JP2000036632A - Optical amplifier - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable an optical amplifier provided with optical fibers for amplification which directly amplify signal light based on stimulated emission effects and optical parts, such as the multiplexer, photodetector, etc., to sufficiently meet a request to reduce the size of the amplifier by orderly arranging the optical fibers and various optical parts at high density. SOLUTION: An optical amplifier has shallow trays 10 and 12 in which optical fibers and optical parts 4a, 4b, 6a,... are arranged and slits 10c, 10e,..., and 12c 12e,... for controlling the positions of the optical parts 4a, 4b, 6a,... are formed through prescribed spots of bottom plates 10a and 12a of the trays 10 and 12. At a plurality of spots in the peripheral sections of the bottom plates 10a and 12a of the trays 10 and 12, in addition, folded section 10h and 12h for bundling optical fiber are formed in such a way that the sections 10h and 12h are folded toward insides the trays 10h and 12h.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical amplifier using an amplifying optical fiber for directly amplifying signal light based on stimulated emission effect as an amplifying element. And technology for storing and arranging optical components at high density.

[0002]

2. Description of the Related Art Conventionally, as an optical amplifier used in an optical communication system or the like, an optical fiber doped with a rare earth element such as Er or Nd is provided as an amplifying element, and a signal light is generated based on the stimulated emission effect of the optical fiber. Are directly amplified.

FIG. 19 is a block diagram showing an example of such an optical amplifier.

The optical amplifier 1 is of a so-called bidirectional pump type, in which pump light is introduced together before and after an optical fiber 2 as an amplifying element. In FIG. 1, reference numeral 1 denotes the entire optical amplifier. Reference numeral 2 denotes an optical fiber as an amplifying element, which is formed by doping the core or the outer periphery of the core with a rare earth element such as Er or Nd. 3a and 3b are optical fibers 2 for amplification.
Light sources 4a and 4b, which are laser diodes for generating pumping light for pumping light, are multiplexers for introducing pumping light from the pumping light sources 3a and 3b into the amplification optical fiber 2,
Reference numerals 5a and 5b denote isolators for preventing unnecessary end face reflection and allowing light to pass only in one direction. 6a, 6b
Is a light receiving element such as a photodiode for monitoring the signal light before and after the amplification, and 7a and 7b are branching devices for branching a part of the signal light to the light receiving elements 6a and 6b.

Reference numeral 8 denotes an optical fiber 2 for amplification and an optical fiber for intermediate connection for connecting the optical components 4a, 4b, 5a, 5b, 6a, 6b, 7a, 7b,. Denotes a fusion spliced portion of each of the optical fibers 2 and 8.

In the optical amplifier 1 having this configuration, each pump light source 3
Excitation light having a wavelength of, for example, 1.48 μm is generated from a and 3b, and is introduced into the amplification optical fiber 2 through the multiplexers 4a and 4b to pump the amplification optical fiber 2.

On the other hand, for example, a signal light having a wavelength of 1.55 μm is incident on the amplifying optical fiber 2 through the splitter 7a, the isolator 5a, and the multiplexer 4a in this order, and this signal light is generated by the stimulated emission effect. Amplified directly. Then, the amplified signal light is output through the multiplexer 4b, the isolator 5b, and the splitter 7b in this order.

[0008]

In recent years, due to the demand for downsizing of the device, each of the optical fibers 2 and 8 constituting the optical amplifier and various optical components 4a, 4b, 5a and 5 have been developed.
., 6a, 6b, 7a, 7b,...

In this case, the optical fibers 2 and 8 constituting the optical amplifier and various optical components 4a, 4b, 5a, 5b, 6a, 6
If the b, 7a, 7b,... are simply packed in the case, the arrangement will be messy, and not only will the assemblability be poor, but also the extra length processing of the optical fibers 2, 8 and the respective optical components 4a, 4a
It is very difficult to determine the fixed order of b, 5a, 5b, 6a, 6b, 7a, 7b,...

Furthermore, when manufacturing a module in which not only one optical amplifier but also a plurality of optical amplifiers are housed in one case, the assembly becomes complicated because each system is complicated. It becomes even worse, and when the device breaks down, it takes a lot of trouble and time to find the faulty part and to assemble the device after repair.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an optical fiber and various optical components constituting an optical amplifier can be arranged at high density and in an orderly manner. It is an object of the present invention to be able to sufficiently meet the demand for miniaturization without causing any problem.

[0012]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides an amplifying optical fiber for directly amplifying a signal light based on a stimulated emission effect, and an optical fiber such as a multiplexer or a light receiving element. The following configuration is adopted in the optical amplifier including the components.

That is, according to the first aspect of the present invention, there is provided a thin tray on which optical fibers and optical components are arranged, and a slit for regulating the position of the optical components is formed at a predetermined position on the bottom plate of the tray. Further, at a plurality of locations around the bottom plate of the tray, bent portions for binding optical fibers are formed by folding back toward the inside of the tray.

Thus, the optical fibers and various optical components constituting the optical amplifier can be arranged densely and orderly.

Further, according to the invention described in claim 2, according to claim 1,
In the configuration described above, an outlet for electrically extracting the optical component to the outside of the tray is formed at a substantially central portion of the bottom plate of the tray.

Thus, the optical components can be electrically connected to the outside without obstructing the arrangement of the optical fibers and optical components already arranged on the tray.

According to a third aspect of the present invention, in the configuration of the first aspect, instead of providing a slit on the bottom plate of the tray, a wiring board is placed on the bottom plate of the tray, and a slit is formed in the wiring board. Further, a connection portion for electrically pulling the optical component out of the tray via a wiring pattern is formed at a substantially central portion of the wiring board.

Thus, it is possible to eliminate the inconvenience that the lead wire of the optical component crosses the optical fiber.

According to a fourth aspect of the present invention, in the optical amplifier according to any one of the first to third aspects, a plurality of trays on which the optical fibers and optical components are arranged are sequentially stacked. It is housed in a single case in a closed state.

As a result, since a plurality of optical amplifiers are systematically arranged for each system, the assemblability is good, and it is possible to easily find and repair a faulty portion of the device.

[0021]

Embodiments of the present invention will be described below with reference to the drawings.

Embodiment 1 In Embodiment 1, a case will be described as an example where two systems of the bidirectional pumping type optical amplifier shown in FIG. 19 are configured as modules.

In the first embodiment, two types of thin trays, a lower tray 10 and an upper tray 12, are provided. Each of the trays 10 and 12 has an optical fiber as a constituent element for each system of the optical amplifier. 2, 8 and various optical components 4a, 4b, 5
a, 5b, 6a, 6b, 7a, 7b,... are arranged, and in this state, the trays 10, 12 are sequentially stacked. Although the trays 10 and 12 are formed by processing a stainless steel plate in this example, metals such as copper and phosphor bronze, plastics, and the like can be used.

FIG. 1 is a plan view of the lower tray 10, FIG. 2 is a sectional view taken along line AA of FIG. 1, and FIG. 3 is a sectional view taken along line BB of FIG.

The lower tray 10 is thin and has a height of about 3 to 5 mm, and has a bottom plate 10a which is substantially rectangular in plan view. The four corners of the bottom plate 10a are cut out to form cutout portions 10b. At a substantially central portion of the bottom plate 1a, an outlet 10f for electrically outputting the output of an optical component (particularly, the light receiving elements 6a and 6b in this case) to the outside of the tray 10 is formed. Further, slits 10c, 10d, 10e for regulating the positions of the optical components 5a, 5b, 6a, 6b,... Are formed at symmetrical positions vertically sandwiching the outlet 10f of the bottom plate 10a.

On the other hand, the bent portion 1 is provided on the peripheral wall portion rising from the upper, lower, left and right sides of the bottom plate 10a of the tray 10.
0 g and 10 h are folded back toward the inside of the tray. These bent portions 10g and 10h are connected to the optical fibers 2 and 8 respectively.
Of the tray 1
It also acts as a support when stacking 0,12. Then, an optical fiber 8 for intermediate connection for connecting the multiplexers 4a, 4b and the excitation light sources 3a, 3b is drawn out of the tray 10 from the peripheral wall portion adjacent to the bent portion 10g on one side (right side). For this purpose, a pair of U-shaped cutouts 10i are provided.

Of the slits 10c, 10d, and 10e, the slit 1 at the position farthest from the outlet 10f.
0c is for arranging the fusion splicing portion 9 and its inner slit 10d
Is for disposing the isolators 5a and 5b, and these slits 10c and 10d are extended along respective upper and lower sides of the bottom plate 10a. The four slits 10e located closest to the outlet 10f are provided with the light receiving elements 6a,
6b is relatively short.

FIG. 4 is a plan view of the upper tray 12, FIG. 5 is a sectional view taken along line CC of FIG. 4, and FIG. 6 is a sectional view taken along line DD of FIG.

The upper tray 12 is stacked on the lower tray 10 and has a shape substantially similar to that of the lower tray 10.

That is, the upper tray 12 has a height of 3
It has a thin, approximately rectangular bottom plate 12a of about 5 mm, with cutouts 12b at four corners of the bottom plate 12a, and a tray for electrically outputting the outputs of the light receiving elements 6a, 6b at a substantially central portion. 12 are formed respectively, and slits 12c, 12d for regulating the positions of the optical components 5a, 5b, 6a, 6b,... Are formed at symmetrical positions vertically sandwiching the outlet 12f of the bottom plate 12a. 12e and 12j are formed. Further, bent portions 12g and 12h are formed to be folded back toward the inside of the tray at portions of the peripheral wall rising from the upper, lower, left and right sides of the bottom plate 20a, and are formed at portions of the peripheral wall adjacent to the bent portion 12g on one side. Is provided with a pair of U-shaped cutouts 12 i for drawing out the optical fiber 8 for intermediate connection to the outside of the tray 12.

The above slits 12c, 12d, 12e, 1
2j, the slit 12c farthest from the outlet 12f is for disposing the fusion splicing portion 9, and the slit 12d inside thereof is for disposing the isolators 5a and 5b. These slits 12c and 12d are It extends along each of the upper and lower sides of the bottom plate 12a. The upper slit 12e of the pair of upper and lower slits 12e and 12j, which are located relatively close to the outlet 12f and is relatively thick and long, has the upper tray 12 stacked on the lower tray 10. Sometimes, the light receiving elements 6a and 6b arranged on the lower tray 10 abruptly hit the bottom plate 12a of the upper tray 12 and
2 has such a width that the light receiving elements 6a and 6b can be inserted so as not to float up. On the other hand, the lower slit 12j is held so that the light receiving elements 6a and 6b protrude toward the lower tray 10, that is, the light receiving elements 6a and 6b are bent at the bent portions 12g and 12h of the tray 12, respectively. An arc-shaped arm 12k supporting the light receiving elements 6a and 6b is projected from the bottom plate 12a into the slit 12j.

In the lower tray 10, the optical fibers 2 and 8 and the optical components 4a, 4b, 5a, 5b, 6a, 6b, and
In order to configure one system of optical amplifier by arranging 7a, 7b,...

As shown in FIG. 7, the outlet 1 of the bottom plate 10a
The fusion splicing portion 8 is provided in the slit 10c located farthest from 0f, and the isolators 5a,
5b are arranged respectively, and the multiplexers 4a, 4b and the splitters 7a, 7b are arranged close to the isolators 5a, 5b. Further, the light receiving elements 6a and 6b are arranged in the upper slit 10e adjacent to the outlet 10f.

On the other hand, the optical fiber 2 for amplification and the optical fiber 8 for intermediate connection are not shown in FIG.
The optical fiber 8 is circulated along 0 g and 10 h, and an intermediate connection optical fiber 8 connecting the multiplexers 4 a and 4 b and the excitation light sources 3 a and 3 b is drawn out of the lower tray 10 through the notch 10 i. Further, one end of a lead wire (not shown) is
a, 6b, and the other end of the lead wire is drawn out of the tray 10 from the outlet 10f.

Next, the optical fibers 2 and 8 and the optical components 4a, 4b, 5a, 5b, 6a and 6a shown in FIG.
In order to configure one system of optical amplifier by arranging 6b, ...
Proceed as follows.

As shown in FIG. 8, the outlet 1 of the bottom plate 12a is provided.
The fusion spliced portion 8 is formed in the slit 12c located farthest from 2f, and the isolator 5a,
5b are arranged respectively, and the multiplexers 4a, 4b and the splitters 7a, 7b are arranged close to the isolators 5a, 5b. Further, the light receiving elements 6a and 6b are arranged in the lower slit 12j close to the outlet 12f. For example, as shown in FIG. 9, one light receiving element 6a is hooked on an arm 12k to be held in a slit 12j.

On the other hand, the optical fiber 2 for amplification and the optical fiber 8 for intermediate connection are not shown in FIG.
The optical fiber 8 is circulated along 2g and 12h, and the optical fiber 8 for intermediate connection connecting the multiplexers 4a and 4b and the excitation light sources 3a and 3b is drawn out of the upper tray 12 through the notch 12i. Further, one end of a lead wire (not shown) is
a, 6b, and the other end of the lead wire is drawn out of the tray 12 from the outlet 12f.

In this way, the optical fibers 2 and 8 and the various optical components 4a, 4b, 5a, 5b and 6 constituting the optical amplifier are formed.
a, 6b, 7a, 7b,...
It can be stored and arranged densely and orderly on the top.

FIG. 10 is a perspective view of a case 14 for storing the trays 10 and 12 in a stacked state.

The case 14 comprises a box-shaped case main body 16 having an upper opening, and a flat lid 18 for closing the opening of the case main body 16.

In the case of the first embodiment, the case body 16 has a depth corresponding to the thickness of the upper tray 12 stacked on the lower tray 10, and an electrode terminal is provided substantially at the center of the bottom 16a. Nineteen fixing holes 16b are provided, and one side of the peripheral wall 16c is provided with each notch 10 of each of the trays 10 and 12.
A U-shaped notch 16d is formed at a position corresponding to i, 12i. Further, flanges 16e projecting inward are provided at the four corners of the peripheral wall 16, and mounting holes 16f for fixing the lid 18 are formed in each flange 16e.

Reference numeral 18a denotes a hole provided in the cover 18 for screw insertion.

As shown in FIGS. 7 and 8, when a system of optical amplifiers is constructed for each of the trays 10 and 12, next, as shown in FIG.
While the electrode terminals 19 are fixed to b, the upper tray 12 is stacked on the lower tray 10. At this time, the positions of the light receiving elements 6a and 6b arranged on the lower tray 10 are restricted while projecting upward through the slits 12e at the corresponding positions of the upper tray 12, so that the light receiving elements 6a and 6b are restricted.
The upper tray 12 is not lifted up by a and 6b. On the other hand, the light receiving elements 6a and 6b arranged on the upper tray 12 protrude toward the lower tray 10 and are restricted in position by the slit 10e at the corresponding position.

Then, the trays 10 and 12 are stored in the case body 16 in a stacked state. At this time, the notches 10 are provided at the four corners of the trays 10 and 12.
Since the b and 12b are provided, the trays 10 and 12 can be smoothly inserted into the case body 16. Also,
At this time, if the notches 10i and 12i of the trays 10 and 12 are made to face the notches 16d of the case body 16, the optical fiber 8 for intermediate connection passes through the notches 16d and the case 1
4 Pulled out.

The outlets 10 of the trays 10 and 12
The lead wires (not shown) drawn out of the tray through f and 12f are connected to the electrode terminals 19 of the main body case 16. As a result, the optical fibers 2, 8 and the various optical components 4a, 4b, 5 already arranged on the respective trays 10, 12 are formed.
The light receiving elements 6a, 6b can be electrically drawn out of the case 14 without obstructing the arrangement of the elements a, 5b, 6a, 6b, 7a, 7b,.

Finally, the cover 18 is fixed to the mounting hole 16f of the main body case 16 with a screw (not shown) so that both trays 1
0 and 12 are stored in the case 14 without play.

As described above, in the case 14, the optical amplifiers are arranged in a systematic manner for each system, so that the assembling property is good, and it is possible to easily find out and repair the faulty part of the device.

In the first embodiment, the case where the two trays 10 and 12 are stacked and accommodated in the single case 14 has been described. However, the present invention is not limited to this. It is also possible to adopt a configuration in which the trays 10 and 12 are stacked in multiple layers such as layers.

Embodiment 2 In Embodiment 2, a case will be described in which the bidirectional pumping type optical amplifier shown in FIG. 19 is configured for only one system.

The second embodiment has one type of a thin tray 20 and a wiring board 22 housed in the tray 20, and the optical fibers 2, 8, which are components of the optical amplifier, are placed on the wiring board 22. And various optical components 4a, 4b, 5a, 5b, 6
a, 6b, 7a, 7b,... are arranged.

FIG. 12 is a plan view of the tray 20, FIG. 13 is a sectional view taken along line EE of FIG. 12, and FIG. 14 is FF of FIG.
It is sectional drawing which follows a line.

Although the tray 20 is formed by processing a stainless steel plate in this embodiment, a metal such as copper or phosphor bronze, a plastic, or the like may be used.

The tray 20 is thin and has a thickness of about 6 to 8 mm, and has a bottom plate 20a which is substantially rectangular in a plan view. At the four corners of the bottom plate 20a, screw holes 20p for mounting the wiring board 22 are provided. A fixing hole 20m for the electrode terminal 24 is provided substantially at the center of the bottom plate 20a, and the light receiving elements 6a, 6a are provided at four positions away from the fixing hole 20m.
An escape hole 20n is formed to prevent the lead wire b from contacting the bottom 20a of the tray 20. Further, bent portions 20g and 20h for suppressing the projection of the optical fibers 2 and 8 and binding them are directed toward the inside of the tray at portions of the peripheral wall rising from the upper, lower, left and right sides of the bottom plate 20a of the tray 20. It is folded back. A pair of U-shaped notches 20 i for drawing out the optical fiber 8 for intermediate connection to the outside of the tray 20 is provided in a portion of the peripheral wall adjacent to the bent portion 20 g on one side (right side). .

FIG. 15 is a plan view of the wiring board 22.

Although the wiring board 22 is formed by processing glass epoxy in this embodiment, a material such as bakelite can be used.

The notches 22a, 22b for fitting into the tray 20 are provided at positions corresponding to the bent portions 20g, 20h of the tray 20 on the front, rear, left, and right sides of the wiring board 22.
Are formed. On the wiring board 22, optical components (in particular, the light receiving elements 6a and 6b in this case) are electrically connected to the tray 2.
A wiring pattern 22x for drawing out to the outside is formed in advance, and one end of the wiring pattern 22x is connected to a through hole 22y as a connection portion provided substantially at the center corresponding to the fixing hole 20m of the tray 20, and the other end is connected to the tray. 20 are connected to through holes 22z provided at locations corresponding to the escape holes 20n. A relatively short slit 22c for regulating the position of the light receiving elements 6a and 6b is formed at a position close to the through hole 22z on the other end side of the wiring pattern 22x.

The upper and lower cutouts 22 of the wiring board 22
The optical components 4a, 4b, 5a, 5b,
The slits 7a, 7b,... For regulating the position extend in parallel with each other.

Of the above slits, the outermost slit 22d is for disposing the branching devices 7a, 7b, the inner slit 22e is for disposing the multiplexers 4a, 4b, and the innermost slit 22f is for the isolator 5a, 5b.

Reference numeral 22g denotes a slit for disposing a binding component for binding and holding a predetermined number of optical fibers 2 and 8, and 22h denotes a screw insertion hole for fixing the wiring board 22 to the tray 20 with screws. is there.

On the tray 20 and the semiconductor substrate 22, the optical fibers 2, 8 and the optical components 4a, 4b, 5a, 5b, 6a, 6b,
In order to configure the optical amplifier of one system shown in FIG. 19 by arranging 7a, 7b,...

As shown in FIGS. 16 to 18, the electrode terminals 24 are fixed in the fixing holes 20m of the tray 20.

On the other hand, the wiring pattern 22x of the wiring board 22
The light receiving elements 6a and 6b are arranged in the slit 22c close to the slit 22c, and their lead terminals are connected to the through holes 22z.
Then, the wiring board 22 is inserted into the tray 20, the electrode terminals 24 are connected to the through holes 22y, and the screws 30 are screwed into the screw holes 20p of the tray 20 through the holes 22h of the wiring board 22 to fix the wiring board 22. Fix to tray 20.

Next, of the slits 22d, 22e and 22f extending in parallel with each other of the wiring board 22, the branching devices 7a and 7b are provided in the outermost slit 22d, and the multiplexers 4a and 4b are provided in the inner slit 22e. And the isolators 5a and 5b are respectively arranged in the slits 22f on the inner side.

Next, a binding component 26 is fitted into the slits 22g at the four corners of the wiring board 22. The optical fiber 2 for amplification and the optical fiber 8 for intermediate connection are as shown in FIG.
Although they are not shown, they are bound by the binding parts 26 so that they do not disperse while making a round along the bent portions 20g and 20h. The fusion splicing section 9 is arranged in a recess formed by the upper and lower cutouts 22 a of the wiring board 22 and the bottom plate 20 a of the tray 20 as a result of placing the wiring board 22 on the tray 20. Further, the multiplexers 4a, 4b and the excitation light sources 3a,
The optical fiber 8 for the intermediate connection connecting the optical fiber 3b and the optical fiber 8 is cut out 20i.
Through the tray 20 to the outside. Finally, an assembly is completed by attaching a lid (not shown) from above the tray 20.

As described above, in the second embodiment, since the wiring board 22 is disposed in the tray 20 and the light receiving elements 6a and 6b are connected to the electrode terminals 24 via the wiring patterns 22x, the light receiving elements 6a and 6b When the lead is electrically pulled out of the tray 20, the inconvenience that the lead wire unexpectedly crosses and damages the optical fibers 2, 8 can be eliminated.

In the second embodiment, the case where one system of optical amplifier is constituted has been described. However, as in the case of the first embodiment, a plurality of trays 20 shown in FIG. It is of course possible to construct a module.

In the first and second embodiments, FIG.
The description has been given of the case where the present invention is applied to the bidirectional pumping type optical amplifier shown in the above, but the forward pumping type in which the pumping light is introduced only from the input side of the signal light of the amplification optical fiber or the pumping only from the signal light output side. The present invention can be applied to a backward-pumped optical amplifier for introducing light.

[0068]

According to the present invention, the following effects can be obtained.

(1) According to the first aspect of the present invention, the optical fibers and various optical components constituting the optical amplifier can be arranged with high density and orderly, and the device can be easily made thin and small. it can.

(2) According to the second aspect of the present invention, an optical fiber or optical fiber already disposed on the tray is provided at a substantially central portion of the bottom plate of the tray through an outlet for electrically drawing out the optical component to the outside of the tray. Without disturbing the placement of parts, etc.
The optical component can be electrically connected to the outside.

(3) According to the third aspect of the present invention, since the optical component is drawn out of the tray via the wiring pattern and the connecting portion, it is possible to eliminate the inconvenience that the lead wire crosses the optical fiber.

(4) According to the fourth aspect of the present invention, in a module in which a plurality of systems are grouped together, a plurality of optical amplifiers are arranged in an orderly manner for each system, so that the assemblability is good and the failure location of the device is good. Can easily be found and repaired.

[Brief description of the drawings]

FIG. 1 is a plan view of a lower tray used to configure an optical amplifier in Embodiment 1 of the present invention.

FIG. 2 is a cross-sectional view taken along line AA of FIG.

FIG. 3 is a sectional view taken along line BB of FIG. 1;

FIG. 4 is a plan view of an upper tray used to configure an optical amplifier in Embodiment 1 of the present invention.

FIG. 5 is a sectional view taken along the line CC of FIG. 4;

FIG. 6 is a sectional view taken along the line DD in FIG. 4;

FIG. 7 is a plan view showing a state where various optical components are arranged on a lower tray of FIG. 1;

FIG. 8 is a plan view showing a state where various optical components are arranged on an upper tray of FIG. 4;

FIG. 9 is a perspective view showing a state where a light receiving element is attached to an upper tray.

FIG. 10 is a perspective view of a case in which a lower tray and an upper tray are stacked and stored.

FIG. 11 is a sectional view showing a state where the lower tray and the upper tray are stacked and housed in a case;

FIG. 12 is a plan view of a tray used to configure an optical amplifier in Embodiment 2 of the present invention.

FIG. 13 is a sectional view taken along the line EE in FIG. 12;

FIG. 14 is a sectional view taken along the line FF in FIG. 12;

FIG. 15 is a plan view of a wiring board used to configure an optical amplifier according to a second embodiment of the present invention.

FIG. 16 is a plan view showing a state where various optical components are arranged on the wiring board of FIG. 14 and stored in a tray;

FIG. 17 is a sectional view taken along the line GG of FIG. 16;

18 is a sectional view taken along the line HH in FIG.

FIG. 19 is a diagram showing a configuration of one system of a bidirectional pumping type optical amplifier.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Optical amplifier, 2 ... Amplifying optical fiber, 3a, 3b ... Pump light source, 4a, 4b ... Multiplexer, 5a, 5b ... Isolator, 6
a, 6b: light receiving element, 7a, 7b: branching device, 8: optical fiber for intermediate connection, 9: fusion splicing part, 10: lower tray, 1
0g, 10h: bent part, 10c, 10d, 10e: slit, 10f: outlet, 12: upper tray, 12g, 12h
... Bends, 12c, 12d, 12e, 12j ... Slits, 1
4 ... case, 20 ... tray, 20 g, 20 h ... bent part, 2
2. Wiring board, 22c, 22d, 22e, 22f, 22g ...
Slit, 22y ... through hole (connection part).

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Tadahiko Nakai 4-3 Ikejiri, Itami-shi, Hyogo Mitsubishi Electric Cable Co., Ltd. Itami Works F-term (reference) 5F072 AK06 HH02 JJ01 KK24 KK30 PP07 YY17 5K002 AA07 BA02 BA05 BA13 CA13 FA01

Claims (4)

[Claims] 1. An optical amplifier comprising: an amplification optical fiber for directly amplifying signal light based on a stimulated emission effect; and optical components such as a multiplexer and a light receiving element, wherein the optical fibers and the optical components are arranged. A slit for regulating the position of the optical component is formed at a predetermined position on the bottom plate of the tray, and optical fiber bundles are formed at a plurality of positions around the bottom plate of the tray. An optical amplifier characterized in that a bent portion for use is folded back toward the inside of the tray. 2. The optical amplifier according to claim 1, wherein an outlet for electrically extracting the optical component to the outside of the tray is formed at a substantially central portion of a bottom plate of the tray. Optical amplifier. 3. The optical amplifier according to claim 1, wherein, instead of providing a slit on the bottom plate of the tray, a wiring board is placed on the bottom plate of the tray, and a slit is formed in the wiring board. An optical amplifier, wherein a connection portion for electrically pulling out the optical component to the outside of the tray via a wiring pattern is provided at a substantially central portion. 4. The optical amplifier according to claim 1, wherein a plurality of trays on which the optical fibers, optical components, and the like are arranged are sequentially stacked in a single case. An optical amplifier, wherein the optical amplifier is housed in the optical amplifier.