KR101538914B1 - Optical transmeter based on interferometic noise supressed and pulsed bls - Google Patents

Optical transmeter based on interferometic noise supressed and pulsed bls Download PDF

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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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South Korea
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light
pulse
unit
bls
light source
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KR1020130162366A
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Korean (ko)
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KR20150074509A (en
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이창희
유상화
문상록
계명균
한승철
손동협
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한국과학기술원
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Priority to PCT/KR2014/011215 priority patent/WO2015099294A1/en
Priority to DE112014000187.2T priority patent/DE112014000187T5/en
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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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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Optical Communication System (AREA)

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

TECHNICAL FIELD [0001] The present invention relates to an optical transmitter based on pulsed BLS in which interference noise is suppressed,

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 light source 100 spectrally divided by the multiplexing unit 300 and performing amplification, modulator and noise suppression functions.

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 pump LD 150 of the first stage and finally output.

However, since such a conventional light source requires high output pump LDs 110 and 150 in each stage, there is a problem in that the cost is increased. Due to the light intensity noise, a high optical transmission system of about 10 Gb / There is a problem in that a limit is imposed on the implementation.

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 optical transmitter 1 according to an embodiment of the present invention.

The optical transmitter 1 of the present invention includes a light source 10, a wavelength division multiplexing / demultiplexing unit 20, a reflection type modulator (RM) 30, and a circulator 40 can do. However, in the description of the reflection type modulator 30 of the present invention, it is shown that it is composed of one element, but it may be composed of one element or a plurality of elements. An example in which a plurality of elements are formed will be described later.

The light source unit 10 of the present invention may be composed of a first stage, a second stage and a third stage.

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 pulse injecting unit 12 and the light controlling unit 13. The pulse injecting section 12 may include a first polarization control section 12A, a pulse providing section 12B and a modulating section 13C. The light controlling section 13 may include a distributing section 13A, And may include a polarization controller 13B, an optical delay (ODL) 13C, a third polarization controller 13D, and a polarizing beam combiner (PBC) 13E.

First, the modulator 12C is a modulator having a predetermined polarization, and may be, for example, a Mach-Zehnder modulator (MZM). The first polarization control section 12A controls the polarizations of the BLS 11 and the modulation section 13C and controls the polarizations of the BLS 11 and the modulation section 13C in the same direction In the X-direction).

The pulse providing section 12B may provide a clock signal having the same frequency as the data rate provided to the reflective modulator 30. [ The pulse providing portion 12B can provide a clock signal of, for example, 10.7 GHz.

That is, the ASE injected light output from the BLS 11 can be modulated into pulse-BLS by the pulse providing portion 12B and the modulating portion 12C. 4A is an exemplary diagram showing an output signal of the pulse injecting unit 12 of FIG. As shown in the figure, the light output from the pulse injecting section 12 is a single polarization in which pulses are applied to a continuous wave.

On the other hand, the distribution unit 13A of the light control unit 13 distributes the inputted pulse-BLS by 50: 50, and provides it to the first path (1) and the second path (2).

The light edge portion 13C of the second path (2) can delay the inputted pulse-BLS by one pulse period.

The second polarization control unit 13B and the third polarization control unit 13D can control the first path (1) and the light passing through the light and optical edge 13C to be vertically polarized. That is, when the light that has passed through the second polarization control section 13B is polarized in the X direction, the light that has passed through the third polarization control section 13D can be polarized in the Y-direction.

The PBC 13E combines the light of the first path and the light of the second path, whereby the light in the X direction and the light in the Y direction delayed by one pulse period can be combined and output.

4B is an example of an output signal of the light control unit 13 of FIG. As shown in the figure, it can be seen that the light polarized in the X direction and the light polarized in the Y direction delayed by one pulse period are combined and output.

The third stage may include a pre-filter 14 and an optical amplifying section 15. [ The pre-stage filter 14 is optional and is intended to alleviate the filtering effect of the wavelength division multiplexing / demultiplexing unit 20. The bandwidth of the pre-stage filter 14 may be about 70% of the bandwidth of the wavelength division multiplexing / demultiplexing unit 20, and the light input in the predetermined bandwidth may be spectrally divided.

The optical amplifying unit 15 may be, for example, an Erbium Doped Fiber Amplifier (EDFA), and may amplify and output the input light.

The light output from the light source unit 10 is input to the wavelength division multiplexing / demultiplexing unit 20 by the circulator 40. The wavelength division multiplexing / demultiplexing unit 20 demultiplexes the signals by the spectrum, Type modulator 30 as shown in FIG. The wavelength division multiplexing / demultiplexing unit 20 may include, for example, an arrayed-waveguide grating; AWG).

The reflection type modulator 30 of the present invention modulates data to the wavelength-division-multiplexed light from the wavelength division multiplexing / demultiplexing unit 20, reflects it, and inputs the reflected light to the wavelength division multiplexing / demultiplexing unit 20. The wavelength division multiplexing / demultiplexing unit 20 multiplexes the inputted wavelength-modulated light, and the multiplexed light can be transmitted to the transmission fiber 50 through the circulator 40.

In the present invention, the electrical signal input to the reflective modulator 30 may be a non-return-to-zero (NRZ) signal. When the injected light of the pulse train is inputted to the reflection type modulator 30 driven by the NRZ signal, a return-to-zero (RZ) optical signal is outputted. Usually, for coherent light, the RZ format is more vulnerable to fiber dispersion than the NRZ format because the RZ format has a broader linewidth than NRZ. However, for spectral-split light, the spectral line width is determined by dividing the bandwidth, so that the RZ format having a large margin between adjacent bits is advantageous in widening the dispersion-induced pulse than the NRZ format, Respectively. In addition, since the RZ signal has a better signal-to-noise ratio than the NRZ signal, the sensitivity of the receiver can be improved.

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 reflective modulator 30. The VODL can synchronize the optical NRZ signal to be modulated with the optical pulse injected into the reflective modulator 30.

4C is an example of an output signal of the optical transmitter according to the present invention. The light output from the reflection type modulator 30 is multiplexed by the wavelength division multiplexer / demultiplexer 20 and transmitted through the circulator 40 And output to the transmission fiber. As shown in the figure, it can be seen that the RZ optical signal is being output.

5 and 6 are graphs for explaining the performance of the light source unit 10 of the present invention. In FIG. 5, A represents relative intensity noise for ASE injection power when the BLS 100 of FIG. 1 is linearly polarized B is the RIN for the ASE injection power when the BLS 100 of FIG. 1 is non-polarized, C is the RIN for the ASE injection power of the light source 10 of the present invention, Lt; / RTI >

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 light source 10 of the present invention. F is the RIN of the input signal at the transmitter. All four cases were measured at -12dBm injection optical power.

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 light source unit 10 of the present invention, the light control unit 13 can effectively improve the noise characteristic over a wide frequency band in the band of about 5.35 GHz.

7 is a configuration diagram of another embodiment of the optical transmitter according to the present invention. The configuration in which the non-polarized light BLS 16 is used as the light source in the first stage and the polarization splitting section 17 is further disposed is shown in the embodiment of FIG. 3 The description of the remaining components will be omitted.

In another embodiment of the present invention, for example, an EDFA can be used as the unpolarized BLS 16, and the EDFA has two vertically polarized lights, and only one polarized light is separated And can be input to the second stage of the present invention. On the other hand, the other polarized light separated by the polarized light separator 17 may be used for another optical transmitter.

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 optical transmitter 1 of the present invention is applied is configured to demultiplex the light transmitted from the optical transmitter 1 as a head-end to a demultiplexer 2, And is transmitted to a plurality of tail-end equipment (TEE) 3. In an example of the present invention, since the wavelength division multiplexing / demultiplexing unit 20 of the optical transmitter 1 multiplexes and transmits the wavelengths at 40 wavelengths, the TEE is described as 40. However, the present invention is not limited thereto. In addition, although only one head-end equipment (HEE) is shown for the sake of simplicity, it will be apparent in the technical field of the present invention that 40 HEEs can transmit the TEE.

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 non-polarized BLS 16 of Fig. 7 may be used.

In the CW ASE outputted from the BLS 11, pulses are injected by the pulse injecting unit 12. The light injected with the pulses separated by the same light intensity by the distribution section 13A is coupled with the pulse being delayed by one pulse period so that the polarized light is vertical and is spectrally divided by the front end filter 14, And is output.

The output light is input to the wavelength division multiplexing / demultiplexing unit 20 by the circulator 40, and the wavelength division multiplexing / demultiplexing unit 20 demultiplexes the input light into the reflection type modulator 30 .

The reflection type modulator 30 may be an SOA-REAM in which a reflective electro-absorption modulator (REAM) and a semiconductor optical amplifier (SOA) are integrated. The SOA suppresses, amplifies and reflects the incoming light, and the REAM modulates the NRZ signal of 10.7 GHz into the corresponding light. Since the light input to the SOA-REAM is pulse-BLS, the NRZ signal can be output as the RZ signal.

The RZ optical signal modulated with the data signal through the reflection type modulator 30 is multiplexed through the wavelength division multiplexer / demultiplexer 20 and is multiplexed through a dispersion compensating fiber (DCF) (Single Mode Fiber) (SMF). The demultiplexed RZ optical signal in the demultiplexing unit 2 can be transmitted to the TEE optical receiver 70.

9 is a diagram for explaining upstream signal transmission. The pulse-BLS outputted from the light source unit 10 is demultiplexed by the circulator 40 in the multiplexer / demultiplexer 2 through the DCF and the SMF, And is modulated in the RZ format by the reflection type modulator 30 provided in the TEE 3. The modulated pulse-BLS is multiplexed in the multiplexing / demultiplexing unit 2, demultiplexed by the wavelength division multiplexing / demultiplexing unit 20 through the circulator 40 of the head-end 1, May be received.

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)

Broadband light source;
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.
The light source according to claim 1,
A light source section for outputting a single polarized light.
The light source according to claim 1, wherein the light source outputs non-polarized light,
Wherein the light source unit further comprises a light splitting unit that splits any one of the unpolarized lights.
The apparatus according to claim 1,
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.
delete The light control apparatus according to claim 1,
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.
7. The apparatus according to claim 6,
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.
The method according to claim 1,
Further comprising a filter section for spectrally dividing light input into a predetermined band at a front end of the optical amplification section.
The light source unit according to any one of claims 1 to 4 and 6 to 8;
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.
delete 10. The method of claim 9,
Further comprising a synchronization unit for synchronizing the optical NRZ signal with the light input to the reflection type modulator.
KR1020130162366A 2013-12-24 2013-12-24 Optical transmeter based on interferometic noise supressed and pulsed bls KR101538914B1 (en)

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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

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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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Citations (2)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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

Patent Citations (2)

* Cited by examiner, † Cited by third party
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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