KR101538914B1 - Optical transmeter based on interferometic noise supressed and pulsed bls - Google Patents
Optical transmeter based on interferometic noise supressed and pulsed bls Download PDFInfo
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- KR101538914B1 KR101538914B1 KR1020130162366A KR20130162366A KR101538914B1 KR 101538914 B1 KR101538914 B1 KR 101538914B1 KR 1020130162366 A KR1020130162366 A KR 1020130162366A KR 20130162366 A KR20130162366 A KR 20130162366A KR 101538914 B1 KR101538914 B1 KR 101538914B1
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- bls
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/501—Structural aspects
- H04B10/506—Multiwavelength transmitters
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Abstract
A pulse BLS based optical transmitter with suppressed interference noise is disclosed. The light source unit of the present invention includes an injection unit for injecting pulses into the output of the broadband light sources BLS and BLS and outputting a signal of a single polarized light, an optical control unit for distributing the output of the injection unit, And an optical amplifying section for amplifying the output of the light control section.
Description
The present invention relates to a pulsed BLS based optical transmitter with suppressed interference noise.
Recently, a Wavelength Division Multiplexing (WDM) optical communication system has been considered as a next generation network in order to deal with the broadband demand of subscribers for video-centric services. Which can provide a very high bit-rate.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic view of an optical transmitter capable of operating in a wavelength-independent manner in a general WDM system.
The broadband light source (BLS) 100 used here is an amplified spontaneous emission (ASE) based light source and the reflective modulator (RM) 200 is a wavelength division multiplexing / An element for modulating and transmitting a signal of the
The configuration of the conventional BLS 100 will now be described. 2 is a detailed block diagram of BLS in FIG.
The BLS 100 is comprised of a first stage and a second stage and in the second stage a C-band generated by a pump laser diode (LD) Or L-band is amplified by an Erbium Doped Fiber (EDF) 120 to generate an initial C-band or L-band ASE, and a gain flattening filter (GFF) 130 are amplified again by the EDF 140 and the
However, since such a conventional light source requires high
SUMMARY OF THE INVENTION It is an object of the present invention to provide an optical transmitter which is cost effective and can improve transmission performance by injecting pulse-BLS suppressed interference noise.
According to an aspect of the present invention, there is provided a light source unit including: a broadband light source (BLS); An injection unit injecting a pulse into an output of the BLS to output a signal of a single polarization; A light controller for distributing the output of the injector and delaying one of the pulses by one pulse period; And an optical amplifier unit for amplifying the output of the light control unit.
In one embodiment of the present invention, the BLS can output a single polarized light.
In one embodiment of the present invention, the BLS may output non-polarized light, and the light source unit may further include a light splitting unit that splits any one of the unpolarized lights.
In one embodiment of the present invention, the injector includes: a pulse supplier for providing a clock signal of a predetermined frequency; And a modulator for modulating the clock signal provided by the pulse providing unit to the output of the BLS.
In one embodiment of the present invention, the injection unit further includes a first control unit disposed at a front end of the modulation unit, for controlling polarization of input light so that the polarization of the input light and the polarization of the modulation unit are polarized in the same direction .
In one embodiment of the present invention, the light control unit includes: a distribution unit that distributes input light to a first path and a second path; An optical ground edge for delaying the light of the second path by one pulse period than the light of the first path; And a coupling unit coupling light of the first path and light of the second path delayed by the light edge.
In one embodiment of the present invention, the light control unit may further include a second and a third control unit for respectively controlling the polarization of the light of the first path and the light of the second path to be perpendicular to each other.
The light source unit according to an embodiment of the present invention may further include a filter unit for spectrally dividing light inputted in a predetermined band at a front end of the optical amplifying unit.
According to another aspect of the present invention, there is provided an optical transmitter including: the light source unit; A demultiplexer for demultiplexing the pulsed light input from the light source; A plurality of reflective modulators for modulating the pulsed light received from the demultiplexer into an electrical NRZ signal; And a multiplexer for multiplexing a plurality of signals input from the plurality of reflection type modulators.
In one embodiment of the present invention, the reflection type modulator can output an RZ optical signal.
The optical transmitter of one embodiment of the present invention may further include a synchronization unit for synchronizing the light input to the reflection type modulator and the electrical NRZ signal.
According to the present invention as described above, by injecting the pulse-BLS suppressing the interference noise, the threshold value (FECth) of the Forward Error Correction (FEC) code is satisfied at a low injection power and the received power The same effect can be obtained.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic view of an optical transmitter capable of operating in a wavelength-independent manner in a general WDM system.
2 is a detailed block diagram of BLS in FIG.
3 is a block diagram of an optical transmitter according to an embodiment of the present invention.
4A is an exemplary view showing an output signal of the pulse injecting unit of FIG.
4B is an exemplary view showing an output signal of the light control unit of FIG.
4C is an example of an output signal of the optical transmitter of the present invention.
5 and 6 are diagrams for explaining the performance of the light source unit of the present invention.
7 is a configuration diagram of another embodiment of an optical transmitter according to the present invention.
8 and 9 are block diagrams of a WDM system to which the optical transmitter of the present invention is applied.
10A and 10B are views illustrating BERs for explaining 10 Gb / s transmission characteristics according to an injection light source.
11 is an example for comparing the performance of the pulse-BLS according to the injection light source.
While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and will herein be described in detail. It should be understood, however, that the invention is not intended to be limited to the particular embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.
Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.
3 is a block diagram of an
The
The
The first stage is a step for generating an initial C-band or L-band ASE, and may include a BLS 11. The BLS 11 is a polarized BLS that generates C-band or L-band ASE, and may be, for example, a highly efficient superluminescent diode (SLD) or a reflective semiconductor optical amplifier Optical Amplifier (RSOA). Also, the BLS 11 may be a Fabry-Perot Laser Diode (F-P LD) or a mutually implanted FP-LD to reduce the dispersion effect. However, the BLS 11 of the present invention is not limited thereto, and various devices with high cost efficiency capable of generating ASE light may be applied.
The second stage is a step of removing the interference of the light source injected with the pulse, and includes the
First, the
The
That is, the ASE injected light output from the BLS 11 can be modulated into pulse-BLS by the
On the other hand, the
The
The second
The
4B is an example of an output signal of the
The third stage may include a pre-filter 14 and an optical amplifying
The
The light output from the
The
In the present invention, the electrical signal input to the
A modulator or a receiver having a wide bandwidth is usually required for generating an RZ signal. The present invention can generate an RZ optical signal using an electrical NRZ signal, thereby improving the receiver sensitivity without requiring a broadband modulator or a receiver It is possible to generate the RZ format signal.
3, a Variable Optical Delay Line (VODL) may be used at the front end of the
4C is an example of an output signal of the optical transmitter according to the present invention. The light output from the
5 and 6 are graphs for explaining the performance of the
As shown in the figure, it can be seen that 4 dB noise is reduced compared to the conventional polarized light BLS (A) and 1 dB noise is reduced compared to the non-polarized light BLS (B). That is, according to the present invention, when the same RIN as the non-polarized light BLS (B) is to be obtained, the injection optical power can be lowered by about 3 dB.
In FIG. 6, D represents RIN for the frequency of the polarized light BLS in FIG. 1, E represents RIN for the frequency of the non-polarized light BLS, and G represents RIN for the frequency of the
When the ASE light source is injected into the reflection type modulator, a gain saturation phenomenon occurs in which the gain decreases as the intensity of the injected light increases. As shown in the figure, in the case of the non-polarized light BLS (E) The noise in the low frequency band is reduced by about 10 dB compared to the polarized light BLS (D) due to the gain saturation phenomenon, but the noise in the high frequency band can not be effectively suppressed. According to the
7 is a configuration diagram of another embodiment of the optical transmitter according to the present invention. The configuration in which the
In another embodiment of the present invention, for example, an EDFA can be used as the
8 and 9 are block diagrams of an embodiment of a WDM system to which the optical transmitter of the present invention is applied, FIG. 8 is for explaining transmission of 10 Gb / s downstream signals, and FIG. will be.
As shown in the figure, a WDM system to which the
In the example of Fig. 8, an example in which the polarized BLS 11 of Fig. 3 is used has been described, but it is apparent that the
In the CW ASE outputted from the BLS 11, pulses are injected by the
The output light is input to the wavelength division multiplexing / demultiplexing
The
The RZ optical signal modulated with the data signal through the
9 is a diagram for explaining upstream signal transmission. The pulse-BLS outputted from the
10A and 10B are diagrams illustrating a bit error rate (BER) for explaining a 10 Gb / s transmission characteristic according to an injection light source. FIG. 10A illustrates a case where CW-BLS of unpolarized light is used as an injection light source FIG. 10B shows a BER curve according to injection power when the pulse-BLS of the present invention is used as an injection light source and the signal transmission format is RZ.
As shown in FIG. 10A, according to the conventional optical transmitter, a first-generation FEC threshold (FECth), a minimum injection power defined by an injection power of 1.8 × 10 -4 to -18 dBm (ITU-T International Standard G.698.3) ), It has a power penalty of 9dB. However, according to the optical transmitter of the present invention, FECth can be satisfied at a power penalty of 2 dB at an injection power of -18 dBm. That is, according to the optical transmitter of the present invention, the power penalty can be improved by 7 dB as compared with the conventional CW-BLS / NRZ.
11 is a diagram for comparing the performance of a pulse-BLS according to an injection light source. In comparison with a non-polarized pulse-BLS and a polarizing pulse-BLS in which the optical control unit (MZI) 13 of the present invention is not used, As shown in the drawing, the optical control unit (MZI) 13 shows the pulse-BLS used.
As shown in the figure, the optical control unit (MZI) 13 of the present invention can lower the injection power by about 3 dB in order to obtain the same received power, as compared with the non-polarized pulse-BLS. The pulse-BLS in which the optical control unit (MZI) 13 of the present invention is used has the following relationship: BLS is the polarized light BLS, the non-polarized light BLS And has the advantage of being able to provide the same performance regardless of the performance.
While the invention has been shown and described with reference to certain preferred embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined by the appended claims. Accordingly, the true scope of the present invention should be determined by the following claims.
10: light source 11. 16: BLS
12: Pulse injection unit 13: Light control unit
14: front-end filter 15:
Claims (11)
An injection unit injecting a pulse to an output of the light source and outputting a pulse-BLS of a single polarization;
The pulse-BLS of the single polarized light is distributed 50 to 50 in two paths so that the respective photocurrents generated from the two orthogonally polarized lights cause destructive interference with each other, and the light of one of the paths is divided into one pulse A light control unit for controlling the polarized light of the light of the two paths to be vertical and outputting a non-polarized pulse -BLS by coupling the light of the two paths; And
And an optical amplifier for amplifying the output of the light control unit,
The injection unit
A modulator for injecting a pulse into an output of the light source; And
And a first control unit which is disposed at a front end of the modulation unit and controls polarization of the input light so that the polarization of the light input from the light source is polarized in the same direction as the polarization of the modulation unit,
Wherein the modulator comprises:
A light source unit for injecting a pulse to an output of the light source whose polarization is controlled by the first control unit and outputting the pulse-BLS of the single polarization.
A light source section for outputting a single polarized light.
Wherein the light source unit further comprises a light splitting unit that splits any one of the unpolarized lights.
And a pulse providing section for providing a clock signal of a predetermined frequency,
Wherein the modulator comprises:
And a light source section for modulating the clock signal provided by the pulse providing section to the output of the first control section.
A distribution unit for distributing the input single-polarization pulse-BLS to the first path and the second path 50 to 50;
An optical ground edge for delaying the light of the second path by one pulse period than the light of the first path; And
And a coupling unit coupling light of the first path and light of the second path delayed by the light edge.
And a second and a third control unit for respectively controlling the polarized light of the first path and the polarized light of the second path to be perpendicular to each other.
Further comprising a filter section for spectrally dividing light input into a predetermined band at a front end of the optical amplification section.
A demultiplexer for demultiplexing the pulsed light input from the light source according to a wavelength;
A plurality of reflection type modulators for modulating data and reflecting the pulsed light received from the demultiplexing unit; And
And a multiplexing unit multiplexing a plurality of signals input from the plurality of reflection type modulators,
The plurality of reflection type modulators include:
The optical transmitter is driven by an input non-return-to-zero (NRZ) signal to generate a return-to-zero (RZ) optical signal and reflects the optical signal to the multiplexer.
Further comprising a synchronization unit for synchronizing the optical NRZ signal with the light input to the reflection type modulator.
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
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KR1020130162366A KR101538914B1 (en) | 2013-12-24 | 2013-12-24 | Optical transmeter based on interferometic noise supressed and pulsed bls |
PCT/KR2014/011215 WO2015099294A1 (en) | 2013-12-24 | 2014-11-20 | Optical transmitter based on interferometric noise suppressed and pulsed bls |
DE112014000187.2T DE112014000187T5 (en) | 2013-12-24 | 2014-11-20 | Optical transmitter based on an interferometric noise suppressed and pulsed BLS |
Applications Claiming Priority (1)
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KR1020130162366A KR101538914B1 (en) | 2013-12-24 | 2013-12-24 | Optical transmeter based on interferometic noise supressed and pulsed bls |
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KR20150074509A KR20150074509A (en) | 2015-07-02 |
KR101538914B1 true KR101538914B1 (en) | 2015-07-29 |
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KR1020130162366A KR101538914B1 (en) | 2013-12-24 | 2013-12-24 | Optical transmeter based on interferometic noise supressed and pulsed bls |
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DE (1) | DE112014000187T5 (en) |
WO (1) | WO2015099294A1 (en) |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20050259989A1 (en) * | 2004-05-18 | 2005-11-24 | Sorin Wayne V | Multiple-wavelength pulsed light source for a wavelength division multiplexed passive optical network |
WO2012073590A1 (en) * | 2010-11-30 | 2012-06-07 | 三菱電機株式会社 | Optical transport system, optical transmitter device and optical receiver device |
Family Cites Families (1)
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JP5139159B2 (en) * | 2008-06-04 | 2013-02-06 | 独立行政法人情報通信研究機構 | Data transmission system and method |
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2013
- 2013-12-24 KR KR1020130162366A patent/KR101538914B1/en active IP Right Grant
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2014
- 2014-11-20 DE DE112014000187.2T patent/DE112014000187T5/en not_active Withdrawn
- 2014-11-20 WO PCT/KR2014/011215 patent/WO2015099294A1/en active Application Filing
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20050259989A1 (en) * | 2004-05-18 | 2005-11-24 | Sorin Wayne V | Multiple-wavelength pulsed light source for a wavelength division multiplexed passive optical network |
WO2012073590A1 (en) * | 2010-11-30 | 2012-06-07 | 三菱電機株式会社 | Optical transport system, optical transmitter device and optical receiver device |
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DE112014000187T5 (en) | 2015-10-01 |
WO2015099294A1 (en) | 2015-07-02 |
KR20150074509A (en) | 2015-07-02 |
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