λ1), A (λ2),..., A (λm),.
The combined light of (λn) is made incident, and B (λm) is made incident from the second port 21 as Add light. The main light and the Add light are respectively transmitted to the waveguide 13 by the directional coupler 12.
(The first group) and the waveguide 22 (the second group).

The main light and the Add light (first group) transmitted through the waveguide 13 pass through the array waveguides 14b, 14b,... Via the slab waveguide 14c. At this time, since the optical path length difference is provided between the arrayed waveguides 14b, 14b..., The light transmitted through the respective waveguides 14b, 14b. , And Add light are distributed to the waveguides 15, 15,... For each wavelength (λ1, λ2,..., Λm,. Similarly, the main light and the Add light (second group) propagated through the waveguide 22 are also transmitted through the slab waveguide 14c to the arrayed waveguide 14
a, 14a..., and through the next slab waveguide 14d, into the waveguides 15 ′, 15 ′... at each wavelength (λ1, λ2,.
m,..., λn).

Here, in the waveguide 15 to which λm is distributed, the main light A (λm) and the add light B (λ
m) are both guided. Then, only the phase controller 16 provided in the waveguide 15 is operated to shift the phase of A (λm) and the phase of B (λm) by π from the normal time (when no insertion / branching is performed).

Next, the main light beams A (λ1), A (λ2),..., A (λm) guided through the waveguides 15, 15,.
.., A (λn) and Add light B (λm) (first group)
Are arrayed through the slab waveguide 17c,
7b, are multiplexed via the next slab waveguide 17d, pass through the waveguide 18, and enter the directional coupler 19. On the other hand, the main lights A (λ1), A (λ2),..., A (λm),.
(Λn) and the add light B (λm) (second group) pass through the slab waveguide 17c and are arrayed by the array waveguides 17a, 17a,.
, And are multiplexed through the next slab waveguide 17 d, transmitted through the waveguide 18 ′, and incident on the directional coupler 19. Then, the light of the first group and the light of the second group are combined by the directional coupler 1.
9, interference of the main light A (λm) from the third port 20 causes the Add light B (λ
A (λ1), A (λ2), ..., B replaced with m)
A combined light composed of (λm),..., A (λn) is emitted, and a drop light A (λm) which is replaced with the Add light B (λm) is emitted from the fourth port 25.

In this arbitrary wavelength light insertion / branching device, the waveguide 13 side and the waveguide 22 side have substantially the same configuration, so that the waveguide 13 side is located between the directional coupler 12 and the directional coupler 19. Group and waveguide 22 distributed to
The optical path length and the loss of the second group distributed to the side can be made substantially equal. Therefore, the adjustment of the optical path length and the loss can be performed more easily than the configurations shown in FIGS. The waveguides 15 ′, 15 ′ are different from the waveguides 15, 15,.
It is preferable that the optical path length and the loss caused by the insertion of the phase controllers 16, 16,. In this example, the phase controllers 16, 16,... Are inserted on the side of the waveguides 15, 15,... Through which the first group transmits, but the present invention is not limited to this. That is, the main lights A (λ1), A (λ2),..., A constituting the first group and the second group, respectively.
(Λm),..., A (λn) and Add light B (λm), for example, for A (λm) and B (λm), the first group A (λm) and B (λm) The phase controller 16 is provided in one of the waveguide 15 and the waveguide 15 ′ through which the second group A (λm) and B (λm) are transmitted.
Should just be inserted. The same applies to the waveguides 15 and 15 'through which light of other wavelengths is guided, and the waveguides 15 and 1 through which the light divided into the first group and the second group are transmitted.
It is sufficient that one phase controller 16 is inserted for each wavelength into any one of 5 ′.

For example, a configuration as shown in FIG. 4 can be adopted. In this example, in the directional coupler 12, the first group distributed to the waveguide 13 side is the optical multiplexer / demultiplexer 1
Are transmitted to the waveguides 15, 15,... For each wavelength, further transmitted through the optical multiplexer / demultiplexer 17C, multiplexed, and then enter the directional coupler 19 from the waveguide 18. On the other hand, in the directional coupler 12, the second group distributed to the waveguide 22 side is distributed from the optical multiplexer / demultiplexer 14D to the waveguides 15 ', 15'. And enters the directional coupler 19 from the waveguide 18 ′. The waveguides 15, 15... And the waveguides 15 ′, 15 ′... Have, for each wavelength, a phase in one of the waveguide 15 transmitting the first group and the waveguide 15 ′ transmitting the second group. Controller 16, 1
6 are inserted. Thus, in the configuration shown in FIG. 3, the optical multiplexer / demultiplexer through which the first group and the second group pass is provided separately so that the optical paths of the first group and the second group do not intersect. , And a phase controller 1 is provided in both a part of the waveguides 15, 15... And a part of the waveguides 15 ′, 15 ′.
6, 16 ... can also be inserted.

In the example shown in FIG. 3 and the like, the wavelength division performance of the optical multiplexer / demultiplexer is high.
Although a waveguide grating type optical multiplexer / demultiplexer is used, there is no particular limitation as long as it has a characteristic of separating light of a plurality of wavelengths for each wavelength. The size of each component of the arbitrary wavelength light insertion / branching device is not particularly limited, and is appropriately adjusted according to the wavelength of light to be propagated, inserted, or branched. Even when integrally formed on the silicon substrate, the thickness of the silicon substrate is not particularly limited, and the thickness of the cladding layer can be appropriately adjusted according to the size of the waveguide.

[0032]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An arbitrary-wavelength optical add / drop device having the configuration shown in FIG.
1551.72, 1555.22, 1553.33 nm
When an experiment was performed using the combined light of the above light as main light and the light having a wavelength of 1552.52 nm as Add light, the light having a wavelength of 1552.52 nm of the main light was emitted as Drop light, and the Add light and the remaining main light were emitted. Light multiplexed with the light could be emitted. Therefore, it has been clarified that characteristics as an arbitrary wavelength light insertion / branching device can be realized.

[0033]

As described above, in the arbitrary wavelength light insertion / branching device of the present invention, only one port for inputting the main light and one port for inputting the Add light are required. It has a simple structure in comparison.
Furthermore, it can be easily formed on the same substrate, and the size can be reduced. Also, the manufacturing operation is simple. Furthermore, since a complicated and high-value device such as a conventional arbitrary wavelength light insertion / branching device is not used, the cost is low.

[Brief description of the drawings]

FIG. 1 is a conceptual diagram of an example of an arbitrary-wavelength optical add / drop device of the present invention.

FIG. 2 is a schematic configuration diagram showing an embodiment of an arbitrary-wavelength optical add / drop device of the present invention.

FIG. 3 is a schematic configuration diagram showing another embodiment of the arbitrary-wavelength optical add / drop device of the present invention.

FIG. 4 is a schematic configuration diagram showing another embodiment of an arbitrary-wavelength optical add / drop device of the present invention.

FIG. 5 is a conceptual diagram showing an example of a conventional arbitrary wavelength light insertion / branching device.

[Explanation of symbols]

12 ... directional coupler (first directional coupler), 19 ... directional coupler (second directional coupler), 14, 14C, 1
4D, 17, 17C, 17D ... optical multiplexer / demultiplexer, 14A, 1
4B, 17A, 17B: arrayed waveguide grating type optical multiplexer / demultiplexer, 15, 15 ': waveguide, 1
6: phase controller, 23: optical path length / loss adjusting means (optical path length adjusting means, loss adjusting means).

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H04B 9/00 U (72) Inventor Koji Ohura 1440 Mutsuzaki, Sakura City, Chiba Prefecture Fujikura Sakura Works ( 72) Inventor Yoshihiro Momitsu 1440, Rokkazaki, Sakura City, Chiba Prefecture Inside Fujikura Sakura Works, Inc. KA03 KB04 LA11 LA18 NA01 TA01 TA43 2H079 AA06 AA12 BA01 BA03 CA07 EA04 EA05 EB27 GA03 HA07 2K002 AA02 AB05 AB34 BA13 DA07 DA08 DA10 EA14 EA16 HA11 5K002 BA05 CA02

Claims (5)

[Claims] 1. Two directional couplers are coupled by two waveguides, and two optical multiplexers / demultiplexers are inserted into one of the two waveguides, and the two optical multiplexers / demultiplexers are provided. A phase controller is inserted into each of a plurality of waveguides provided between the optical waveguides, and an optical path length adjusting means is provided in the other of the two waveguides so that an optical path length and a loss are equal to one of the waveguides. And an arbitrary wavelength light insertion / branching device characterized by being provided with a loss adjusting means. 2. The arbitrary wavelength light inserting / branching device according to claim 1, wherein the optical path length adjusting means adjusts the optical path length by adjusting the length of the waveguide, and the loss adjusting means comprises a light guide. An arbitrary-wavelength light insertion / branching device, wherein a connection loss is generated in the middle of a wave path, and the loss is adjusted according to the magnitude of the loss. 3. The light incident on the first directional coupler is emitted from the first directional coupler into a first group and a second group, and the first group and the second group are separated from each other. The two groups respectively pass through the optical multiplexer / demultiplexer, the plurality of waveguides provided on the output side of the optical multiplexer / demultiplexer, and the optical multiplexer / demultiplexer provided on the output side of the waveguide. An arbitrary-wavelength light insertion / branching device formed so that the first group and the second group have the same optical path length and loss by being configured to be incident on the two directional couplers. An arbitrary wavelength light insertion / branching device, wherein a phase controller is inserted in each half of a plurality of waveguides provided between optical multiplexers / demultiplexers transmitted by the first group and the second group. . 4. The arbitrary wavelength light insertion / branching device according to claim 1, wherein the phase controller utilizes a thermo-optic effect. 5. The arbitrary wavelength light insertion / branching device according to claim 1, wherein the device is formed on a single substrate.