KR100377456B1 - All optical serial-parallel data format converter using SLALOM - Google Patents

Abstract

The present invention is an all-optical serial-to-parallel data format converter and an all-optical parallel-to-serial data format for the realization of ultra-fast optical transmission, optical exchange, optical signal processing, and optical computer devices combining wavelength division multiplexing and all-optical signal processing. The present invention relates to a serial / parallel data format conversion device that realizes conversion by applying a SLALOM (semicondutor laser amplifier in a loop mirror).

In particular, the all-optical serial-to-parallel data format conversion device significantly reduces the number of optical elements required for implementation by utilizing delay and multiplexing / demultiplexing and signal processing techniques of multi-wavelength clock signals. All-optical parallel-to-serial data format conversion device uses a single wavelength or multi-wavelength clock signal delay and all-optical signal processing technique to convert the optical signal data inputted in parallel to the optical signal in series. By converting the data into data, there is a very good effect of converting the data into a high speed and efficient data format in comparison with the conventional serial data format converter.

Description

All-optical serial / parallel data format converter using SLALOM {All optical serial-parallel data format converter using SLALOM}

The present invention relates to a data format converter for outputting serial data as parallel data for efficient data processing in an optical signal processing apparatus, and a data format converter for format converting parallel input data to serial output data. All-optical implementation of serial data signals in parallel data or parallel data in serial data can be composed of as few elements as possible, and also by non-electric all-optical processing. It is related with the apparatus which improved the processing speed.

As multimedia communication based on signal processing such as image, voice, video, and data has evolved and the number of users using information through the Internet has increased, the amount of information to be processed in the main communication network is expected to be more than several Tbps in the near future. In addition, in order to process various functions using a single computer and the implementation of video conferencing, video telephony, mobile video terminal, etc. to be implemented in the future, the user's computer is also expected to be high speed. In order to process the introduction of the all-optical signal processing technique that can overcome the limitations of the electrical signal is essential.

Currently, research on optical computers is being conducted in major countries of the world, but the results are still insufficient for practical use, and the research on all-optical serial / parallel data format converters, which are expected to be used when optical computers are implemented, is still in progress. It is not active and is still incomplete, as research has been published on the implementation of data format converters from all-optical serial to parallel.

Conventional serial-to-parallel and parallel-to-serial data format converters are electrically implemented devices, and most of them are semiconductor devices, and recently, optically-optical serial-to-parallel data format converters have been proposed. Most of the conventional techniques have been capable of high-speed operation of converting 100Gb / s high-speed data into 8 channels of parallel data using a LiNbO ₃ modulator.

This prior art is not a data format converter from a complete all-optical series to parallel, requires the need for electrical control or clock signals to drive the LiNbO ₃ modulator, and the use of LiNbO ₃ and other electronic semiconductor devices to reduce the potential According to the change, the bias is unstable and there is a problem of limiting further speed processing, and the number of devices used when the number of input or output channels increases.

In order to solve the above problems, the present invention provides a non-linear optical signal for data type conversion from all-optical serial to parallel and data type conversion from all-optical parallel to serial that enables high-speed operation while significantly reducing the number of optical elements required. The purpose of the present invention is to provide an all-optical serial / parallel data conversion device using a SLALOM (semiconductor laser amplifier in a loop mirror).

The present invention for achieving the above object is an optical fiber delay line for delaying the input clock pulses by an integer multiple of the bit period T _b ; A wavelength multiplexer for multiplexing the multi-wavelength signal past the optical fiber delay line; An optical coupler 1 constituting the loop, and an optical coupler 2 for inputting input serial data into the loop; A semiconductor optical amplifier for changing a phase of the input clock pulses by the input serial data; An optical fiber constituting a loop; A wavelength demultiplexer for demultiplexing wavelengths in the signal output from the loop; An optical-type delay line having an integer multiple of a time delay of T _b for simultaneously outputting the output data of the wavelength demultiplexer; an optical fiber delay line for delaying time by an integer multiple of _b ; An Nx1 optical coupler for coupling the time delayed parallel data; 50: 50 optocouplers 1 and 50 to form a loop; A 50:50 optocoupler 2 for coupling the parallel data in a loop; A semiconductor optical amplifier causing a phase change to a serial clock signal input by the parallel data signal; The object of the present invention has been achieved by providing an apparatus for converting an all-optical parallel to serial data format including a wide band pass filter for passing only serial data in an output signal.

1 is a block diagram showing an apparatus for converting a data format from all-optical serial to parallel according to a preferred embodiment of the present invention;

2 is an exemplary view showing an operating state of an apparatus for converting a data format from all-optical serial to parallel according to a preferred embodiment of the present invention;

3 is a block diagram showing an apparatus for converting a data format from all-optical parallel to serial according to a preferred embodiment of the present invention;

4 is an exemplary diagram showing an operating state of an apparatus for converting a data format from an all-optical parallel to a serial according to a preferred embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

1: optical fiber delay line 2: wavelength multiplexer

3: Input port of optical coupler 1 4: Optical coupler 1

5: serial data input port 6: parallel clock input port

7 converted parallel data output port 8 optical coupler 2

9: semiconductor optical amplifier 10: loop

11: output port of optocoupler 1 12: wavelength demultiplexer

13: optical fiber delay line

14: Distance of semiconductor optical amplification period from loop center point

15: loop center point

16: Bit 1 of the first serial data

17: Bit 1 of the second serial data

18: Bit 3 of the first serial data

19: Bit 4 of the first serial data

20: bit period T _b 21: serial data period T _d

22: Clock 1 bit of parallel data D1

23: Clock bit 2 of parallel data D1

24: Clock 1 bit of parallel data D2

25: Clock 1 bit of parallel data D3

26: Clock bit 1 of parallel data Dn

27 bit 1 of the wavelength multiplexer output

28: bit 2 of the wavelength multiplexer output

29: Bit 3 of the wavelength multiplexer output

30: bit n of the wavelength multiplexer output

31: Bit 1 of the wavelength demultiplexer input

32: Bit 3 of the wavelength demultiplexer input

33: Bit 1 of output parallel data D1

34: Bit 1 of output parallel data D2

35: Bit 1 of output parallel data D3

36: Bit 1 of output parallel data Dn

37: parallel data input port 38: serial clock signal input port

39: serial data output port 40: optical fiber delay line

41: optocoupler 1 42: optocoupler 2

43: Optical Coupler 3 44: Semiconductor Optical Amplifier

45: Distance of semiconductor optical amplification period from loop center point

46: loop center point 47: loop

48: wide bandpass filter

49: Bit 1 of input parallel data D1

50: Bit 1 of input parallel data D2

51: bit 1 of input parallel data D3

52: Bit 1 of input parallel data Dn

53: Bit 1 of serially aligned parallel data D1

54: Bit 1 of serially aligned parallel data D2

55: Bit 1 of serially aligned parallel data D3

56: Bit 1 of serially aligned parallel data Dn

57: bit 1 of the serial clock signal

58: bit 2 of the serial clock signal

59: Bit 1 of output serial data

60: bit 3 of the output serial data

61: bit 4 of the output serial data

62: Bit 1 of output second serial data

63: bit period T _b 64: serial data period T _d

Hereinafter, the configuration and operation of the present invention will be described in detail with reference to the accompanying drawings through preferred embodiments.

1, the data format conversion device in the front light of the present invention in series in parallel to delay the time to an integer multiple of the bit period of the parallel clock signal input to the optical fiber delay line T _b (1) and;

A wavelength multiplexer (2) for wavelength multiplexing the delayed parallel clock signal;

An input port (3) of optocoupler 1 for inputting the output of the wavelength multiplexer into a loop;

A 50:50 optocoupler 1 (4) for inputting the signal of the input port (3) to the loop;

A serial data input port 5 to which serial data is input;

An optocoupler 2 (8) coupled in a loop for the input serial data to be used as a control signal;

A semiconductor optical amplifier (9) for causing a phase change in an input clock signal by the control signal;

A loop 10 composed of an optical fiber 10;

An output port (11) of optical coupler 1 connecting the output of the loop and the wavelength demultiplexer;

A wavelength demultiplexer (12) for separating the parallel data by wavelength demultiplexing the output parallel data;

And an optical fiber delay line 13 for delaying time to simultaneously output the separated parallel data.

Hereinafter, the operation principle of the data format conversion device in the all-optical serial to parallel configuration as described above will be described in detail with reference to Figs.

First, Figure 2 is an exemplary diagram for explaining the operating principle of the data format conversion device in the all-optical serial to parallel of the present invention, Figure 2a is a signal waveform diagram showing a serial data input signal, Figure 2b is a parallel clock signal 2C is a signal waveform diagram showing an output signal of the wavelength multiplexer, FIG. 2D is a signal waveform diagram showing an input signal of the wavelength demultiplexer, and FIG. 2E is a parallel data output signal. A signal waveform diagram is shown.

Clock bits 22, 24, 25, and 26 of parallel data having a data rate of 1 / T _d (21) are input to the parallel clock input port 6 to delay the time by an integer multiple of T _b respectively. Each of the parallel clock bits 22, 24, 25, and 26, passed through (1) and delayed, is wavelength multiplexed in the wavelength multiplexer 2 so that clock 1 bit 22 of wavelength λ ₁ Bit 1 of 27, clock bit 1 of wavelength λ ₂ is bit ₂ of the wavelength multiplexer output, and bit 1 clock 25 of wavelength λ ₃ is of the wavelength multiplexer output. Bit 3, the clock first bit 26 of wavelength λ _n is delayed into bit 30 of the wavelength multiplexer output, respectively, and is input to the input port 3 of optocoupler 1 to optocoupler 1 Pass (4) and proceed to loop at 50:50. At this time, the clock signals input to the loop proceed by dividing the inside of the loop into clockwise and counterclockwise directions, respectively.

On the other hand, the serial data is input to the serial data input port (5) is coupled to the loop through the 50:50 optical coupler 2 (8) and then loops like optical clock signals proceeding clockwise. At this time, the time interval between the first serial data bit 1 (16) and the second serial data bit 1 (17) is the serial data period T _d (21), and the serial data rate is bit 3 of the first serial data. It can be written as the inverse 1 / T _b of the bit period T _b (20), which is the time interval between two adjacent bits, such as (18) and bit 4 of the first serial data (19).

In addition, the parallel clock signals traveling in the clockwise and counterclockwise directions inside the loop 10 are processed in the opposite direction to each other when there is no serial data (control signal). Is outputted to the input port 3 of the semiconductor optical amplifier 9 in the case where there is serial data, i.e., the first bit 16 and the third bit 18 of the serial data have pulses. ), The output of the optical coupler 1 (4) is caused by the interference between the clock pulse signal which is not affected by the serial data signal and the clock pulse signal which is affected by the clockwise signal. The parallel clock pulses 27 and 29 wavelength-converted to the port 11 are output as bits 31 and 32.

The outputted parallel data are separated by the wavelength by the wavelength demultiplexer 12 and then passed through the optical fiber delay line 13 to the parallel data output bits 33, 34, 35, and 36, respectively. Outputs to (7).

The all-optical serial-to-parallel data type conversion device operated as described above is composed of optical elements that are significantly reduced compared to the conventional devices, and has a feature in that the performance of the device is improved because it operates in all-optical light.

On the other hand, as shown in Figure 3, the all-optical parallel to serial data conversion apparatus of the present invention includes an optical fiber delay line 40 for delaying the time of the input parallel data by an integer multiple of the bit period T _b ;

A parallel data input port 37;

A serial clock signal input port 38;

A serial data output port 39 serially converted;

An Nx1 optical coupler 3 (43) for combining the time delayed parallel data;

Optical coupler 2 (42) for combining the aligned parallel data in a loop;

An optical coupler 1 (41) for inputting an input serial clock signal into a loop;

A semiconductor optical amplifier (44) for causing a phase change in the serial clock signal input by the parallel data signal;

A loop 47 composed of an optical fiber;

The optical bandpass filter 48 which passes only a serial data wavelength is comprised.

Hereinafter, the operation principle of the data format conversion device in the all-optical parallel to the serial configuration as described above will be described in detail with reference to FIGS.

4 is an exemplary diagram for explaining the operation principle of the data format conversion device in the all-optical parallel to serial of the present invention, Figure 4a is a signal waveform diagram showing a parallel data input signal, Figure 4b is an output signal of the coupler 3 4C is a signal waveform diagram showing a serial clock signal, and FIG. 4D is a signal waveform diagram showing a serial data output signal.

The bits 49, 50, 51, and 52 of the parallel data input to the parallel data input port 37 are delayed by an integer multiple of the bit period T _b in the optical fiber delay line 40, and then Nx1 optical coupler 3 (43). The bits 53, 54, 55, 56 of parallel data combined and serially aligned at are input into loop 47 through optocoupler 2 42.

On the other hand, when the serial clock signal input to the serial clock signal input port 38 is input to the loop 47 through the 50:50 optocoupler 1 (41), the serial clock signal is divided at a ratio of 50:50 and clockwise and counterclockwise, respectively. Proceed to At this time, the serial clock signal traveling in the clockwise direction overlaps with the serially aligned parallel data signal input through the 50:50 optocoupler 2 42 and proceeds in the clockwise direction.

The parallel data signal aligned in series with the clockwise serial clock signal passes through the semiconductor optical amplifier 44. At this time, the carrier density change occurs due to the parallel data signal, and therefore, the phase difference of the serial data signal running in the clockwise direction is generated by 180 degrees. That is, the first bit 57 of the serial clock signal causes a phase change by the first bit 53 of the parallel data D1, and the optical coupler 1 41 causes the interference between the clockwise progression signal and the counterclockwise progression signal. Bit 1 of the serial clock signal 57 is output to the right of the optocoupler 1 41. On the other hand, in the case of bit 54 of the serially aligned parallel data D2, since there is no pulse, the serial clock bit 58 does not affect the serial clock bit 58, so that the serial clock bit 58 and the clockwise progress signal are counterclockwise. It is output to the left port of the optical coupler 1 (41) by the interference between them.

The format-converted serial data outputted by the above operation is passed through the optical band pass filter 48 to be output 39. The serial data period of the output data is the time interval T _d (64) from the first serial data bit 1 (59) to the second serial data bit 1 (62), and the serial data rate is bit 3 (60) and 4 It is the inverse 1 / T _b of the bit period T _b 63, which is the time interval between two adjacent bits such as the bit 61.

The all-optical serial-to-parallel data format converter and the parallel-to-serial data format converter, which operate as described above, differ from the conventional electrically controlled data format converters to convert the optical data through all-optical processing. Therefore, it is possible to convert the format of optical signal.

As described through the above embodiments, the all-optical serial-to-parallel data format converter of the present invention uses a delay and demultiplexing scheme of a multi-wavelength clock signal and an all-optical signal processing technique to provide a conventional serial-to-parallel data format. Compared to the conversion device, the number of optical elements is significantly reduced. In addition, the data conversion device from all-optical parallel to serial data delays of one wavelength or multi-wavelength clock signal and the all-optical signal processing technique are performed in parallel. By converting input optical data into serial optical data, the data format conversion from ultra-fast all-optical parallel to serial is easy, unlike conventional electrical parallel to serial data format conversion apparatuses. All-optical serial / parallel data format conversion device using SLALOM Transmitting, optical switching, optical signal processing, because the realization of the optical effect of a computing device and more feasible very useful inventions the broadband industry.

Claims (2)

In the all-optical / parallel data format converter, An optical apparatus for converting data format from serial to parallel includes an optical fiber delay line (1) for aligning input clock signals in a line; A wavelength multiplexer (2) for wavelength multiplexing the delayed clock signal; An input port (3) of optocoupler 1 for inputting the output of the wavelength multiplexer into a loop; A 50:50 optical coupler (4) for inputting the signal of the input port (3) to the loop; A serial data input port 5 to which serial data is input; An optocoupler 2 (8) coupled in a loop for the input serial data to be used as a control signal; A semiconductor optical amplifier (9) for causing a phase change in an input clock signal by the control signal; An optical fiber 10 constituting a loop; An output port (11) of optical coupler 1 connecting the output of the loop and the wavelength demultiplexer; A wavelength demultiplexer 12 for separating the parallel data by wavelength demultiplexing the output parallel data; And an optical fiber delay line (13) for delaying time to output the output data of the wavelength demultiplexer (12) at the same time. In the all-optical / parallel data format converter, An optical device for converting data from all-optical parallel to serial includes an optical fiber delay line 40 for delaying time of input parallel data by an integer multiple of the bit period Tb; A parallel data input port 37; A serial clock signal input port 38; A serial data output port 39 serially converted; An Nx1 optical coupler 3 (43) for combining the time delayed parallel data; Optical coupler 2 (42) for combining the aligned parallel data in a loop; An optical coupler 1 (41) for inputting an input serial clock signal into a loop; A semiconductor optical amplifier (44) for causing a phase change in the serial clock signal input by the parallel data signal; A loop 47 composed of an optical fiber; An all-optical serial / parallel data format converter using SLALOM, comprising an optical bandpass filter (48) for passing only serial data wavelengths.