CN210839596U - Wavelength division multiplexing system and wavelength division multiplexing system for CWDM signal transmission - Google Patents
Wavelength division multiplexing system and wavelength division multiplexing system for CWDM signal transmission Download PDFInfo
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- CN210839596U CN210839596U CN201922385796.8U CN201922385796U CN210839596U CN 210839596 U CN210839596 U CN 210839596U CN 201922385796 U CN201922385796 U CN 201922385796U CN 210839596 U CN210839596 U CN 210839596U
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Abstract
The utility model discloses a wave distribution system for CWDM signal transmission, include: a first wavelength division multiplexer/demultiplexer; at least two first optical fibers; and at least two first bidirectional optical fiber modules, wherein each first bidirectional optical fiber module is connected with the first wavelength division multiplexer/demultiplexer through one first optical fiber. The utility model also discloses a wavelength division multiplexing system for CWDM signal transmission. The utility model discloses can reduce the consumption of optical module, optic fibre and wavelength division box resource.
Description
Technical Field
The utility model relates to a CWDM signal transmission field, specifically speaking relates to a wave division distribution system and wavelength division multiplexing system for CWDM signal transmission.
Background
In the existing CWDM signal transmission field, a dual-fiber bidirectional optical module and a wavelength division multiplexer/demultiplexer are mostly used for wavelength division multiplexing, and the consumed optical module resources and optical fiber resources are too large.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to solve the basis of above-mentioned problem, reduce the consumption of optical module, optic fibre and wavelength division box resource.
The utility model discloses a following technical scheme realizes:
first aspect of the present invention
A first aspect of the present invention provides a wave distribution system for CWDM signal transmission, comprising:
a first wavelength division multiplexer/demultiplexer;
at least two first optical fibers; and
at least two first bidirectional optical fiber modules, each of the first bidirectional optical fiber modules being connected to the first wavelength division multiplexer/demultiplexer via one of the first optical fibers,
each first single-fiber bidirectional optical module corresponds to a first channel and a second channel, the first channel and the second channel respectively transmit optical signals with different wavelengths, and the transmission directions of the first channel and the second channel are opposite.
Optionally, the wavelength distribution system transmits an optical signal with a wavelength of 1267.5nm-1374.5 nm.
Optionally, the wavelength distribution system may further include a second bidirectional optical fiber module, wherein the number of the second bidirectional optical fiber modules is 6 to 12.
Optionally, the wavelength distribution system may further include a wavelength division filter, wherein the wavelengths of the plurality of transmitted optical signals sequentially increase or decrease, and a wavelength interval between two adjacent optical signals is 7 nm.
Second aspect of the present invention
On the basis of the first aspect of the present invention, the second aspect of the present invention further provides a wavelength division multiplexing system for CWDM signal transmission, which applies the above-mentioned wavelength division multiplexing system.
Optionally, the wavelength division multiplexing system includes:
the first wavelength division multiplexer/demultiplexer and the second wavelength division multiplexer/demultiplexer are in communication connection with each other;
a plurality of said first and second optical fibers; and
at least two pairs of bidirectional optical fiber modules, each pair of the bidirectional optical fiber modules includes a first bidirectional optical fiber module and a second bidirectional optical fiber module matched with the first bidirectional optical fiber module, each first bidirectional optical fiber module is connected to the first wavelength division multiplexer/demultiplexer through a first optical fiber, and each second bidirectional optical fiber module is connected to the second wavelength division multiplexer/demultiplexer through a second optical fiber;
wherein, in each pair of the single-fiber bidirectional optical modules, the second single-fiber bidirectional optical module corresponds to the same first channel and second channel as the first single-fiber bidirectional optical module,
when transmitting optical signals in the same channel, the receiving end and the sending end of the first single-fiber bidirectional optical module and the second single-fiber bidirectional optical module for transmitting optical signals are arranged oppositely.
Optionally, the wavelength division multiplexing system, wherein a transmission rate of the optical signal in the wavelength division multiplexing system is 25 Gbps.
Optionally, the wavelength division multiplexing system may transmit at least 24 optical signals with different wavelengths simultaneously.
Optionally, the wdm system is configured such that the number of channels for transmission in operation of the wdm system is set to 12.
The third aspect of the present invention
On the basis of the first aspect and the second aspect of the present invention, the third aspect of the present invention further provides a wavelength division multiplexing system for CWDM signal transmission, the wavelength division multiplexing system includes:
a first wavelength division box with the built-in first wavelength division multiplexer/demultiplexer and a second wavelength division box with the built-in second wavelength division multiplexer/demultiplexer, wherein the first wavelength division multiplexer/demultiplexer and the second wavelength division multiplexer/demultiplexer are in communication connection;
a plurality of said first optical fibers and said second optical fibers; and
at least two pairs of the bidirectional optical single-fiber modules, wherein each pair of the bidirectional optical single-fiber modules comprises one first bidirectional optical single-fiber module and one second bidirectional optical single-fiber module;
wherein, a plurality of first optical fiber interfaces matched with the first optical fibers are arranged on the first wavelength division box, the first optical fiber interfaces are connected with the first wavelength division multiplexer/demultiplexer, each first single-fiber bidirectional optical module is connected with the corresponding first optical fiber interface through one first optical fiber,
a plurality of second optical fiber interfaces matched with the second optical fibers are arranged on the second wavelength division box, the second optical fiber interfaces are connected with the second wavelength division multiplexer/demultiplexer, each second single-fiber bidirectional optical module is connected with the corresponding second optical fiber interface through one second optical fiber,
in each pair of the bidirectional optical single-fiber modules, the second bidirectional optical single-fiber module corresponds to the same first channel and second channel as the first bidirectional optical single-fiber module,
when transmitting optical signals in the same channel, the receiving end and the transmitting end of the first single-fiber bidirectional optical module and the second single-fiber bidirectional optical module for transmitting optical signals are arranged oppositely,
the wavelengths of the transmitted optical signals are sequentially increased or decreased, the wavelength interval between two adjacent optical signals is 7nm,
the transmission rate of the optical signal in the wavelength division multiplexing system is 25 Gbps.
The embodiment of the utility model provides a possess following beneficial effect at least:
the utility model discloses an in the wave distribution system of some embodiments, every two-way optical module of first single fiber can transmit the light signal of two kinds of different wavelengths, has saved the resource that consumes of optical module and first optic fibre.
Some embodiments of the present invention adopt a single-fiber bidirectional scheme based on a 6-wave wavelength division multiplexer/demultiplexer, and can transmit data amount of 12 optical modules through the function of the wavelength division multiplexer/demultiplexer, that is, can transmit 12 optical signals with different wavelengths; in the conventional technology, a 6-wave wavelength division multiplexer/demultiplexer can only transmit the data volume of 6 optical modules. Therefore, the effect of some embodiments of the present invention is significantly superior to the prior art.
The utility model discloses a some embodiments have reduced the wavelength division box cost, thereby have reduced the operation cost.
Some embodiments of the present invention allocate wavelengths with a 7nm range to improve the accuracy of transmitting optical signals.
Drawings
Fig. 1 is a schematic diagram of signal transmission in some embodiments of the present invention;
fig. 2 is a schematic structural diagram of a first single-fiber bidirectional optical module in some embodiments of the present invention.
Detailed Description
The following further describes embodiments of the present invention with reference to the drawings.
It should be noted that:
wdm (wavelength Division multiplexing) combines a series of optical signals carrying information but with different wavelengths into a single beam, and transmits the beam along a single optical fiber; and separating the optical signals with different wavelengths by a certain method at the receiving end. This technique allows multiple signals to be simultaneously transmitted over an optical fiber, each signal being carried by light of a particular wavelength, which is a wavelength channel.
Cwdm (coarse Wavelength Division multiplexing) is one of WDM communication technologies, and its specific working principle is: utilize optical multiplexer (promptly the utility model discloses in wavelength division multiplexer) multiplex the optical signal of different wavelengths to single optic fibre and transmit, at the receiving terminal, with the help of optical demultiplexer (promptly the utility model discloses in wavelength division multiplexer) decompose the mixed signal in the optic fibre into the signal of different wavelengths, be connected to corresponding receiving arrangement.
First aspect of the present invention
A first aspect of the present invention provides a wave distribution system for CWDM signal transmission, which is described in the following specific first embodiment, so that those skilled in the art can fully understand the design concept, working principle and technical effects of the present invention in the first aspect.
First embodiment
A first embodiment provides a wave distribution system for CWDM signal transmission comprising:
a first wavelength division multiplexer/demultiplexer 11;
at least two first optical fibers 21; and
at least two first bidirectional optical fibre modules 31, each of said first bidirectional optical fibre modules 31 being connected to said first wavelength division multiplexer/demultiplexer 11 via one of said first optical fibres 21,
each of the first single-fiber bidirectional optical modules 31 corresponds to a first channel and a second channel, where the first channel and the second channel respectively transmit optical signals with different wavelengths, and the transmission directions of the first channel and the second channel are opposite.
It should be noted that the first wavelength division multiplexer/demultiplexer 11 may adopt the prior art.
As shown in fig. 1, the working principle of the present embodiment is as follows:
each of the first single-fiber bidirectional optical modules 31 corresponds to a first channel and a second channel, where the first channel and the second channel respectively transmit optical signals with different wavelengths, and the transmission directions of the first channel and the second channel are opposite. For example, the first bidirectional optical fiber module 31 corresponding to the optical signals with the wavelengths of 1267.5nm and 1274.5nm corresponds to a first channel and a second channel, the first channel and the second channel are respectively used for transmitting the optical signals with the wavelengths of 1267.5nm and 1274.5nm, and the transmission directions of the optical signals with the wavelengths of 1267.5nm and 1274.5nm are opposite.
In this wavelength distribution system, each of the first bidirectional optical fiber modules 31 can be used to transmit two types of optical signals through the transmission function of the first channel and the second channel, and only one optical fiber is needed; in the prior art, when an optical module transmits an optical signal (a signal in a first channel or a second channel), the number of optical fibers needs to be doubled, so that the difficulty of wiring construction is increased; therefore, the present embodiment saves resources of the optical module, correspondingly saves resources of the first optical fiber 21, and reduces difficulty of wiring construction.
In the present embodiment, as shown in fig. 1, the wavelength range of the optical signal applied to the wavelength distribution system is preferably 1267.5-1374.5nm, and in some other embodiments, the wavelength range applied to the wavelength distribution system can be extended to 1467.5nm-1574.5 nm.
In addition, the number of the first bidirectional optical single-fiber modules 31 is preferably 6 to 12, and more preferably 6, and the wavelength distribution system shown in fig. 1 selects 6 first bidirectional optical single-fiber modules 31, and can simultaneously transmit 12 optical signals with different wavelengths, which is more suitable for practical applications.
In a further preferred embodiment, in the wavelength distribution system, the wavelengths of the plurality of transmitted optical signals sequentially increase or decrease, and the wavelength interval between two adjacent optical signals is 7 nm. The wavelength is allocated in the range of 7nm in order to improve the accuracy of transmitting the optical signal. In the conventional 12-wave optical signal transmission scheme, a dual-fiber bidirectional optical module is adopted and optical signals with wavelengths of 1271-1371nm and 1471-1491nm are selected for transmission, while optical signals with wavelengths of 1471-1491nm have large dispersion, which is not favorable for long-distance 10km transmission. In the preferred embodiment, the wavelengths are allocated in the range of 7nm, that is, 12 optical signals with different wavelengths can be selected from 1271-1371nm, thereby avoiding the problem that the selected optical signals may have large dispersion.
More specifically, in some embodiments, the first bidirectional optical fiber module 31 includes at least a fiber patch cord socket adapter, an optical transmitter (LD TO-CAN)300, an optical receiver (RX TO-CAN)400, a faraday rotator, and the like; referring TO fig. 2, a 0-degree faraday rotation plate 100 and a 45-degree faraday rotation plate 200 are sequentially disposed between an optical fiber patch cord jack and an optical transmitter (LD TO-CAN) 300; linearly polarized light emitted from an optical transmitter (LD TO-CAN)300 enters the 45-degree faraday rotator 200, the linear polarization direction is rotated by 45 degrees TO become p-polarized light, and the p-polarized light is finally coupled into an optical fiber patch cord jack by the 0-degree faraday rotator 100 TO be emitted. The received light entering from the optical fiber jumper interface is totally reflected by the 45-degree faraday rotator 200, and then enters the optical receiver (RX TO-CAN)400 through the 0-degree faraday rotator 100.
Second aspect of the present invention
On the basis of the first aspect of the utility model, the second aspect of the utility model also provides a wavelength division multiplexing system for CWDM signal transmission, wherein, wavelength division multiplexing system uses the utility model discloses a wave distribution system carries out wavelength division multiplexing in the first aspect. For a description of the wavelength division multiplexing system, reference is made in detail to the second embodiment.
Second embodiment
The second embodiment is the same as the first embodiment, please refer to the above description, and the differences between the second embodiment and the first embodiment mainly include the second wavelength division multiplexer/demultiplexer 12, the second optical fiber 22, the second bidirectional optical fiber module 32, and the like, which is described below with reference to fig. 1.
A second embodiment provides a wavelength division multiplexing system including:
the first wavelength division multiplexer/demultiplexer 11 and the second wavelength division multiplexer/demultiplexer 12 are communicatively connected to each other, and the second wavelength division multiplexer/demultiplexer 12 is similar to the first wavelength division multiplexer/demultiplexer 11 in structure and function, and the second wavelength division multiplexer/demultiplexer 12 can be designed with reference to the first wavelength division multiplexer/demultiplexer 11;
a plurality of the first optical fibers 21 and the second optical fibers 22; and
at least two pairs of bidirectional optical fiber modules, each pair of said bidirectional optical fiber modules includes a first bidirectional optical fiber module 31 and a second bidirectional optical fiber module 32 disposed in match with said first bidirectional optical fiber module 31, each of said first bidirectional optical fiber modules 31 is connected to said first wavelength division multiplexer/demultiplexer 11 through a first optical fiber 21, each of said second bidirectional optical fiber modules 32 is connected to said second wavelength division multiplexer/demultiplexer 12 through a second optical fiber 22,
in each pair of the bidirectional optical modules, the second bidirectional optical module 32 corresponds to the same first channel and second channel as the first bidirectional optical module 31,
when transmitting optical signals in the same channel, the receiving end and the transmitting end of the first single-fiber bidirectional optical module 31 and the second single-fiber bidirectional optical module 32 for transmitting optical signals are arranged oppositely.
The operation principle of the second bidirectional optical single-fiber module 32 can be referred to the above description of the first bidirectional optical single-fiber module 31.
In the process of transmitting an optical signal, one of the first single-fiber bidirectional optical module 31 and the second single-fiber bidirectional optical module 32 is selected as a transmitting end, and correspondingly, the other one is selected as a receiving end. For example, when wavelength division multiplexing an optical signal having a wavelength of 1267.5nm, the first bidirectional optical fiber module 31 is a transmitting end, and the second bidirectional optical fiber module 32 is a receiving end. When wavelength division multiplexing an optical signal with a wavelength of 1274.5nm, the first bidirectional optical fiber module 31 is a receiving end, and the second bidirectional optical fiber module 32 is a transmitting end.
As shown in fig. 1, in the left-right direction, the transmitting end and the receiving end of the first bidirectional optical fiber module 31 for transmitting the optical signal may be arranged to be interchanged as needed. The second bidirectional optical fiber module 32 can be arranged as well. As described above with respect to the optical signal having a wavelength of 1267.5nm, when the transmitting end and the receiving end of the first bidirectional optical single-fiber module 31 for transmitting the optical signal are exchanged, the first bidirectional optical single-fiber module 31 becomes the receiving end, and the second bidirectional optical single-fiber module 32 becomes the transmitting end.
Therefore, compared with the prior art, on the basis of ensuring the transmission quality of the optical signal, the present embodiment greatly reduces the number of the first single-fiber bidirectional optical module 31, the second single-fiber bidirectional optical module 32, the first optical fiber 21, and the second optical fiber 22 in the wavelength division multiplexing system, and improves the resource utilization rate.
Preferably, the transmission rate of the optical signal in the wavelength division multiplexing system is 25 Gbps.
Further, in a specific embodiment, the wdm system can transmit at least 24 optical signals with different wavelengths simultaneously.
Preferably, the number of channels for transmission in operation of the wavelength division multiplexing system is set to 12.
The third aspect of the present invention
On the basis of the first and second aspects of the present invention, the third aspect of the present invention further provides a wavelength division multiplexing system for CWDM signal transmission, which is specifically referred to in the third embodiment.
Third embodiment
The third embodiment is mainly different from the first and second embodiments in that a first wavelength division box and a second wavelength division box are provided, and the third embodiment can protect the first wavelength division multiplexer/demultiplexer 11 and the second wavelength division multiplexer/demultiplexer 12.
A wavelength division multiplexing system provided by a third embodiment includes:
a first wavelength division box with the built-in first wavelength division multiplexer/demultiplexer 11 and a second wavelength division box with the built-in second wavelength division multiplexer/demultiplexer 12, wherein the first wavelength division multiplexer/demultiplexer 11 and the second wavelength division multiplexer/demultiplexer 12 are in communication connection;
a plurality of the first optical fibers 21 and the second optical fibers 22; and
at least two pairs of said bidirectional optical fibre modules, each pair of said bidirectional optical fibre modules comprising one said first bidirectional optical fibre module 31 and one said second bidirectional optical fibre module 32;
wherein, a plurality of first optical fiber 21 interfaces matched with the first optical fibers 21 are arranged on the first wavelength division box, the first optical fiber 21 interfaces are connected with the first wavelength division multiplexer/demultiplexer 11, each first bidirectional optical fiber module 31 is connected with the corresponding first optical fiber 21 interface through one first optical fiber 21,
a plurality of second optical fiber 22 interfaces matched with the second optical fibers 22 are arranged on the second wavelength division box, the second optical fiber 22 interfaces are connected with the second wavelength division multiplexer/demultiplexer 12, each second bidirectional optical fiber module 32 is connected with the corresponding second optical fiber 22 interface through one second optical fiber 22,
in each pair of the bidirectional optical fiber modules, the second bidirectional optical fiber module 32 corresponds to the same first channel and second channel as the first bidirectional optical fiber module 31,
when transmitting optical signals in the same channel, the receiving end and the transmitting end of the first single-fiber bidirectional optical module 31 and the second single-fiber bidirectional optical module 32 for transmitting optical signals are arranged oppositely,
the wavelengths of the transmitted optical signals are sequentially increased or decreased, the wavelength interval between two adjacent optical signals is 7nm,
the transmission rate of the optical signal in the wavelength division multiplexing system is 25 Gbps.
Since the number of the first single-fiber bidirectional optical module 31, the second single-fiber bidirectional optical module 32, the first optical fiber 21, and the second optical fiber 22 is reduced, the present embodiment saves the optical fiber interface resources disposed on the first wavelength division box and the first wavelength division box.
The present invention has been described in detail with reference to the above embodiments, but these are not to be construed as limiting the present invention. The protection scope of the present invention is not limited to the above embodiments, but equivalent modifications or changes made by those skilled in the art according to the disclosure of the present invention should be included in the protection scope of the claims.
Claims (10)
1. A wave distribution system for CWDM signal transmission, comprising:
a first wavelength division multiplexer/demultiplexer (11);
at least two first optical fibers (21); and
at least two first bidirectional optical fibre modules (31), each of said first bidirectional optical fibre modules (31) being connected to said first wavelength division multiplexer/demultiplexer (11) by one of said first optical fibres (21),
each first single-fiber bidirectional optical module (31) corresponds to a first channel and a second channel, the first channel and the second channel respectively transmit optical signals with different wavelengths, and the transmission directions of the first channel and the second channel are opposite.
2. The wave distribution system of claim 1, wherein the optical signal transmitted by the wave distribution system corresponds to a wavelength range of 1267.5nm-1374.5 nm.
3. The wave distribution system according to claim 1, wherein the number of the first bidirectional optical modules (31) is 6-12.
4. The wavelength distribution system of claim 3, wherein the wavelengths of the plurality of transmitted optical signals sequentially increase or decrease, and the wavelength interval between two adjacent optical signals is 7 nm.
5. A wavelength division multiplexing system for transmission of CWDM signals characterized in that the wavelength division multiplexing is performed using the wavelength division multiplexing system according to any of claims 1-4.
6. The WDM system according to claim 5, comprising:
the first wavelength division multiplexer/demultiplexer (11) and the second wavelength division multiplexer/demultiplexer (12) are in communication connection with each other;
a plurality of said first optical fibers (21) and a plurality of second optical fibers (22); and
at least two pairs of bidirectional optical fiber modules, each of said bidirectional optical fiber modules comprising one of said first bidirectional optical fiber modules (31) of claim 1 and one of said second bidirectional optical fiber modules (32) disposed in match with said first bidirectional optical fiber module (31), each of said first bidirectional optical fiber modules (31) being connected to said first wavelength division multiplexer/demultiplexer (11) via one of said first optical fibers (21), each of said second bidirectional optical fiber modules (32) being connected to said second wavelength division multiplexer/demultiplexer (12) via one of said second optical fibers (22);
wherein, in each pair of the single-fiber bidirectional optical modules, the second single-fiber bidirectional optical module (32) corresponds to the same first channel and second channel as the first single-fiber bidirectional optical module (31),
when transmitting optical signals in the same channel, the receiving end and the transmitting end of the first single-fiber bidirectional optical module (31) and the second single-fiber bidirectional optical module (32) for transmitting optical signals are arranged oppositely.
7. The WDM system according to claim 6, wherein the optical signal is transmitted at a rate of 25Gbps in the WDM system.
8. The WDM system of claim 6, wherein at least 24 different wavelengths of optical signals are transmitted simultaneously.
9. The WDM system of claim 6, wherein the number of channels for transmission is set to 12 during operation.
10. A wavelength division multiplexing system for CWDM signal transmission, comprising:
a first wavelength division box with a built-in first wavelength division multiplexer/demultiplexer (11) and a second wavelength division box with a built-in second wavelength division multiplexer/demultiplexer (12), wherein the first wavelength division multiplexer/demultiplexer (11) is in communication connection with the second wavelength division multiplexer/demultiplexer (12);
a plurality of first optical fibers (21) and a plurality of second optical fibers (22); and
at least two pairs of bidirectional optical single-fiber modules, each pair of bidirectional optical single-fiber modules comprising a first bidirectional optical single-fiber module (31) and a second bidirectional optical single-fiber module (32);
wherein a plurality of first optical fiber (21) interfaces matched with the first optical fibers (21) are arranged on the first wavelength division box, the first optical fiber (21) interfaces are connected with the first wavelength division multiplexer/demultiplexer (11), each first single-fiber bidirectional optical module (31) is connected with the corresponding first optical fiber (21) interface through one first optical fiber (21),
a plurality of second optical fiber (22) interfaces matched with the second optical fibers (22) are arranged on the second wavelength division box, the second optical fiber (22) interfaces are connected with the second wavelength division multiplexer/demultiplexer (12), each second single-fiber bidirectional optical module (32) is connected with the corresponding second optical fiber (22) interface through one second optical fiber (22),
in each pair of the single-fiber bidirectional optical modules, the second single-fiber bidirectional optical module (32) corresponds to the same first channel and second channel as the first single-fiber bidirectional optical module (31),
when transmitting optical signals in the same channel, the receiving end and the transmitting end of the first single-fiber bidirectional optical module (31) and the second single-fiber bidirectional optical module (32) for transmitting optical signals are arranged oppositely,
the wavelengths of the transmitted optical signals are sequentially increased or decreased, the wavelength interval between two adjacent optical signals is 7nm,
the transmission rate of the optical signal in the wavelength division multiplexing system is 25 Gbps.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115347974A (en) * | 2021-05-12 | 2022-11-15 | 希烽光电科技(南京)有限公司 | Multi-wavelength single-fiber bidirectional 400G long-distance optical communication system |
| US11683099B1 (en) | 2021-09-24 | 2023-06-20 | Cisco Technology, Inc. | Gigabit multimode bidirectional optical module |
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2019
- 2019-12-26 CN CN201922385796.8U patent/CN210839596U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115347974A (en) * | 2021-05-12 | 2022-11-15 | 希烽光电科技(南京)有限公司 | Multi-wavelength single-fiber bidirectional 400G long-distance optical communication system |
| CN115347974B (en) * | 2021-05-12 | 2024-04-09 | 希烽光电科技(南京)有限公司 | Multi-wavelength single-fiber bidirectional 400G long-distance optical communication system |
| US11683099B1 (en) | 2021-09-24 | 2023-06-20 | Cisco Technology, Inc. | Gigabit multimode bidirectional optical module |
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