KR20070100086A - Super broadband light source generator based on erbium fiber amplified spontaneous emission(ase) and wave division multiplexing passive optical network(wdm-pon) using the same - Google Patents

Abstract

An apparatus for generating super wideband light source generator on the base of spontaneous emission amplified in erbium fiber and a WDM-PON(Wave Division Multiplexing Passive Optical Network) using the same are provided to be applicable to an optical sensor or the WDM-PON by using a simple configuration. An apparatus for generating super wideband light source generator on the base of spontaneous emission amplified in erbium fiber comprises an EDF(Erbium Doped Fiber), an optical fiber amplifier, and an HNL-DSF(Highly Nonlinear Dispersion Shifted Fiber). The EDF outputs an incoherent ASE(Amplified Spontaneous Emission) seed light source which receives the first pumping light. The optical fiber amplifier amplifies the seed light source inputted from the EDF by pumping the seed light source in a forward direction via the second pumping light, pumping it in a backward direction via the third pumping light or pumping it in both directions. The HNL-DSF converts an amplified light source, inputted from the optical fiber amplifier, into a super wideband light source thorugh a nonlinear light source.

Description

Super Broadband Light Source Generator based on Erbium Fiber Amplified Spontaneous Emission (ASE) and Wave Division Multiplexing Passive Optical Network (WDM-PON) using the same}

1 is a block diagram of an ASE-based continuous wave supercontinuum broadband light source generator in an erbium-doped optical fiber according to an embodiment of the present invention.

FIG. 2 is a graph showing the bandwidth and light output intensity of light sources output from each optical fiber in the broadband light source generator of FIG. 1.

FIG. 3 is an experimental configuration diagram for measuring performance when a light source generated by the broadband light source generator of FIG. 1 is used in a wavelength division multiple passive optical network.

4 is a diagram illustrating a multi-wavelength optical signal obtained by dividing the output spectrum generated in FIG. 1 using a multi-wavelength filter having a wavelength range of 1 nm.

FIG. 5 is a diagram illustrating a bit error rate (BER) curve showing 25 Km transmission performance of the multi-wavelength channel signals generated in FIG. 4.

FIG. 6 is a view showing a light source generated in the broadband light source generator of FIG. 1 using a Fabry-Perot Laser Diode (FP-LD) or a Reflective Semiconductor Optical Amplifier (RSOA) for injection locking. ) Is a configuration diagram applied to wavelength division multiple passive optical network based on.

FIG. 7 is a detailed embodiment of FIG. 6, in which a light source generated by a broadband light source generator is a Fabry-Perot Laser Diode (FP-LD) or a reflective semiconductor optical amplifier for injection locking. This is a configuration applied to the wavelength division multiple passive optical network based on Semiconductor Optical Amplifier (RSOA).

FIG. 8 is a further embodiment of FIG. 6, in which a light source generated by the broadband light source generator is a Fabry-Perot Laser Diode (FP-LD) or a reflective semiconductor optical amplifier for injection locking. This is another configuration applied to wavelength division multiple passive optical network based on Reflective Semiconductor Optical Amplifier (RSOA).

FIG. 9 is a diagram illustrating C-band, L-band, and U-band by dividing an erbium-doped optical fiber ASE-based supercontinental light source by wavelength.

* Description of the major symbols in the drawings *

10, 14, 17: pumping light 11, 15, 18: pumping light coupler

12: Erbium-doped optical fiber 13, 19: isolator

16: Erbium or rare earth-doped optical fiber 20: Highly nonlinear fiber

30: Ultra-wide band light source 40: Multiple wavelength filter

50: light attenuator 60: modulator

70: single mode fiber 80: AWG

90: Receiver

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a self-emissive (ASE) based ultra-wideband light source generator amplified in erbium fiber, specifically generating ultra-wideband light sources as well as high power for wavelength division multiplex (WDM) passive optical networks and optical sensor applications. The present invention relates to a self-emissive (ASE) based ultra-wideband light source generator amplified in an erbium fiber and a wavelength division multiple passive optical network using the same.

Recent advances in the technology of Optical Sense and Wave Division Multiplexing Passive Optical Networks (WDM PON) require broadband incoherent high power light sources used in these applications. It is becoming.

Amplified Spontaneous Emission (hereinafter referred to as "ASE") light source based on erbium-doped fiber, Incoherent broadband light source, LED light source using semiconductor, Superluminescent Laser Diode (LD) light source ASE light source based on erbium-doped optical fiber has the advantage of higher output and wider bandwidth than LED light source or super light emitting LD light source using semiconductor, but it is still limited to 30 ~ 80 nm and more than tens of mW light. Since there is a limit that the output does not come out, there is an urgent need for a new concept of broadband high power light source to overcome this problem.

An object of the present invention is to provide a light coherence-free broadband light source having an ultra-wide band of more than 100 nm and a high power light intensity of more than 100 mW.

It is also an object of the present invention to provide a broadband, high power, optical coherence-free broadband light source generator that can be used as a basic light source for an optical sensor and a wavelength division multiple passive optical network with a simple configuration.

The objective is to convert a high power coherent amplified self-emitting (ASE) light source from an erbium-doped optical fiber into a high power ultra wide band light source using a nonlinear phenomenon on a high nonlinear fiber. Can be achieved.

In addition, the ultra-wideband light source generator for achieving the above object is an erbium-added optical fiber for receiving the first pumping light and outputs an amplified self-emitting (ASE) seed light source without coherence; An optical fiber amplifier which is forward pumped by the second pumping light and backward pumped by the third pumping light, and amplifies and outputs a seed light source input from the erbium-doped optical fiber; And a high nonlinear optical fiber converting the amplified light source received from the optical fiber amplifier into an ultra-wide band light source using a nonlinear phenomenon.

Further, the object is an erbium-doped optical fiber for receiving the first pumping light and outputs an amplified self-emitting (ASE) seed light source without coherence; An optical fiber amplifier which is forward pumped by the second pumping light and backward pumped by the third pumping light, and amplifies and outputs a seed light source input from the erbium-doped optical fiber; A high nonlinear optical fiber converting the amplified light source received from the optical fiber amplifier into an ultra-wide band light source using a nonlinear phenomenon; A multi-wavelength filter for dividing the ultra-wide band light source into a multi-wavelength signal; A modulator for data modulating the multi-wavelength signal; A single mode optical fiber in which the modulated multi-wavelength signal is transmitted; And a demultiplexer for demultiplexing the transmitted multi-wavelength signal.

In addition, the wavelength division multiple passive optical network to achieve the above object is a Fabry-Perot Laser Diode (FP-LD) or Reflective Semiconductor Optical Amplifier (Injection Locking): In the RSOA-based wavelength division multiple passive optical network, an erbium-doped optical fiber ASE-based supercontinuum light source is used as the injection locking light source.

In addition, the above object is a Fabry-Perot Laser Diode (FP-LD) or Reflective Semiconductor Optical Amplifier for Injection Locking for transmitting and receiving data between the central base station and the subscriber network. In the wavelength division multiple passive optical network based on an Amplifier (RSOA), the central base station comprises: an erbium-doped optical fiber ASE-based supercontinuum light source; A wavelength division multiplexer for dividing the supercontinental light source into a plurality of wavelength bands; And a coupler for transmitting the divided wavelengths to the central base station or the subscriber network, wherein a C-band light source of 1530 nm to 1565 nm among the supercontinental light sources divided into the plurality of wavelengths is a downlink signal present in the central base station. Used as an injection-locking light source for generation, L-band light source of 1565nm ~ 1610nm among the supercontinentium light sources divided into the plurality of wavelengths is used as the injection-locking light source for generating the uplink signal existing in the subscriber network. It can be achieved by a wavelength division multiple passive optical network characterized in that.

Further, the above object is a Fabry-Perot Laser Diode (FP-LD) or Reflective Semiconductor Optical Amplifier for Injection Locking for transmitting and receiving data between a central base station and a subscriber network. In the wavelength division multiple passive optical network based on an Amplifier (RSOA), the central base station comprises: an erbium-doped optical fiber ASE-based supercontinuum light source; A wavelength division multiplexer for dividing the supercontinental light source into a plurality of wavelength bands; And a coupler for transmitting the divided wavelengths to the central base station or the subscriber network, wherein a C-band light source of 1530 nm to 1565 nm among the supercontinental light sources divided into the plurality of wavelengths is an uplink signal existing in the subscriber network. Used as an injection-locking light source for generation, L-band light source of 1565 nm to 1610 nm among the supercontinentium light sources divided into the plurality of wavelengths is used as the injection-locking light source for generating the downlink signal existing in the central base station. It can be achieved by a wavelength division multiple passive optical network characterized in that.

Here, the U-band light source of 1610 nm or more among the supercontinental light sources divided into the plurality of wavelengths is used as a monitoring signal for checking whether the light sources operate normally.

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

1 is a block diagram of a continuous wave supercontinuum broadband light source generator based on an erbium-doped optical fiber ASE according to an embodiment of the present invention.

Referring to FIG. 1, a light source generator according to an embodiment of the present invention is pumped by a pumping light 10 through a pumping light combiner 11 to output an ASE seed light source (5m Erbium Doped Fiber) : EDF, 12, an isolator 13 for suppressing the occurrence of lasing in the erbium-doped optical fiber and output of narrow-band photocoherent laser output, and pumped light 14 through the pumping light combiner 15. Erbium-doped optical fiber that is forward-pumped by (), or pumped backward by pumping light (17) through pumping light combiner (18) or pumped bi-directionally to receive a seed light source from the erbium-doped fiber (12) and amplify and output it. (20m EDF) or 20m Er / Yb Fiber (16m Er / Yb Fiber) amplifier 16 and isolator that suppresses the occurrence of lasing in the amplifier, resulting in narrowband optical coherent laser output (19) It comprises: (Highly Nonlinear Dispersion Shifted Fiber 2Km HNL-DSF) and a non-linear optical fiber that converts the amplified light to the second broadband light source using a non-linear phenomenon.

The pumping lights 10, 14, 17 use a laser diode that outputs a pumping light of a predetermined wavelength, and pump the erbium-doped optical fibers 12, 16.

The pumping light couplers 11, 15, and 18 transmit the respective pumping lights 10, 14, and 17 to the erbium-doped optical fiber 12, 16.

The isolators 13 and 19 not only allow the light source to be transmitted in the forward direction but also serve to suppress the occurrence of a narrow band optical coherent laser output due to a lasing phenomenon in the erbium or the rare earth-added optical fiber.

The high nonlinear fiber may be a silica based high nonlinear distributed transition fiber (HNL-DSF), photonic crystal optical fiber (PCF), bismuth nonlinear fiber or chalcogenide fiber (Chalcogenide Fiber).

FIG. 2 is a graph showing the bandwidth and light output intensity of light sources output from each optical fiber in the broadband light source generator of FIG. 1.

1 and 2, first, an ASE light source emitted from a 5 m erbium-doped optical fiber 12 pumped by the pumping light 10 is used as a seed light source. At this time, the generated light output is about 5 mW, and the light output spectrum at this point has a bandwidth of about 30 nm (see 1 in Fig. 2).

Next, the low power ASE light generated by the erbium-doped optical fiber 12 is once again pumped forward by the pumping light 14, and is reversely pumped by the pumping light 17 to produce a high power erbium-added optical fiber or a rare earth-added optical fiber. The optical output power is increased to 800mW through a (16) based amplifier. At this time, while the bandwidth of the amplified light is reduced to about 15nm, the intensity of the output increases (see ② in Fig. 2).

Finally, when amplified high power ASE light is incident on a 2Km high nonlinear optical fiber (HNL-DSF), it is applied to an ultra-wideband light source of 100 nm or more through modulation instability and stimulated Raman interaction. Convert The output intensity at this time is about 500 mW (see ③ in FIG. 2).

As described above, according to an embodiment of the present invention, a new concept based on an erbium-doped fiber ASE light source and having a bandwidth of more than 100 nm and a light intensity of more than 100 mW by using supercontinuity in a nonlinear optical fiber Incoherent ultra-wideband light source can be generated.

Such high power, ultra-wideband light sources should have characteristics that are good enough for use in optical sensors or wavelength division multiple passive optical networks. In order to confirm this, measurement will be made with reference to FIG. 3.

FIG. 3 is an experimental block diagram for measuring performance when a light source generated in the broadband light source generator of FIG. 1 is used in a wavelength division multiple passive optical network, and FIG. 4 shows an output spectrum having the wavelength of 1 nm generated in FIG. A diagram showing a multi-wavelength optical signal obtained by dividing a spectrum using a multi-wavelength filter.

3 and 4, the wavelength division multiple passive optical network is slicing the spectrum using a multiwavelength filter 40 using the erbium-doped optical fiber ASE-based supercontinuum light source 30 generated in FIG. 1. slicing to produce more than 100 channel signals as shown in FIG.

The one hundred channel signals are modulated by the data modulator 60 through the optical attenuator 50 and then transmitted by 25Km single mode fiber 70, and then AWG (Arrayed Waveguide Grating, After demultiplexing through 80), a signal is received through the receiver 90.

FIG. 5 is a diagram illustrating a bit error rate (BER) curve showing 25 Km transmission performance of the multi-wavelength channel signals generated in FIG. 4.

Referring to FIG. 5, as a result of measuring a bit error rate (BER) by selecting only five signals among signals transmitted through a wavelength division multiple passive optical network, for example, by simply connecting cables in the 1590 nm band ( If you look at the received back-to-back and the signal received after passing through 25Km fiber, you can see that it was transmitted without error.

Also, looking at the graph, all five signals exhibit successful transmission characteristics without error. From these results, it can be seen that the broadband light source generation of FIG. 1 according to the embodiment of the present invention has a characteristic sufficient to be used in a wavelength division multiple passive optical network.

FIG. 6 is a view showing a light source generated in the broadband light source generator of FIG. 1 using a Fabry-Perot Laser Diode (FP-LD) or a Reflective Semiconductor Optical Amplifier (RSOA) for injection locking. ) Is a configuration diagram applied to wavelength division multiple passive optical network based on.

Referring to FIG. 6, the wavelength division multiple passive optical network of the present invention uses an erbium-doped optical fiber ASE-based supercontinuum light source 101 as a light source in a central base station 100. That is, the erbium-doped optical fiber ASE-based supercontinuum light source 101 is used as an uplink signal and a downlink signal for transferring data between the central base station 106 and the subscriber network 400.

6, the erbium-doped fiber ASE-based supercontinental light source 101 is an arrayed waveguide grating (AWG) in a remote node via a circulator 103 and a 25Km single mode fiber. The signal is divided into a plurality of wavelengths at 300 and is loaded with data from each transmitter (FP-LD or ROSA, 401, 402, 403) of the subscriber network (ONUs, 400) and reflected to be an uplink signal sent to the central base station 100. . Since the erbium-doped optical fiber ASE-based supercontinuum light source 101 has high power, ultra-broadband, polarization insensitive, and continuous wave characteristics, Injection- Possible as a light source for locking.

FIG. 7 is a detailed embodiment of FIG. 6, in which a light source generated by a broadband light source generator is a Fabry-Perot Laser Diode (FP-LD) or a reflective semiconductor optical amplifier for injection locking. This is a configuration applied to the wavelength division multiple passive optical network based on Semiconductor Optical Amplifier (RSOA).

Referring to FIG. 7, the wavelength division multiple passive optical network for injection-locking according to the present invention includes a central base station 100, a single mode optical fiber 200, a cyclic AWG 300 of a local station, and a subscriber network 400. In particular, the light source used in the central base station 100 uses an erbium-added optical fiber ASE-based supercontinuum light source 101.

As shown in FIG. 4, the supercontinental light source 101 has a wavelength band of about 1510 nm to 1650 nm, which is a wavelength division multiplexer (WDM) 102. -band, L-band, U-band). That is, as shown in Figure 9, the C-band light source is a wavelength band of about 1530 ~ 1565nm, the L-band light source is a wavelength band of about 1565 ~ 1610nm, the U-band light source is a wavelength band of about 1610 ~ 1650nm.

The split wavelength is transmitted through the 50:50 coupler 103 to the C-band light source to the central base station 100 and the L-band light source to the subscriber network 400. The C-band light source is divided in the cyclic AWG 105 and is a downlink signal which is loaded with data from the transmitter (FP-LD or RSOA) 106 of the central base station 100 and reflected to the subscriber network 400. The L-band light source is divided in the cyclic AWG 300 of the local station through the 25Km single mode optical fiber 200, and loads and reflects data from each transmitter (FP-LD or RSOA, 401) of the subscriber network 400 to the center. It becomes an uplink signal sent to the base station 100. On the other hand, the U-band light source is a light source for monitoring whether the transmitted signal is operating normally.

Conventionally, the light source of the C-band and the light source of the L-band are separately input and input, but the present invention divides the supercontinent light source 101 based on the erbium-doped fiber ASE, which is one ultra-wide band, respectively, and respectively an uplink signal and a downlink signal. It generates a monitoring signal and is used for wavelength division multiple passive optical network for injetion-locking.

FIG. 8 is a further embodiment of FIG. 6, in which a light source generated by the broadband light source generator is a Fabry-Perot Laser Diode (FP-LD) or a reflective semiconductor optical amplifier for injection locking. This is another configuration applied to wavelength division multiple passive optical network based on Reflective Semiconductor Optical Amplifier (RSOA).

Referring to FIG. 8, the configuration of FIG. 8 is the same as that in FIG. 7, except that the C-band light source and the L-band light source are switched so that the L-band light source is the central base station 100 and the C-band light source is the subscriber network. Is passed to 400. The L-band light source is divided in the cyclic AWG 105, and is a downlink signal which is loaded with data from the transmitter (FP-LD or RSOA) 106 of the central base station 100 and reflected to the subscriber network 400. The C-band light source is divided in the cyclic AWG 300 of the local station through the 25Km single mode optical fiber 200 to load and reflect the data from each transmitter (FP-LD or RSOA, 401) of the subscriber network 400, It becomes an uplink signal sent to the base station 100. On the other hand, the U-band light source is a light source for monitoring whether the transmitted signal is operating normally.

The present invention overcomes the limitations of the limited bandwidth and low output light intensity of the conventional erbium-doped optical fiber ASE-based non-coherent broadband light source, and has a high power broadband having a bandwidth of more than 100 nm and an output light intensity of more than 100 mW. By generating a light source of the simple configuration with the light sensor or wavelength division multiple passive optical network can be effectively applied.

Claims (12)

An ultra-wideband light source generator characterized by converting a high power, non-coherent amplified self-emitting (ASE) light source from an erbium-doped fiber into a high power ultra-wideband light source using a nonlinear phenomenon on a high nonlinear fiber. An erbium-doped optical fiber that receives the first pumped light and outputs an amplified self-emitting (ASE) seed light source having no coherence; An optical fiber amplifier which is forward-pumped by the second pumping light or reverse-pumped by the third pumping light, or bi-directionally pumped to amplify and output a seed light source input from the erbium-doped optical fiber; And And a non-linear optical fiber for converting the amplified light source received from the optical fiber amplifier into an ultra-wide band light source using a non-linear phenomenon. The method of claim 2, And a first isolator for suppressing the occurrence of a lasing phenomenon between the erbium-doped optical fiber and the optical fiber amplifier to produce a narrow band optical coherence laser output. The method of claim 3, wherein And a second isolator for suppressing the occurrence of a lasing phenomenon between the optical fiber amplifier and the high nonlinear optical fiber and outputting a narrow-band optical coherent laser output. The method of claim 4, wherein The optical fiber amplifier is an erbium-doped fiber amplifier or a rare earth-added fiber amplifier. The method of claim 2, The high nonlinear optical fiber, An ultra-wideband light source generator characterized in that it is selected from silica based high nonlinear distributed transition optical fiber, photonic crystal optical fiber (PCF), bismuth nonlinear fiber and chalcogenide fiber. An erbium-doped optical fiber that receives the first pumped light and outputs an amplified self-emitting (ASE) seed light source having no coherence; An optical fiber amplifier which is forward pumped by the second pumping light and backward pumped by the third pumping light, and amplifies and outputs a seed light source input from the erbium-doped optical fiber; A high nonlinear optical fiber converting the amplified light source received from the optical fiber amplifier into an ultra-wide band light source using a nonlinear phenomenon; A multi-wavelength filter for dividing the ultra-wide band light source into a multi-wavelength signal; A modulator for data modulating the multi-wavelength signal; A single mode optical fiber in which the modulated multi-wavelength signal is transmitted; And And a demultiplexer for demultiplexing the transmitted multi-wavelength signal. In a wavelength division multiple passive optical network based on a Fabry-Perot Laser Diode (FP-LD) or a Reflective Semiconductor Optical Amplifier (RSOA) for Injection Locking, A wavelength division multiple passive optical network using an erbium-doped optical fiber ASE-based supercontinuum light source as the injection locking light source. Based on Fabric-Perot Laser Diode (FP-LD) or Reflective Semiconductor Optical Amplifier (RSOA) for injection locking to send and receive data between the central base station and the subscriber network In a wavelength division multiple passive optical network of The central base station, Supercontinental light source based on erbium-doped fiber ASE; A wavelength division multiplexer for dividing the supercontinental light source into a plurality of wavelength bands; And And a coupler for transmitting the divided wavelengths to the central base station or the subscriber network. C-band light sources of 1530 nm to 1565 nm among the super-continuum light sources divided into the plurality of wavelengths are used as an injection-locking light source for generating a downlink signal existing in the central base station. L-band light sources of 1565 nm to 1610 nm among the supercontinentium light sources divided into the plurality of wavelengths are used as an injection-locking light source for generating an uplink signal existing in the subscriber network. . The method of claim 9, The U-band light source of 1610 nm or more among the super-continuum light sources divided into the plurality of wavelengths is used as a monitoring signal for checking whether the light sources are operating normally. Based on Fabric-Perot Laser Diode (FP-LD) or Reflective Semiconductor Optical Amplifier (RSOA) for Injection Locking to send and receive data between the central base station and the subscriber network In a wavelength division multiple passive optical network of The central base station, Supercontinental light source based on erbium-doped fiber ASE; A wavelength division multiplexer for dividing the supercontinental light source into a plurality of wavelength bands; And And a coupler for transmitting the divided wavelengths to the central base station or the subscriber network. C-band light sources of 1530 nm to 1565 nm among the supercontinentium light sources divided into the plurality of wavelengths are used as an injection-locking light source for generating an uplink signal existing in the subscriber network. L-band light sources of 1565 nm to 1610 nm among the supercontinentium light sources divided into the plurality of wavelengths are used as an injection-locking light source for generating a downlink signal existing in the central base station. . The method of claim 11, The U-band light source of 1610 nm or more among the super-continuum light sources divided into the plurality of wavelengths is used as a monitoring signal for checking whether the light sources are operating normally.

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