JP2002064429A - Optical multiplex transmission device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vensatile optical multiplex transmission device wherein its dispersion compensating portion and its optical amplifying portion are mounted on a board to miniaturize it in the form of a flat plate, and the alteration and extension of its dispersion portion, etc., are facilitated. SOLUTION: In a transmission device unit A1, a dispersion compensating portion 1 and an optical amplifying portion 2 are mounted on a board 4 to connect the both with each other. This connection is performed by welding to each other fibers 5 drawn out respectively from the dispersion compensating portion 1 and the optical amplifying portion 2. In order to use the transmission device units by connecting a plurality of them in series or parallel with each other correspondingly to an optical transmission line 3, they are inserted into a rack-form case to configure them as an appliance.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical multiplex transmission apparatus having a dispersion compensator and an optical amplifier in an optical transmission line.

[0002]

2. Description of the Related Art Conventionally, in an optical multiplex transmission apparatus, FIG.
As shown in (1), a dispersion compensator 1 that compensates for light dispersion by adding an opposite phase to light distortion, and an optical amplifier that has a function of performing optical amplification to compensate for attenuation of light generated at the time of dispersion compensation 2 is provided in the optical transmission path 3.

The dispersion compensating unit 1 and the optical amplifying unit 2 are configured as separate units, and a device in which both fiber cables are directly joined is generally used. For example, Japanese Patent Application Laid-Open No. 9-46318 (first conventional example) discloses a technique in which a wavelength dispersion device and an optical amplifier are provided in an optical transmission device.
Japanese Patent Application Laid-Open No. 9-261173 (second conventional example) discloses a technique in which a plurality of dispersion compensating fibers are provided and an optical switch is used to selectively select the fibers.

[0004] Also, a technology in which a chromatic dispersion compensating unit and an optical amplifying unit are integrated is disclosed in Japanese Patent Application Laid-Open No. H11-122171 (No. 3).
Conventional Example).

[0005]

In the conventional optical multiplex transmission apparatus, the dispersion compensator 1 and the optical amplifier 2 are configured as separate units (first and second conventional examples). Need to be joined by fiber cable joining or connector joining, which not only requires a large number of manufacturing steps, but also results in a structure in which a long cable of several meters is wired at the joining portion, thus increasing the space for the device. Also, the dispersion compensator 1
However, it is difficult to change or add a new one, and there is a problem of lack of versatility.

In the third conventional example, a circuit configuration in which a chromatic dispersion compensator and an optical amplifier are integrated is shown, but the specific structure of the device is not shown, and the above problem is solved. Not.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems. A dispersion compensating unit and an optical amplifying unit are mounted on a substrate, and are reduced in size to a flat plate. It is an object of the present invention to provide an optical multiplex transmission apparatus which can be easily added and expanded and is versatile.

[0008]

In an optical multiplex transmission apparatus according to the present invention, a dispersion compensator and an optical amplifier are mounted on a single substrate.

In the optical multiplex transmission apparatus according to the present invention, the dispersion compensator is removably mounted on the board and connected to the optical amplifier and the optical transmission line via an optical connector provided in the dispersion compensator. Things.

In the optical multiplex transmission apparatus according to the present invention, a fitting portion is formed on a substrate, and an optical connector is fitted and connected to the fitting portion.

An optical multiplex transmission apparatus according to the present invention has a plurality of sets of a dispersion compensation section and an optical amplification section mounted in series.

An optical multiplex transmission apparatus according to the present invention is one in which a plurality of sets of a dispersion compensator and an optical amplifier are connected in parallel.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below. Embodiment 1 FIG. FIG. 1 is a plan view showing an optical multiplex transmission apparatus according to Embodiment 1 of the present invention. In FIG. 1, reference numeral 1 denotes a dispersion compensator, 2 denotes an optical amplifier, 3 denotes an optical transmission line, 4 denotes a substrate,
5 is a fiber connecting the dispersion compensator 1 and the optical amplifier 2;
A1 is a transmission device unit. The dispersion compensator 1 compensates for light distortion in the optical transmission line 3 with an optical signal having an opposite phase, and the optical amplifier 2 compensates for the attenuation of the optical signal and amplifies the optical signal so that the optical signal can be transmitted far. Things. In the first embodiment, the dispersion compensating unit 1 and the optical amplifying unit 2 are mounted on the substrate 4 and both are connected. This connection is performed by welding fibers 5 coming out of each of the dispersion compensator 1 and the optical amplifier 2.

The optical amplifying unit 2 amplifies the attenuation of light in the optical transmission line 3, and a common optical amplifier is used even if the optical transmission lines 3 are different. On the other hand, since the dispersion compensator 1 having different characteristics depending on the length of the optical transmission line 3 is used, a transmission device unit A1 in which a plurality of types of dispersion compensators 1 having different characteristics are mounted is prepared. .

Since a plurality of such transmission device units A1 are used in series or in parallel connection in accordance with the optical transmission line 3, they are inserted into a rack-shaped case and configured as one device. In this case, since the transmission device unit A1 in the first embodiment is configured as a flat transmission device unit, the device can be easily attached to and detached from the case and can be a compact device (the following transmission device units A2 to A6 are also applicable). Similar).

As means for mounting, fixing is carried out by bonding, mounting, band fastening or any other means (the same applies to the following embodiments).

As described above, according to the first embodiment, since the dispersion compensating unit 1 and the optical amplifying unit 2 are mounted on the substrate 4, the transmission device unit A1 is reduced in size to a flat plate. There is an effect that arbitrary plural sheets can be stored compactly in a rack-shaped case.

Embodiment 2 FIG. FIG. 2 is a plan view showing an optical multiplex transmission apparatus according to a second embodiment of the present invention. In FIG. 2, the dispersion compensating section 1 and the optical amplifying section 2 are configured as an integrated dispersion compensating / amplifying section 6. The dispersion compensating / amplifying unit 6 is mounted on the board 4 to form a transmission unit A2. The dispersion compensating / amplifying unit 6 has a structure integrated at the time of manufacturing. Thus, the same effect as in the first embodiment can be obtained.

Embodiment 3 FIG. 3 is a plan view showing an optical multiplex transmission apparatus according to Embodiment 3 of the present invention. In FIG. 3, reference numerals 7 and 8 denote optical connectors provided at both ends of the fiber of the dispersion compensator 1, and reference numeral 9 denotes an optical transmission line. The optical connector 10 provided on the optical amplification unit 2 is provided with an optical connector 3. The optical amplifying unit 2 is mounted on the substrate 4 as in the first embodiment, to form a transmission unit A3. Then, one optical connector 7 of the dispersion compensating unit 1 is connected to the optical connector 9 of the optical transmission line 3 and the other optical connector 8 is connected to the optical connector 10 of the optical amplifying unit 2. Has a structure detachably mounted on the substrate 4.

As described above, according to the third embodiment, since the dispersion compensator 1 is detachable, if a plurality of dispersion compensators 1 having different characteristics are prepared, the optical compensator can be used in an optical transmission line. In addition, the most suitable transmission device unit A3 can be used, and the versatility is improved.

Embodiment 4 FIG. FIG. 4 is a plan view showing an optical multiplex transmission apparatus according to a fourth embodiment of the present invention, and shows an example of a specific structure when an optical connector is used as in the third embodiment. A fitting portion 12 having a plurality of holes 11 is provided at an edge of the substrate 4. The optical connector 7 provided in the dispersion compensator 1 and the optical connector 9 provided in the optical transmission path 3 are fitted into the holes 11 so that both connectors 7,
9 is connected. Further, the optical connector 8 on the opposite side of the dispersion compensator 1 and the optical connector 10 of the optical amplifier 2 are connected.

As described above, according to the fourth embodiment, since the fitting portion 12 is provided on the substrate 4, the connection can be reliably performed by inserting the optical connectors 7, 9 from both sides.

Embodiment 5 FIG. 5 is a plan view showing an optical multiplex transmission apparatus according to Embodiment 5 of the present invention. In FIG. 5, two sets of a dispersion compensator 1 and an optical amplifier 2 are mounted in series. The number of the series connection is arbitrary.

As described above, according to the fifth embodiment, a transmission apparatus unit A5 in which an arbitrary number of dispersion compensators 1 and optical amplifiers 2 are connected in series is obtained.

Embodiment 6 FIG. FIG. 6 is a plan view showing an optical multiplex transmission apparatus according to Embodiment 6 of the present invention. In FIG. 6, two sets of a dispersion compensator 1 and an optical amplifier 2 are mounted in parallel. The number of parallel connections is arbitrary.

As described above, according to the sixth embodiment, a transmission unit A6 in which an arbitrary number of dispersion compensators 1 and optical amplifiers 2 are connected in parallel is obtained.

In the fourth and fifth embodiments, similarly to the third embodiment, the dispersion compensator 1 can be configured to be detachable with an optical connector.

FIG. 7 shows an example of the configuration of an optical multiplex transmission system using a dispersion compensator and an optical amplifier. In the first stage, the optical amplifier 2 connected in series with the dispersion compensator 1a
a, the outputs of the optical amplifiers 2b connected in series with the dispersion compensator 1b enter the optical combiner 13A, respectively.
The outputs of the optical amplifier 2c connected in series with the optical amplifier 2d and the output of the optical amplifier 2d connected in series with the dispersion compensator 1d respectively enter the optical combiner 13B and are optically combined. In the second stage, the outputs of the optical amplifier 2e connected in series with the dispersion compensator 1e and the output of the optical amplifier 2f connected in series with the dispersion compensator 1f enter the optical combiner 13C and are optically combined. In the third stage, the dispersion compensating unit 1g and the optical amplifying unit 2g and the dispersion compensating unit 1h and the optical amplifying unit 2h are sequentially connected in series, and an optical signal is transmitted from the optical transmission line 3.

In the transmission system as shown in FIG.
For example, in the first stage, each of the dispersion compensator 1a and the optical amplifier 2
a, the dispersion compensating unit 1b and the optical amplifying unit 2b, the dispersion compensating unit 1c and the optical amplifying unit 2c, and the dispersion compensating unit 1d and the optical amplifying unit 2d, respectively.
Is used, and in the second stage, the dispersion compensator 1e
The transmission unit A1, A2 or A3 of the first, second or third embodiment is used for the optical amplifier 2e, the dispersion compensator 1f and the optical amplifier 2f. Further, in the third stage, the transmission device unit A6 of the sixth embodiment is used for the dispersion compensating unit 1g and the optical amplifying unit 2g and the dispersion compensating unit 1h and the optical amplifying unit 2h. Alternatively, in the first stage, the dispersion compensating units 1a and 1b and the optical amplifying units 2a and 2b are set as one set, and the dispersion compensating units 1c and 1d and the optical amplifying units 2c and 2d are set as one set. The transmission device unit A6 of mode 6 can also be used. In the second stage, the dispersion compensating unit 1e and the optical amplifying unit 2e, and the dispersion compensating unit 1f and the optical amplifying unit 2f can also use the transmission apparatus unit A6 of the sixth embodiment as one set.

[0030]

As described above, according to the present invention, since the dispersion compensating section and the optical amplifying section are mounted on the substrate, a transmission apparatus unit which is reduced in size to a flat plate is constructed.
This has the effect that it can be easily attached to and detached from the rack-shaped case body, and that arbitrary plural sheets can be stored compactly.

According to the present invention, since the dispersion compensator is detachable, if a plurality of dispersion compensators having different characteristics are prepared, the most suitable one can be used according to the optical transmission line. There is an effect that the property is improved.

According to this invention, since the fitting portion is provided on the substrate, there is an effect that the optical transmission line and the dispersion compensating portion can be reliably connected by inserting the optical connectors from both sides.

According to the present invention, there is an effect that a small transmission device unit in which an arbitrary number of dispersion compensating units and optical amplifying units are connected in series or in parallel can be obtained.

[Brief description of the drawings]

FIG. 1 is a plan view showing an optical multiplex transmission apparatus according to Embodiment 1 of the present invention.

FIG. 2 is a plan view showing an optical multiplex transmission apparatus according to Embodiment 2 of the present invention.

FIG. 3 is a plan view showing an optical multiplex transmission apparatus according to Embodiment 3 of the present invention.

FIG. 4 is a plan view showing an optical multiplex transmission device according to a fourth embodiment of the present invention.

FIG. 5 is a plan view showing an optical multiplex transmission apparatus according to Embodiment 5 of the present invention.

FIG. 6 is a plan view showing an optical multiplex transmission apparatus according to Embodiment 6 of the present invention.

FIG. 7 is a block diagram of an optical multiplex transmission system using a dispersion compensator and an optical amplifier.

FIG. 8 is a configuration diagram of a conventional optical multiplex transmission device.

[Explanation of symbols]

1, 1a to 1h dispersion compensator, 2, 2a to 2h optical amplifier, 3 optical transmission line, 4 substrates, 5 fibers, 6 dispersion compensator / amplifier, 7, 8, 9, 10 optical connector, 11
Holes, 12 fitting parts, 13A, 13B, 13C photosynthesis part, A1, A2, A3, A5, A6 Transmission device unit.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H04B 10/12

Claims (5)

[Claims] 1. An optical multiplex transmission apparatus in which an optical amplifier for amplifying light attenuation is connected to a dispersion compensator for compensating optical dispersion in an optical transmission line, wherein the dispersion compensator and the optical amplifier are a single substrate. An optical multiplex transmission device, which is mounted on a device. 2. The dispersion compensating unit is removably mounted on the substrate, and is connected to an optical amplifying unit and an optical transmission line via an optical connector provided in the dispersion compensating unit. 2. The optical multiplex transmission device according to 1. 3. The optical multiplex transmission apparatus according to claim 2, wherein a fitting portion is formed on the substrate, and an optical connector is fitted and connected to the fitting portion. 4. The apparatus according to claim 1, wherein a plurality of sets of the dispersion compensating unit and the optical amplifying unit are mounted on the board in a state of being connected in series. Optical multiplex transmission equipment. 5. The apparatus according to claim 1, wherein a plurality of sets of the dispersion compensating section and the optical amplifying section are mounted on the substrate in a state of being connected in parallel. Optical multiplex transmission equipment.