KR100316855B1 - Cyclic optical cdma encoder and decoder and network using the encoder and the decoder - Google Patents

Abstract

The present invention relates to an encoder and a decoder capable of simultaneously accommodating several codes using a waveguide array lattice router (AWGR), a reflector, and an optical fiber delay line based on the cyclic characteristics of an RS code. A plurality of optical circulators for providing a plurality of input light pulses provided from the plurality of light sources to the first waveguide array grating router and outputting a plurality of encrypted light pulse strings combined from the first waveguide array grating router; Transmits multiple input light pulses provided from a plurality of different output ports, and when a plurality of light pulses reflected through the plurality of output ports are provided, the plurality of reflected light pulses are combined into a plurality of encrypted light pulse strings. And a plurality of output ports of the first waveguide array grating router and the first waveguide array grating router. A plurality of first delay lines for delaying and transmitting a number of input optical pulses with different delay times and a plurality of first optical delay lines reflected through the plurality of first delay lines are transmitted through the plurality of first delay lines. An encoder including a plurality of reflectors; A plurality of second optical circulators for receiving a plurality of light pulse trains provided from the encryptor and providing them to the second waveguide array grating router, and outputting a plurality of recovered light pulses provided from the second waveguide array grating router; A plurality of light pulse trains provided from the second optical circulator are transmitted through different output ports, and when a plurality of light pulse trains reflected through the plurality of output ports is provided, the reflected light pulse trains are transmitted to the plurality of light pulses. And a plurality of second waveguide array grating routers provided to the second optical circulator and the plurality of optical pulse strings outputted from the plurality of output ports of the second waveguide array grating router with different delay times. 2 delay lines and a plurality of input optical pulses provided through the plurality of second delay lines to reflect open and transmitted through the plurality of second delay lines It provides a decoder comprising a number of reflectors.

Description

Cyclic Optical CDM Encoder and Decoder and Optical Subscriber Network Structure Using Same {CYCLIC OPTICAL CDMA ENCODER AND DECODER AND NETWORK USING THE ENCODER AND THE DECODER}

TECHNICAL FIELD The present invention relates to an optical subscriber network, and more particularly, to an encoder and a decoder in an optical code division multiple access (OCDMA) and an optical subscriber network structure using the same.

In recent years, research on optical subscriber networks connecting optical fibers to subscriber units (or terminals) for high speed subscriber networks has been actively conducted everywhere, and in some regions, optical subscriber network for the spread of optical subscriber networks. It is built and operated.

In addition, as a multiple access method for multiple subscribers accessing the network simultaneously in such an optical subscriber network, wavelength division multiple access (WDMA), time division multiple access (TDMA), etc. have been proposed. In addition, the optical code division multiple access (OCDMA) method has been actively studied in recent years as a mixed method thereof.

The basic concept of OCDMA is similar to CDMA used in wireless communication. First, one code is given to each subscriber, and the codes are orthogonal to each other so that subscribers using different codes can access the network at the same time. do.

On the other hand, since the optical signal in the OCDMA system can not take a negative value unlike a general electrical signal, a code suitable for OCDMA having a different characteristic from the conventional CDMA is required. For this reason, various kinds of optical codes for OCDMA have been proposed at present, and most optical codes are designed to transmit signals in a combination of scattered optical pulses in the wavelength / time domain. One of these codes has been proposed a two-dimensional optical code in the wavelength / time domain generated by modifying a Reed-Solomon (RS) code.

In order to implement an OCDMA network, an encoder, which is a device for dispersing an optical signal in a wavelength and a time domain according to a given optical code, and a decoder, which is a device for collecting signals by collecting scattered optical pulses, are needed.

These coders and decoders are paired and use fiber gratings and fiber delay lines for wavelength / time domain optical codes, or use an arrayed waveguide grating multiplexor (AWGM), reflector and fiber delay lines. Can be implemented.

5A and 5B are diagrams respectively illustrating a conventional encoder and a decoder, and in particular, a block diagram showing a configuration of an encoder and a decoder using an optical fiber grating and a delay line.

First, the encryptor 110 shown in FIG. 5A includes a light emitting diode LED, an optical fiber grating FG11, FG12, FG13, ..., FG1N, a delay line DL11, DL12, ..., and a circulator C1. The decoder 120 shown in FIG. 5B includes respective optical fiber gratings FG21, FG22, FG23,..., FG2N, delay lines DL21, DL22,..., And circulator C2.

Referring to each drawing, when an optical signal pulse generated by a multi-wavelength light source or a broadband light source such as an LED is input to the input terminal In1 of the encryptor 110, each optical fiber grating FG11 is input. FG1N), the wavelength component corresponding to the reflection spectrum of the grating is reflected and other components are passed through.

In this case, since the various wavelength components of the input optical pulse are reflected at different positions, the respective wavelength components are output at different times to the output terminal Out1 of the encryptor 110 through the optical circulator C1. In this process, one input optical signal pulse having several wavelength components is encoded into a plurality of small pulse power train pulses scattered in the wavelength / time domain.

When the encrypted optical pulse train is input to the decoder 120 shown in FIG. 5B through this process, if the arrangement order of the optical fiber gratings FG21 to FG2N of the decoder 120 is opposite to the encoder 110, When the interval (delay line length) between the gratings FG21 to FG2N is properly adjusted, the pulse trains can be collected to send out a pulse having one large power to the output terminal Out2 of the reader 120.

On the other hand, if the array order of the decoders FG21 to FG2N and the lengths of the delay lines DL21, DL22, ... of the decoder 120 are not suitable for the encrypted signal, several small pulses are output instead of one large pulse. Accordingly, when a pulse of a predetermined power or more is output from the output terminal Out2 of the decryptor 120, the encrypted signal may be decrypted by judging by '1' or '0', and any other random signal which does not correspond to the given decryptor 120. The signal transmitted from the encryptor of X will only act as noise.

FIG. 6A illustrates a conventional wavelength / time domain optical code coder 210 composed of a waveguide array grating multiplexer (AWGM), an optical fiber delay line, and a reflector, and FIG. 6B illustrates a decoder 220 corresponding thereto. Figure is shown.

Referring to FIGS. 6A and 6B, optical pulses of various wavelength components generated from the LEDs of the encoder 210 and input to the AWGM1 are separated into different ports of the AWGM1 and are respectively different from the optical fiber delay lines DL11 to DL13. ) And are reflected by the respective reflectors RF11 to RF14.

The light pulses of different wavelength components reflected by the reflectors RF11 to RF14 are again output through the AWGM1 through the optical fiber delay lines DL11 to DL13 and output to the output terminal Out1 of the encryptor 210. At this time, the first input optical pulse is encrypted with the optical pulse train distributed in the wavelength / time domain as in the encryptor 110 of FIG. 5A.

Meanwhile, the operation of the decryptor 220 shown in FIG. 6B is similar to that of the encryptor 210 shown in FIG. 6A, and the same time as the pulses in which the lengths of the optical fiber delay lines DL21 to DL23 connected to the respective ports of the AWGM2 are dispersed. It must be adjusted to go out to the output terminal (Out2) of the decoder 220.

In the conventional optical encryptor and the decryptor as shown in Figures 5 and 6 there is a problem that if one subscriber wants to encrypt or decrypt several codes, he or she must have multiple encryptors and decryptors.

If one coder can encrypt several codes simultaneously or selectively, and similarly, one coder can decrypt multiple codes simultaneously or selectively, reducing the cost for the codec and decoder configuration. You will get the effect. For example, unlike the prior art in which the number of subscribers to be accommodated at the contact point between the network and the subscriber has to be provided, all the subscribers can be accommodated with only less than the number of subscribers.

Accordingly, the present invention has been devised in view of the above points, and focuses on the cyclic characteristics of the RS code, and simultaneously uses multiple waveguide grating routers (AWGRs), reflectors, and optical fiber delay lines to simultaneously code multiple codes. The goal is to provide an acceptable encryptor and decoder.

In accordance with an aspect of the present invention, there is provided a cyclic optical CD M coder and decoder of an optical subscriber system for transmitting / receiving received light in an arbitrary wavelength band provided through an optical fiber. A plurality of optical circulators for providing a plurality of input light pulses provided from the plurality of light sources to a first waveguide array grating router and outputting a plurality of encrypted light pulse strings combined from the first waveguide array grating router; The plurality of input light pulses provided from the plurality of optical circulators are transmitted through different output ports, and when the plurality of light pulses reflected through the plurality of output ports is provided, the plurality of reflected light pulses are received. The first waveguide array grating router for combining a plurality of encrypted light pulse trains; A plurality of first delay lines for delaying and transmitting the plurality of input optical pulses output from the plurality of output ports of the first waveguide array grating router with different delay times; And a plurality of reflectors reflecting the plurality of input light pulses provided through the plurality of first delay lines and transmitting through the plurality of first delay lines, wherein the decryptor comprises: the provided from the encoder; A plurality of second optical circulators for receiving a plurality of optical pulse trains and providing them to a second waveguide array grating router, and outputting a plurality of recovered optical pulses provided from the second waveguide array grating router; The plurality of light pulse trains provided from the plurality of second light circulators are transmitted through different output ports, and if the plurality of light pulse trains reflected through the plurality of output ports are provided, the reflected plurality of light pulses The second waveguide array grating router for restoring heat to the plurality of optical pulses and providing the second optical circuit to the second optical circuit; The plurality of second delay lines for delaying and outputting the plurality of optical pulse strings output from the plurality of output ports of the second waveguide array grating router with different delay times; And a plurality of reflectors reflecting the plurality of input light pulse trains provided through the plurality of second delay lines and transmitting the plurality of input delay pulse lines. Provides an encoder and a decoder.

In accordance with another aspect of the present invention, there is provided a cyclic optical CD decoder and decoder of an optical subscriber system for transmitting and receiving received light in any wavelength band provided through an optical fiber. A first optical circulator for providing an input optical pulse provided from a light source to a first optical switch and outputting an encrypted optical pulse train provided through the first optical switch; A plurality of output ports for selectively outputting the input optical pulses, transmitting the input optical pulses provided from the first optical circulator through a preselected output port of the plurality of output ports, and the preselected outputs The first optical switch providing the encrypted optical pulse train to the first optical circulator provided through a port; The input optical pulse provided from the preselected output port of the first optical switch is transmitted through a plurality of different output ports, and when a plurality of light pulses reflected through the plurality of output ports are provided, the reflected A first waveguide array grating router for combining a plurality of light pulses into the encrypted plurality of light pulse trains; A plurality of first delay lines for delaying and transmitting the plurality of input optical pulses transmitted from the plurality of output ports of the first waveguide array grating router with different delay times; And a plurality of first reflectors reflecting the plurality of input light pulses delayed through the plurality of first delay lines and outputting through the plurality of first delay lines, wherein the decryptor comprises: A second optical circulator for providing the encrypted optical pulse train to a second optical switch and outputting a recovered optical pulse provided through the second optical switch; A plurality of output ports for selectively outputting the encrypted optical pulse train provided from the second optical cycler, wherein the encrypted optical pulse train provided from the second optical cycler is output from the plurality of output ports. The second optical switch for transmitting through the selected output port and providing the restored optical pulse provided through the preselected output port to the second optical circulator; The optical pulse train, which is provided from the preselected output port of the second optical switch, is transmitted through a plurality of different output ports, and when a plurality of optical pulse trains reflected through the plurality of output ports are provided, the reflection A second waveguide array grating router configured to restore and transmit the plurality of optical pulse trains to the plurality of optical pulses; A plurality of second delay lines for delaying and transmitting the plurality of optical pulse strings output from the plurality of output ports of the second waveguide array grating router with different delay times; And a plurality of second reflectors reflecting the plurality of input light pulse trains delayed through the plurality of second delay lines and transmitting the reflected plurality of input light pulses to the second delay lines. Provide a decoder.

Still another object of the present invention is to provide an optical subscriber network structure using an encoder and a decoder capable of simultaneously receiving a plurality of codes using a waveguide array lattice router (AWGR), a reflector, and an optical fiber delay line based on the cyclic characteristics of an RS code. The purpose is to provide.

In accordance with another aspect of the present invention, there is provided a network structure of an optical subscriber system for transmitting and receiving received light having an arbitrary wavelength band provided through an optical fiber, the plurality of inputs being provided from a plurality of light sources. A plurality of optical circulators for providing optical pulses to a first waveguide array grating router and outputting a plurality of encrypted light pulse strings combined from the first waveguide array grating router; The plurality of input light pulses provided from the plurality of optical circulators are transmitted through different output ports, and when the plurality of light pulses reflected through the plurality of output ports is provided, the plurality of reflected light pulses are received. The first waveguide array grating router for combining an encrypted plurality of optical pulse trains; A plurality of first delay lines for delaying and transmitting the plurality of input optical pulses output from the plurality of output ports of the first waveguide array grating router with different delay times; An encryptor including a plurality of reflectors reflecting the plurality of input light pulses provided through the plurality of first delay lines and transmitting through the plurality of first delay lines, and the plurality of light pulses output from the encryptor A plurality of second optical circulators that receive heat and provide it to a second waveguide array grating router and output a plurality of recovered light pulses provided from the second waveguide array grating router; The plurality of light pulse trains provided from the plurality of second light circulators are transmitted through different output ports, and if the plurality of light pulse trains reflected through the plurality of output ports are provided, the reflected plurality of light pulses The second waveguide array grating router for restoring heat to the plurality of optical pulses and providing the second optical circuit to the second optical circuit; The plurality of second delay lines for delaying and outputting the plurality of optical pulse strings output from the plurality of output ports of the second waveguide array grating router with different delay times; A plurality of decryptors including a plurality of reflectors reflecting the plurality of input light pulse trains provided through the plurality of second delay lines and transmitting through the plurality of second delay lines; And an optical constellation combiner for selectively transmitting the plurality of optical pulse trains encrypted through the encryptor to respective corresponding ones of the plurality of decryptors.

In accordance with another aspect of the present invention, there is provided a network structure of an optical subscriber system for transmitting and receiving received light of an arbitrary wavelength band provided through an optical fiber, wherein the input optical pulse provided from a light source is eliminated. A first optical circulator providing a first optical switch and outputting an encrypted optical pulse train provided through the first optical switch; A plurality of output ports for selectively outputting the input optical pulses, transmitting the input optical pulses provided from the first optical circulator through a preselected output port of the plurality of output ports, and the preselected outputs The first optical switch providing the encrypted optical pulse train to the first optical circulator provided through a port; The input optical pulse provided from the preselected output port of the first optical switch is transmitted through a plurality of different output ports, and when a plurality of light pulses reflected through the plurality of output ports are provided, the reflected A first waveguide array grating router for combining a plurality of light pulses into the encrypted plurality of light pulse trains; A plurality of first delay lines for delaying and transmitting the plurality of input optical pulses transmitted from the plurality of output ports of the first waveguide array grating router with different delay times; An encryptor including a plurality of first reflectors reflecting the plurality of input light pulses delayed through the plurality of first delay lines and outputting through the plurality of first delay lines, and the encrypted light provided from the encryptor A second optical circulator for providing a pulse train to a second optical switch and outputting a recovered optical pulse provided through the second optical switch; A plurality of output ports for selectively outputting the encrypted optical pulse train provided from the second optical cycler, wherein the encrypted optical pulse train provided from the second optical cycler is output from the plurality of output ports. The second optical switch for transmitting through the selected output port and providing the restored optical pulse provided through the preselected output port to the second optical circulator; The optical pulse train, which is provided from the preselected output port of the second optical switch, is transmitted through a plurality of different output ports, and when a plurality of optical pulse trains reflected through the plurality of output ports are provided, the reflection A second waveguide array grating router configured to restore and transmit the plurality of optical pulse trains to the plurality of optical pulses; A plurality of second delay lines for delaying and transmitting the plurality of optical pulse strings output from the plurality of output ports of the second waveguide array grating router with different delay times; A plurality of decryptors including a plurality of second reflectors reflecting the plurality of input light pulse trains delayed through the plurality of second delay lines and transmitting the reflected plurality of input light pulses to the second delay lines; And an optical constellation combiner for selectively transmitting the plurality of optical pulse trains encrypted through the encryptor to respective corresponding ones of the plurality of decryptors.

1A and 1B show a cyclic optical CDMA encryptor and a decoder, respectively, according to an embodiment of the present invention;

2A and 2B illustrate a configuration of an optical CDMA encryptor and a decryptor according to another embodiment of the present invention;

3 is a diagram showing the structure of an optical subscriber network composed of the encryptor, decoder and star coupler shown in FIGS. 1A and 1B;

4 is a diagram exemplarily illustrating a configuration of an optical subscriber broadcasting network configured by using an encryptor and a decoder illustrated in FIGS. 2A and 2B;

5A and 5B show each of these conventional encoders and decryptors,

6A and 6B illustrate a conventional wavelength / time domain optical code coder and decoder comprised of a waveguide array grating multiplexer (AWGM) and an optical fiber delay line and reflector.

<Description of the code | symbol about the principal part of drawing>

L11, L12,... , L15, L21, L22,... , L25: Light emitting diode (LED)

C11, C12,... , C15, C21, C22,... , C25: Optical Circulator

AWGR1, AWGR2: first and second waveguide grating router

DL11, DL12,... , DL15, DL21, DL22,... , DL25: delay line

RF11, RF12,... , RF15, RF21, RF22,... RF25: Reflector

The above and other objects and various advantages of the present invention will become more apparent from the preferred embodiments of the present invention described below with reference to the accompanying drawings by those skilled in the art.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1A and 1B are diagrams illustrating a cyclic optical CDMA encryptor and a decoder, respectively, according to a preferred embodiment of the present invention. The encryptor shown in FIG. 1A corresponds to a plurality of LEDs L11 to L15 in a one-to-one correspondence. Circulators C11 to C15, a first waveguide array grating router AWGR1, delay lines DL11 to DL13, and reflectors RF11 to RF14, and the decoder shown in FIG. 1B includes a plurality of circulators C21 to C25. And a second waveguide array grating router AWGR2, delay lines DL21 to DL23, and reflectors RF21 to RF24.

First, referring to FIG. 1A, an optical CDMA encryptor according to the present invention will be described. The AWGR1 functions as a collection of a plurality of AWGMs. That is, when light of various wavelengths is incident on one input port of the AWGR1, the AWGR1 separates the wavelength by each wavelength and outputs it to different output ports.

Then, when light of the same wavelength component is incident on different input ports of AWGR1, each wavelength component is separated into a different output port than before. That is, in AWGR1, the output port separated by wavelength varies depending on the wavelength component and the input port of the input light. In this case, the change of the output port according to the input port for the same wavelength component exhibits a cyclic characteristic.

For example, if light of a wavelength component of λ is incident on any input port i of AWGR1 and output to output port j, light of the same wavelength component is incident to input port i + d (mod N) to output port jd ( output as mod N) Where N is the number of input ports of AWGR1 and mod N is the modulo N operation.

Meanwhile, the encryptor of FIG. 1A utilizes the cyclic characteristics of the AWGR1 (shown in FIG. 6) and the two-dimensional RS (Reed-Solomon) optical code described above. In addition, different optical codes, i.e., pulse trains distributed in different forms in the wavelength / time domain, are obtained with optical pulses of the same wavelength component and depending on the input port of AWGR1. In other words, one encoder can encrypt with as many different codes as the number of ports in AWGR1. This is because, as described above, the cyclic characteristics of the AWGR1 depend on which input port of the AWGR1 the length of the optical fiber delay lines DL11-DL13 that each wavelength component experiences in the encoder.

At this time, different codes are required to be orthogonal to each other. To satisfy this, the optical code itself must have a cyclical characteristic. Therefore, the encoder structure as shown in FIG. 1A is applied to an optical network based on an RS optical code. Suitable.

However, if all transmissions in the network are synchronized to one system clock, a synchronous network may be implemented based on a prime optical code in addition to the RS optical code.

Meanwhile, the decryptor shown in FIG. 1B can decrypt various encrypted codes according to the input port of the AWGR2 in the same principle as the encryptor of FIG. 1A. For example, if a pair of encryptors and decryptors are encrypted using the input port i of AWGR1 included in the encryptor, the decryptor must use the input port i of AWGR2 to decrypt.

The encoder and decoder shown in Figs. 1A and 1B are based on an RS optical code based on the number of input ports of AWGR1 and AWGR2, that is, five wavelength divisions and five time divisions. Describing the decoder structure, one of the five output ports of AWGR1 and AWGR2 has no delay line and reflector, which means that the wavelength component separated by that port is not used in the coded pulse train. Is caused.

2A and 2B are diagrams illustrating a configuration of an optical CDMA encryptor and a decryptor according to another embodiment of the present invention, wherein the encryptor and the decryptor as shown in FIGS. 1A and 1B are provided together with an optical switch. FIG. 1 is a diagram illustrating a configuration of an encryptor and a decryptor capable of selectively transmitting or receiving (decrypting) multiple ciphers.

First, the encryptor shown in FIG. 2A includes an optical circulator C1, an optical switch 21, a waveguide array grating router AWGR1, delay lines DL11 to DL13, reflectors RF11 to RF14, and the decryptor The circulator C2, the optical switch 22, the waveguide array grating router AWGR2, and the respective delay lines DL21 to DL23 and the reflectors RF21 to 24 are included.

On the other hand, the overall operation of the encryptor and the decryptor shown in Figures 2a and 2b is the same as the operation of the encryptor and the decryptor shown in Figures 1a and 1b. However, the encryptor and the decryptor shown in Figs. 2A and 2B allow the subscriber to selectively transmit and receive several encrypted light pulses by operating the optical switch 21.

In other words, each of the optical switches 21 and 22 included in the optical encryptor and the decoder illustrated in FIGS. 2A and 2B generates a plurality of optical signals generated from light sources not shown and input through the respective input terminals In1 and In2. The output port is selectively output to any output port selected according to the user's operation. In the case of using an encryptor and a decryptor as shown in FIGS. 2A and 2B, five types of codes can be encrypted or decrypted.

FIG. 3 is a diagram showing the structure of an optical subscriber network composed of the encryptor, decoder and star coupler shown in FIG. 1, wherein one encoder 310, a star coupler and a plurality of decoders are shown. (320, 330, ..., 360).

First, FIG. 1 is a diagram illustrating an optical subscriber network configured to accommodate five subscribers using only one encryptor as shown, and the encryptor 310 includes a plurality of encoders as shown in FIG. 1A. LED light source, a plurality of circulators C311 to C315, a waveguide array lattice router AWGR1, and a plurality of delay lines DL311 to DL313. The operation of the encryptor 310 is the same as that of the encryptor of FIG. 1A described above.

In addition, the plurality of decoders 320 to 360 shown in the same drawing are shown in FIG. 1B, respectively, as shown in FIG. And DL331 to DL333, DL341 to DL343, DL351 to 353, and DL361 to 363. At this time, each of the decoders 320 to 360 receives an optical signal from the optical constellation combiner 315 through different input ports.

In detail, the transmission destination (subscriber) is determined according to which input port of the AWGR1 is input from the one encryptor 310 shown in FIG. At this time, the same signal is transmitted to the subscribers other than the intended subscriber by the constellation combiner 315, but acts as noise only by the operation principle of the conventional general decoder (FIG. 5B) described above.

In addition, the optical subscriber network structure as shown in FIG. 3 can be extended to a network that accommodates more subscribers by increasing the number of wavelength divisions and the number of time divisions.

FIG. 4 exemplarily illustrates a configuration of an optical subscriber network configured by using the encryptor shown in FIG. 2A and the decryptor shown in FIG. 2B, that is, an encoder and an decoder including an optical switch and a waveguide array lattice router. As shown in the figure, it includes one encoder 410, an optical concatemer 415, and a plurality of decoders 420-1, ..., 420-n.

First, as shown in FIG. 2A, the encryptor 410 shown in FIG. 2A includes a plurality of LED light sources, a plurality of circulators C411 to C415, a waveguide array lattice router AWGR1, and a plurality of delay lines DL411 to DL413. It is configured to include. The operation of the encryptor 310 is the same as that of the encryptor of FIG. 1A described above.

In addition, each of the decoders 420-1, ..., 420-n shown in the same figure is shown in FIG. 1B, respectively, as shown in FIG. 1B, and the circulators C420-1, ..., 420-n, the optical switch S420-1, ..., S420-n), waveguide array lattice routers (AWGR2 to AWGRn), and a plurality of delay lines (DL1-1 to DL1-3, ..., DLn-1, ..., DLn-3). The operation of each of the decoders 420-1, ..., 420-n shown is the same as that of the decoder shown in FIG. 2B.

In the case of using an optical subscriber network composed of an encoder and a decoder including such an optical switch and a waveguide array lattice router, information encrypted with five different optical codes is broadcast to all the subscribers. Each subscriber can selectively receive the desired information among them by operating the optical switches S420-1, ..., S420-n.

That is, in the optical subscriber network structure as shown in FIG. 4, one optical code means one broadcast channel. In order to increase the number of broadcast channels in the optical subscriber network structure, the number of wavelength divisions or the time is same as in FIG. This is possible by increasing the number of divisions.

As described above, according to the present invention, it is possible to generate or decrypt various different encrypted optical signals using only one encoder or decoder using the cyclic characteristics of the waveguide array lattice router (AWGR) and the RS code. When constructing an optical subscriber network using such an encryptor and a decryptor, there is an effect that can reduce the cost for network construction.

Claims (4)

In a cyclic optical CDM encryptor and decoder of an optical subscriber system for transmitting and receiving received light of any wavelength band provided through an optical fiber, The encryptor is: A plurality of optical circulators for providing a plurality of input light pulses provided from the plurality of light sources to a first waveguide array grating router and outputting a plurality of encrypted light pulse strings combined from the first waveguide array grating router; The plurality of input light pulses provided from the plurality of optical circulators are transmitted through different output ports, and when the plurality of light pulses reflected through the plurality of output ports is provided, the plurality of reflected light pulses are received. The first waveguide array grating router for combining a plurality of encrypted light pulse trains; A plurality of first delay lines for delaying and transmitting the plurality of input optical pulses output from the plurality of output ports of the first waveguide array grating router with different delay times; And a plurality of reflectors reflecting the plurality of input light pulses provided through the plurality of first delay lines and transmitting the plurality of input light pulses through the plurality of first delay lines. The decryptor is: A plurality of second optical circulators that receive the plurality of optical pulse trains provided from the encryptor and provide them to a second waveguide array grating router, and output a plurality of recovered light pulses provided from the second waveguide array grating router; The plurality of light pulse trains provided from the plurality of second light circulators are transmitted through different output ports, and if the plurality of light pulse trains reflected through the plurality of output ports are provided, the reflected plurality of light pulses The second waveguide array grating router for restoring heat to the plurality of optical pulses and providing the second optical circuit to the second optical circuit; The plurality of second delay lines for delaying and outputting the plurality of optical pulse strings output from the plurality of output ports of the second waveguide array grating router with different delay times; And a plurality of reflectors reflecting the plurality of input light pulse trains provided through the plurality of second delay lines and transmitting the plurality of input delay pulse lines. Encoder and Decoder. In the network structure of an optical subscriber system for transmitting and receiving received light of any wavelength band provided through an optical fiber, A plurality of optical circulators for providing a plurality of input light pulses provided from the plurality of light sources to a first waveguide array grating router and outputting a plurality of encrypted light pulse strings combined from the first waveguide array grating router; The plurality of input light pulses provided from the plurality of optical circulators are transmitted through different output ports, and when the plurality of light pulses reflected through the plurality of output ports is provided, the plurality of reflected light pulses are received. The first waveguide array grating router for combining a plurality of encrypted light pulse trains; A plurality of first delay lines for delaying and transmitting the plurality of input optical pulses output from the plurality of output ports of the first waveguide array grating router with different delay times; An encoder comprising a plurality of reflectors reflecting the plurality of input light pulses provided through the plurality of first delay lines and transmitting the plurality of input light pulses through the plurality of first delay lines; A plurality of second optical circulators for receiving the plurality of light pulse strings output from the encryptor and providing them to a second waveguide array grating router, and outputting a plurality of recovered light pulses provided from the second waveguide array grating router; The plurality of light pulse trains provided from the plurality of second light circulators are transmitted through different output ports, and if the plurality of light pulse trains reflected through the plurality of output ports are provided, the reflected plurality of light pulses The second waveguide array grating router for restoring heat to the plurality of optical pulses and providing the second optical circuit to the second optical circuit; The plurality of second delay lines for delaying and outputting the plurality of optical pulse strings output from the plurality of output ports of the second waveguide array grating router with different delay times; A plurality of decoders including a plurality of reflectors reflecting the plurality of input light pulse trains provided through the plurality of second delay lines and transmitting through the plurality of second delay lines; An optical subscriber network structure comprising an optical constellation combiner for interconnecting said encryptor with said plurality of decryptors and for selectively transmitting said plurality of optical pulse sequences encrypted through said encryptor to respective ones of said plurality of decryptors; . In a cyclic optical CDM encryptor and decoder of an optical subscriber system for transmitting and receiving received light of any wavelength band provided through an optical fiber, The encryptor is: A first optical circulator for providing an input optical pulse provided from a light source to a first optical switch and outputting an encrypted optical pulse train provided through the first optical switch; A plurality of output ports for selectively outputting the input optical pulses, transmitting the input optical pulses provided from the first optical circulator through a preselected output port of the plurality of output ports, and the preselected outputs The first optical switch providing the encrypted optical pulse train to the first optical circulator provided through a port; The input optical pulse provided from the preselected output port of the first optical switch is transmitted through a plurality of different output ports, and when a plurality of light pulses reflected through the plurality of output ports are provided, the reflected A first waveguide array grating router for combining a plurality of light pulses into the encrypted plurality of light pulse trains; A plurality of first delay lines for delaying and transmitting the plurality of input optical pulses transmitted from the plurality of output ports of the first waveguide array grating router with different delay times; And a plurality of first reflectors reflecting the plurality of input light pulses delayed through the plurality of first delay lines to output through the plurality of first delay lines. The decryptor is: A second optical circulator for providing the encrypted optical pulse train provided from the encryptor to a second optical switch and outputting a recovered optical pulse provided through the second optical switch; A plurality of output ports for selectively outputting the encrypted optical pulse train provided from the second optical cycler, wherein the encrypted optical pulse train provided from the second optical cycler is output from the plurality of output ports. The second optical switch for transmitting through the selected output port and providing the restored optical pulse provided through the preselected output port to the second optical circulator; The optical pulse train, which is provided from the preselected output port of the second optical switch, is transmitted through a plurality of different output ports, and when a plurality of optical pulse trains reflected through the plurality of output ports are provided, the reflection A second waveguide array grating router configured to restore and transmit the plurality of optical pulse trains to the plurality of optical pulses; A plurality of second delay lines for delaying and transmitting the plurality of optical pulse strings output from the plurality of output ports of the second waveguide array grating router with different delay times; And a plurality of second reflectors reflecting the plurality of input light pulse trains delayed through the plurality of second delay lines and transmitting the reflected plurality of input light pulses to the second delay lines. Decryptor. In the network structure of an optical subscriber system for transmitting and receiving received light of any wavelength band provided through an optical fiber, A first optical circulator for providing an input optical pulse provided from a light source to a first optical switch and outputting an encrypted optical pulse train provided through the first optical switch; A plurality of output ports for selectively outputting the input optical pulses, transmitting the input optical pulses provided from the first optical circulator through a preselected output port of the plurality of output ports, and the preselected outputs The first optical switch providing the encrypted optical pulse train to the first optical circulator provided through a port; The input optical pulse provided from the preselected output port of the first optical switch is transmitted through a plurality of different output ports, and when a plurality of light pulses reflected through the plurality of output ports are provided, the reflected A first waveguide array grating router for combining a plurality of light pulses into the encrypted plurality of light pulse trains; A plurality of first delay lines for delaying and transmitting the plurality of input optical pulses transmitted from the plurality of output ports of the first waveguide array grating router with different delay times; An encoder including a plurality of first reflectors reflecting the plurality of input light pulses delayed through the plurality of first delay lines and outputting the plurality of input light pulses through the plurality of first delay lines; A second optical circulator for providing the encrypted optical pulse train provided from the encryptor to a second optical switch and outputting a recovered optical pulse provided through the second optical switch; A plurality of output ports for selectively outputting the encrypted optical pulse train provided from the second optical cycler, wherein the encrypted optical pulse train provided from the second optical cycler is output from the plurality of output ports. The second optical switch for transmitting through the selected output port and providing the restored optical pulse provided through the preselected output port to the second optical circulator; The optical pulse train, which is provided from the preselected output port of the second optical switch, is transmitted through a plurality of different output ports, and when a plurality of optical pulse trains reflected through the plurality of output ports are provided, the reflection A second waveguide array grating router configured to restore and transmit the plurality of optical pulse trains to the plurality of optical pulses; A plurality of second delay lines for delaying and transmitting the plurality of optical pulse strings output from the plurality of output ports of the second waveguide array grating router with different delay times; A plurality of decoders including a plurality of second reflectors reflecting the plurality of input optical pulse trains delayed through the plurality of second delay lines and transmitting the reflected plurality of input light pulses to the second delay lines; An optical subscriber network structure comprising an optical constellation combiner for interconnecting said encryptor and said plurality of decryptors and for selectively transmitting said plurality of light pulse sequences encrypted through said encryptor to respective ones of said plurality of decryptors; .