KR20190048721A - Optical communication method and apparatus using wavelength tunable light source corresponding to multiple bands - Google Patents

Abstract

Disclosed are an optical communication method using a wavelength tunable light source corresponding to a plurality of bands and an apparatus thereof. According to an embodiment of the present invention, the optical communication method comprises the steps of: generating a plurality of optical signals using a plurality of tunable laser diodes (TLDs) corresponding to each of a plurality of bands; multiplexing the plurality of optical signals; and transmitting the plurality of multiplexed optical signals through a cyclic arrayed waveguide grating router.

Description

TECHNICAL FIELD [0001] The present invention relates to an optical communication method and apparatus using a wavelength-tunable light source corresponding to a plurality of bands,

The following embodiments relate to an optical communication method and apparatus using a plurality of wavelength tuning light sources.

In general, when a wavelength-controlled laser having a specific wavelength is used in a cyclic arrayed waveguide grating router to adjust the output of an input wavelength to an optical port, .

When a wavelength tunable laser is placed in each port of a cyclic arrayed waveguide router, a plurality of wavelengths can output signals input from the respective input ports without overlapping wavelengths at the respective output ports.

Each adjusted wavelength input at the input port is output only to the predetermined path of the cyclic arrayed waveguide router.

Embodiments can provide a technique of extending the transmission capacity and system capacity of an optical switching system using a wavelength tuning light source corresponding to a plurality of bands.

An optical communication method according to an embodiment includes a step of generating a plurality of optical signals using a plurality of tunable laser diodes (TLDs) corresponding to each of a plurality of bands, Multiplexing a plurality of optical signals and transmitting the multiplexed optical signals through a cyclic arrayed waveguide grating router.

The generating may include generating a plurality of optical signals having different wavelengths in respective band regions using each of the plurality of wavelength tunable lasers.

The multiplexing may include multiplexing the plurality of optical signals by a time division multiplexing method.

The transmitting may include synchronizing the multiplexed optical signals and transmitting the multiplexed optical signals through the cyclic arrayed waveguide router.

The optical communication method may further include receiving the multiplexed plurality of optical signals.

The receiving may comprise receiving the multiplexed plurality of optical signals using a single receiver or a plurality of receivers corresponding to each of the plurality of bands.

The receiving step may include demultiplexing the multiplexed optical signals to extract optical signals for respective bands by demultiplexing the demultiplexed optical signals.

The optical communication method may further include space switching the plurality of multiplexed optical signals.

An optical communication apparatus according to an exemplary embodiment includes an optical signal generator that generates a plurality of optical signals using a plurality of tunable laser diodes (TLDs) corresponding to a plurality of bands, And a multiplexer for multiplexing the plurality of optical signals and transmitting the multiplexed optical signals through a cyclic arrayed waveguide grating router.

The optical signal generator can generate a plurality of optical signals having different wavelengths in the respective band regions by using each of the plurality of wavelength tunable lasers.

The multiplexer may multiplex the plurality of optical signals in a time division multiplexing manner.

The multiplexer may synchronize the multiplexed optical signals and transmit the multiplexed optical signals through the cyclic arrayed waveguide router.

The optical communication apparatus may further include an optical signal receiving apparatus for receiving the multiplexed optical signals.

The optical signal receiving apparatus may receive the multiplexed plurality of optical signals using a single receiver or a plurality of receivers corresponding to each of the plurality of bands.

The optical signal receiving apparatus demultiplexes a plurality of multiplexed optical signals to extract optical signals for respective bands.

The optical communication apparatus may further include a spatial switch for space switching the plurality of multiplexed optical signals.

1 shows an example of a cyclic arrayed waveguide router according to an embodiment.
FIG. 2 illustrates an example of a cyclic arrayed waveguide router using a single wavelength tunable laser for each port according to an embodiment.
3 shows a schematic block diagram of an optical communication device according to an embodiment.
Fig. 4 shows an example of the structure of the optical communication apparatus shown in Fig.
5 illustrates an example of an optical communication device using one receiver per port according to one embodiment.
6 illustrates an example of an optical communication apparatus using a plurality of receivers per port according to an embodiment.
Figure 7 illustrates an example of a spatial switch according to one embodiment.
8 illustrates an example of an optical communication device using one receiver per port and including a spatial switch in accordance with one embodiment.
9 shows an example of an optical communication device using a plurality of receivers per port and including a spatial switch according to an embodiment.

It is to be understood that the specific structural or functional descriptions of embodiments of the present invention disclosed herein are presented for the purpose of describing embodiments only in accordance with the concepts of the present invention, May be embodied in various forms and are not limited to the embodiments described herein.

Embodiments in accordance with the concepts of the present invention are capable of various modifications and may take various forms, so that the embodiments are illustrated in the drawings and described in detail herein. However, it is not intended to limit the embodiments according to the concepts of the present invention to the specific disclosure forms, but includes changes, equivalents, or alternatives falling within the spirit and scope of the present invention.

The terms first, second, or the like may be used to describe various elements, but the elements should not be limited by the terms. The terms may be named for the purpose of distinguishing one element from another, for example without departing from the scope of the right according to the concept of the present invention, the first element being referred to as the second element, Similarly, the second component may also be referred to as the first component.

It is to be understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, . On the other hand, when an element is referred to as being "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between. Expressions that describe the relationship between components, for example, "between" and "immediately" or "directly adjacent to" should be interpreted as well.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In this specification, the terms " comprises ", or " having ", and the like, are used to specify one or more of the features, numbers, steps, operations, elements, But do not preclude the presence or addition of steps, operations, elements, parts, or combinations thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the meaning of the context in the relevant art and, unless explicitly defined herein, are to be interpreted as ideal or overly formal Do not.

Hereinafter, embodiments will be described in detail with reference to the accompanying drawings. However, the scope of the patent application is not limited or limited by these embodiments. Like reference symbols in the drawings denote like elements.

FIG. 1 shows an example of a cyclic arrayed waveguide router according to an embodiment, and FIG. 2 shows an example of a cyclic arrayed waveguide router using a single wavelength tunable laser for each port according to an embodiment.

1 and 2, the optical transmission apparatus multiplexes a plurality of (for example, N) wavelengths corresponding to wavelength intervals of a cyclic arrayed waveguide grating router (AWGR) And can be input to each input port of the arrayed waveguide router.

Namely, according to the light transmission characteristic of the cyclic arrayed waveguide router, the input optical fiber 1 inputs N lights having the wavelengths 1-1, 1-2, ..., 1-N, and the input optical fiber 2 enters the wavelength 2- 1, 2-2, ..., 2-N, and the input optical fiber N can input N-number of lights of wavelengths N-1, N-2, ..., N.

In this case, according to the light transmission characteristics of the cyclic arrayed waveguide router, the output optical fiber 1 outputs N lights having wavelengths 1-1, 2-2, ..., NN, and the output optical fiber 2 outputs wavelengths 2-1 N-1, N-1, N-2, ..., N-1, N-1, can do.

In each output fiber, the light from wavelengths 1 to N can be output without any overlap at the output port. When a wavelength tunable laser is used to input light into each port of a cyclic arrayed waveguide router, each output port can output a signal input from the input port without overlapping wavelengths.

3 shows a schematic block diagram of an optical communication device according to an embodiment.

Referring to FIG. 3, the optical communication device 10 can provide data network communication using light. The optical communication device 10 can provide an optical switching system using a tunable laser, a spatial switch, a cyclic arrayed waveguide router, and a receiver.

The optical communication apparatus 10 can transmit an optical signal to a destination without going through the optical / electrical conversion in the middle of the network by using the optical switching system. The optical communication device 10 can perform a switching operation in the network by assigning a specific wavelength to the optical signal.

The optical communication apparatus 10 can use a wavelength tunable laser in each band (T, O, E, S, C and L bands) per port without using only one tunable laser diode (TLD) per optical fiber port To perform optical communication.

The optical communication apparatus 10 includes an optical signal transmitting apparatus 100, a cyclic arrayed waveguide router 200, and an optical signal receiving apparatus 300.

The optical communication apparatus 10 uses the FSR (Free Spectral Range) characteristic of the cyclic arrayed waveguide router 200 to divide the output wavelength of the tunable laser in the FSR range according to each band interval, ).

The optical communication apparatus 10 may apply a plurality of wavelength tunable lasers to each port and provide wavelength space frame switching using the FSR transmission characteristics of the cyclic arrayed waveguide router 200. [

The optical communication apparatus 10 does not generate N wavelengths in the FSR region as one wavelength tunable laser but uses N (N is an integer of 2 or more) wavelengths in each band (T, O, E, S , C and L bands) can be used.

The optical communication apparatus 10 can increase the number of signals output from the output port by inputting more optical signals to the ports per band than the conventional optical communication method.

The optical communication apparatus 10 can synchronize and transmit a plurality of transmission signals generated for respective bands, and can receive optical signals classified by bands using a plurality of receivers.

The optical communication apparatus 10 can separate the signals by bands by using optical signal separators for respective bands for temporally overlapping wavelengths so that the received signals do not overlap in time.

The optical communication apparatus 10 may increase the throughput by increasing the number of wavelengths that can be received by one receiver by inputting a plurality of input wavelengths into one receiver by time division multiplexing .

In addition, the optical communication apparatus 10 uses a receiver corresponding to each band to receive a signal that is obtained by dividing all wavelengths accommodated in each band-tunable laser by band sections using a plurality of tunable lasers, It is possible to expand the switching capacity.

The optical communication apparatus 10 can secure the flexibility of data network operation by expanding the transmission capacity and the system switching capacity.

The optical signal transmission apparatus 100 can generate a plurality of optical signals and can multiplex a plurality of optical signals. The optical signal transmission apparatus 100 can output a plurality of optical signals multiplexed by the cyclic arrayed waveguide router 200.

The cyclic arrayed waveguide router 200 can output a plurality of multiplexed optical signals to an output terminal without interference between optical signals. The cyclic arrayed waveguide router 200 may include N input terminals and N output terminals. N may mean an integer of 1 or more.

The optical signal receiving apparatus 300 can receive a plurality of multiplexed optical signals output from the cyclic arrayed waveguide router 200.

Fig. 4 shows an example of the structure of the optical communication apparatus shown in Fig.

Referring to FIG. 4, the optical signal transmitting apparatus 100 may include a plurality of transmitters. The number of transmitters may be equal to the number of input ports.

The transmitter may comprise an optical signal generator 110 and a multiplexer 130.

The optical signal generator 110 may generate a plurality of optical signals using a plurality of tunable laser diodes (TLDs) corresponding to each of a plurality of bands. The band to which the tunable laser corresponds can include the T, O, E, S, C, and L bands.

The optical signal generator 110 can generate a plurality of optical signals having different wavelengths in the respective band regions by using each of the plurality of wavelength tunable lasers. The optical signal generator 110 may output a plurality of optical signals to the multiplexer 130.

The multiplexer 130 may multiplex a plurality of optical signals. The multiplexer 130 may multiplex a plurality of optical signals in a time division multiplexing manner.

The multiplexer 130 may transmit a plurality of multiplexed optical signals through the cyclic arrayed waveguide router 200. The optical signal generator 110 may synchronize a plurality of optical signals and transmit the optical signals through the multiplexer 130 and the cyclic arrayed waveguide router 200.

The optical signal receiving apparatus 300 can receive a plurality of multiplexed optical signals. The optical signal receiving apparatus 300 may include a single receiver or a plurality of receivers corresponding to each of a plurality of bands.

The optical signal receiving apparatus 300 can demultiplex a plurality of multiplexed optical signals to extract optical signals for respective bands.

The optical signal receiving apparatus 300 may include a demultiplexer 310 and a receiver 330. The demultiplexer 310 and the receiver 330 may be plural. The number of demultiplexers 310 and receivers 330 may be equal to the number of output ports.

The demultiplexer 310 demultiplexes a plurality of multiplexed optical signals. The demultiplexer 310 can extract an output signal from a plurality of multiplexed optical signals. The demultiplexer 310 demultiplexes a plurality of multiplexed optical signals, and demultiplexes the demultiplexed optical signals into bands to extract optical signals for respective bands.

The receiver 330 may receive a plurality of multiplexed optical signals output from the cyclic arrayed waveguide router 200. The receiver 330 may be used for one output port, or a receiver 330 corresponding to a plurality of bands for each output port may be used.

5 illustrates an example of an optical communication device using one receiver per port according to one embodiment.

Referring to FIG. 5, the optical signal generator 110 is a wavelength tunable laser that uses wavelength tunable laser diodes for each band, instead of taking charge of the entire wavelength band input to the cyclic arrayed waveguide router 200, A signal can be input.

For example, the optical signal generator 110 generates N optical signals in the T-band region of the first port and generates N optical signals in the O-band region, and outputs T, O, E, S, C, It is possible to generate N optical signals in each of the L band regions.

Also, the optical signal generator 110 can generate N optical signals in each of the T, O, E, S, C, and L band regions of the second port.

The optical signal generator 110 can generate N optical signals in the T, O, E, S, C, and L band regions of the first, second, ..., N ports in the above-

The multiplexer 130 may combine optical signals divided into bands and output the optical signals to the cyclic arrayed waveguide router 200. The multiplexer 130 may combine the optical signals generated at the respective ports. For example, the multiplexer 130 can multiplex a plurality of optical signals at ports 1, 2, ..., N, respectively.

The multiplexer 130 may input an optical signal coupled to one of the N port inputs of the NxN cyclic arrayed waveguide.

The cyclic arrayed waveguide router 200 can output the wavelengths divided by the band regions from Nos. 1 to N in a state where they are not overlapped on the output port.

The optical signal receiving apparatus 300 can receive a plurality of optical signals output through the cyclic arrayed waveguide router 200. When the multiplexer 130 synchronizes the wavelengths of the respective bands and transmits the optical signals, each of the output ports can receive a plurality of optical signals using one receiver 330 per output port.

As described above, the optical communication apparatus 10 can increase the throughput as compared with the case where one wavelength tunable laser is used for each port by using a wavelength tunable laser for each band. In addition, the plurality of wavelengths generated in each band region may not overlap with each other in the output port due to the characteristics of the cyclic arrayed waveguide router 200.

6 illustrates an example of an optical communication apparatus using a plurality of receivers per port according to an embodiment.

Referring to FIG. 6, the operation of the optical signal generator 110 and the multiplexer 130 may be the same as described in FIG.

The multiplexer 130 can transmit the plurality of optical signals generated for each band in synchronization with each other through the cyclic arrayed waveguide. The cyclic array waveguide can output the wavelength divided by the band region from 1 to N without overlapping at the output port.

The demultiplexer 310 demultiplexes the optical signal for each band and extracts the signal. Therefore, the optical signal receiving apparatus 300 can prevent wavelengths of other bands from overlapping with each other.

The receiver 330 may be implemented as a plurality of wavelength tunable lasers. The plurality of receivers 330 can expand the capacity of the system by receiving separated optical signals for respective bands. At this time, the capacity of the system can be increased corresponding to the number of wavelength tunable lasers used.

Figure 7 illustrates an example of a spatial switch according to one embodiment.

Referring to FIG. 7, the spatial switch may space-switch a plurality of multiplexed optical signals.

The spatial switch can perform the transmission and coupling of the optical signal. For example, the spatial switch may be a 4x4 spatial switch. The 4 × 4 spatial switch can be configured by combining four 1 × 4 switches and four 4 × 1 couplers. According to the embodiment, besides 4x4, MxM (M is an integer equal to or larger than 1) space switch can also be implemented.

The spatial switch may be located between the optical signal transmitting apparatus 100 and the cyclic arrayed waveguide router 200 or may be located between the cyclic arrayed waveguide router 200 and the optical signal receiving apparatus 300.

FIG. 8 illustrates an example of an optical communication apparatus using one receiver for each port and including a spatial switch according to an exemplary embodiment. FIG. 9 illustrates a case where a plurality of receivers are used for each port according to an embodiment, 1 shows an example of an optical communication device including

Referring to FIGS. 8 and 9, the spatial switch may be N × M (N, M is an integer greater than or equal to 2) spatial switch depending on the capacity. By adjusting the number of space switch capacities and the number of cyclic arrayed waveguide routers 200 as needed, the per-port transmission capacity and system capacity can be expanded.

At this time, the switching signal of the spatial switch can be switched in time-slot synchronized manner.

The apparatus described above may be implemented as a hardware component, a software component, and / or a combination of hardware components and software components. For example, the apparatus and components described in the embodiments may be implemented within a computer system, such as, for example, a processor, controller, arithmetic logic unit (ALU), digital signal processor, microcomputer, field programmable gate array (FPGA) , A programmable logic unit (PLU), a microprocessor, or any other device capable of executing and responding to instructions. The processing device may execute an operating system (OS) and one or more software applications running on the operating system. The processing device may also access, store, manipulate, process, and generate data in response to execution of the software. For ease of understanding, the processing apparatus may be described as being used singly, but those skilled in the art will recognize that the processing apparatus may have a plurality of processing elements and / As shown in FIG. For example, the processing apparatus may comprise a plurality of processors or one processor and one controller. Other processing configurations are also possible, such as a parallel processor.

The software may include a computer program, code, instructions, or a combination of one or more of the foregoing, and may be configured to configure the processing device to operate as desired or to process it collectively or collectively Device can be commanded. The software and / or data may be in the form of any type of machine, component, physical device, virtual equipment, computer storage media, or device , Or may be permanently or temporarily embodied in a transmitted signal wave. The software may be distributed over a networked computer system and stored or executed in a distributed manner. The software and data may be stored on one or more computer readable recording media.

The method according to an embodiment may be implemented in the form of a program command that can be executed through various computer means and recorded in a computer-readable medium. The computer-readable medium may include program instructions, data files, data structures, and the like, alone or in combination. The program instructions to be recorded on the medium may be those specially designed and configured for the embodiments or may be available to those skilled in the art of computer software. Examples of computer-readable media include magnetic media such as hard disks, floppy disks and magnetic tape; optical media such as CD-ROMs and DVDs; magnetic media such as floppy disks; Magneto-optical media, and hardware devices specifically configured to store and execute program instructions such as ROM, RAM, flash memory, and the like. Examples of program instructions include machine language code such as those produced by a compiler, as well as high-level language code that can be executed by a computer using an interpreter or the like. The hardware devices described above may be configured to operate as one or more software modules to perform the operations of the embodiments, and vice versa.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. For example, it is to be understood that the techniques described may be performed in a different order than the described methods, and / or that components of the described systems, structures, devices, circuits, Lt; / RTI > or equivalents, even if it is replaced or replaced.

Therefore, other implementations, other embodiments, and equivalents to the claims are also within the scope of the following claims.

Claims (16)

Generating a plurality of optical signals using a plurality of tunable laser diodes (TLDs) corresponding to each of a plurality of bands;
Multiplexing the plurality of optical signals; And
Transmitting a plurality of multiplexed optical signals through a cyclic arrayed waveguide grating router
And an optical communication method.
The method according to claim 1,
Wherein the generating comprises:
Generating a plurality of optical signals having different wavelengths in respective band regions by using each of the plurality of wavelength tunable lasers;
/ RTI >
The method according to claim 1,
Wherein the multiplexing comprises:
Multiplexing the plurality of optical signals by time division multiplexing
/ RTI >
The method according to claim 1,
Wherein the transmitting comprises:
Synchronizing the multiplexed optical signals and transmitting the multiplexed optical signals through the cyclic arrayed waveguide router
/ RTI >
The method according to claim 1,
Receiving the multiplexed plurality of optical signals
Further comprising the steps of:
6. The method of claim 5,
Wherein the receiving comprises:
Receiving the multiplexed plurality of optical signals using a single receiver or a plurality of receivers corresponding to each of the plurality of bands
/ RTI >
6. The method of claim 5,
Wherein the receiving comprises:
Demultiplexing the multiplexed optical signals to extract optical signals for each band by separating the optical signals by bands
/ RTI >
The method according to claim 1,
Space-switching the plurality of multiplexed optical signals;
Further comprising the steps of:
An optical signal generator for generating a plurality of optical signals using a plurality of tunable laser diodes (TLDs) corresponding to each of a plurality of bands; And
A multiplexer for multiplexing the plurality of optical signals and transmitting the multiplexed optical signals through a cyclic arrayed waveguide grating router;
And an optical communication device.
10. The method of claim 9,
Wherein the optical signal generator comprises:
A plurality of optical signals having different wavelengths in respective band regions are generated using each of the plurality of wavelength tunable lasers
Optical communication device.
10. The method of claim 9,
The multiplexer includes:
And multiplexes the plurality of optical signals in a time division multiplexing manner
Optical communication device.
10. The method of claim 9,
The multiplexer includes:
And transmits the multiplexed optical signals through the cyclic arrayed waveguide router in synchronization with each other
Optical communication device.
10. The method of claim 9,
An optical signal receiving apparatus for receiving the multiplexed optical signals
The optical communication device further comprising:
14. The method of claim 13,
The optical signal receiving apparatus includes:
A method of receiving a multiplexed plurality of optical signals using a single receiver or a plurality of receivers corresponding to each of the plurality of bands
Optical communication device.
14. The method of claim 13,
The optical signal receiving apparatus includes:
Demultiplexing the multiplexed optical signals to extract optical signals for respective bands
Optical communication device.
10. The method of claim 9,
A space switch for space switching the plurality of multiplexed optical signals;
The optical communication device further comprising:

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