KR20170013059A - Miniaturized optical fiber amplifier - Google Patents
Miniaturized optical fiber amplifier Download PDFInfo
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- KR20170013059A KR20170013059A KR1020150105923A KR20150105923A KR20170013059A KR 20170013059 A KR20170013059 A KR 20170013059A KR 1020150105923 A KR1020150105923 A KR 1020150105923A KR 20150105923 A KR20150105923 A KR 20150105923A KR 20170013059 A KR20170013059 A KR 20170013059A
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- laser diode
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- optical fiber
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
- H01S3/06754—Fibre amplifiers
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/09—Processes or apparatus for excitation, e.g. pumping
- H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
- H01S3/094—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light
- H01S3/094042—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light of a fibre laser
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/10007—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating in optical amplifiers
- H01S3/10015—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating in optical amplifiers by monitoring or controlling, e.g. attenuating, the input signal
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Optics & Photonics (AREA)
- Lasers (AREA)
Abstract
Description
BACKGROUND OF THE
In order to cope with the rapidly increasing optical communication capacity, the capacity of the communication network has been increased and the optical fiber connection to the subscriber level has been actively developed. In such a system, the optical amplifier is a very important device to compensate for the loss caused by long-distance transmission or the insertion of components.
An erbium-doped fiber amplifier (EDFA) is mainly used as such an optical amplifier.
1 is an internal structural view of a conventional optical fiber amplifier (EDFA).
The conventional optical fiber amplifier (EDFA) having such a structure has the following problems.
The loss-of-signal (LOS) alarm generation condition of a conventional optical fiber amplifier (EDFA) is an input that is smaller than a specific input power. When an input that is smaller than a certain input power is received, an LOS alarm is generated to alert the system that a problem has occurred in the optical transmitter section.
1), an input monitor PD (7 in FIG. 1), a PD (Printed Board Assembly) in the optical splitter (PD) for implementing the LOS alarm in the conventional optical fiber amplifier (Not shown), an electric signal amplifying unit (not shown), an A / D converter (not shown), and a noise control unit (not shown). However, placing all of these devices increases the space for device placement and increases the size of the optical fiber amplifier due to the addition of a pattern on the PBA to connect the devices.
On the other hand, in the conventional optical fiber amplifier, it is difficult to adapt the position of the input monitor PD or the position of the input monitor PD when designing the PBA of the input monitor PD according to the size of the product and the requirement of the user.
In addition, incompatibility increases the cost of product design development and takes a lot of time for design verification.
Hereinafter, another problem in the conventional optical fiber amplifier (EDFA) will be described.
The APC (Automatic Power Control) function of a conventional optical fiber amplifier (EDFA) outputs a constant output power regardless of input light. The APC function uses a feedback control method of controlling the
In order to implement and design the APC function in the conventional optical fiber amplifier (EDFA) as described above, the output distributor (6 in Fig. 1), the output monitor PD (9 in Fig. 1) and the PD 9 (Not shown), an electric signal amplifying unit (not shown), an A / D converter (not shown), and a noise control unit. However, placing all of these devices increases the space for device placement and increases the size of the optical fiber amplifier due to the addition of a pattern on the PBA to connect the devices.
Meanwhile, in the conventional optical fiber amplifier, depending on the size of the product and the requirement of the user, the PD used in accordance with the optical power input to the PD must be used differently based on the arrangement and output power of the output monitor PD. Further, since it is difficult to apply the position of the output monitor PD in the PBA design in a compatible manner, there is a problem that it is required to be disposed at a completely different position.
In addition, incompatibility increases the cost of product design development and takes a lot of time for design verification.
It is an object of the present invention to provide a miniaturized optical fiber amplifier that is smaller in size than an existing optical fiber amplifier, and easily implements an LOS alarm function and an APC function.
In order to achieve the above object, a miniaturized optical fiber amplifier according to a preferred embodiment of the present invention includes: a pumping laser diode for applying pumping light for amplifying incident signal light; A wavelength division multiplexing coupler coupling the incident signal light and the pumping light; An optical signal amplifying medium for amplifying the optical signal from the wavelength division multiplexing coupler and sending the amplified optical signal to an output terminal; And an output monitor unit monitoring an optical signal applied to the output terminal, wherein an input monitor unit for monitoring the incident signal light applied to an input terminal is removed.
The optical fiber amplifier may implement a loss-of-signal (LOS) alarm function based on the current change rate of the pumping laser diode.
The pumping laser diode may be connected to an LOS alarm unit which generates or releases the LOS alarm according to a rate of change of current of the pumping laser diode in a feed back word manner in the absence of an input signal.
The optical fiber amplifier may implement an ALS (Automatic Laser Shutdown) function based on the current change rate of the pumping laser diode.
The pumping laser diode may be connected to an ALS unit that activates or deactivates the ALS function according to a current change rate of the pumping laser diode in a feed back word manner in the absence of an input signal.
The optical signal amplifying medium may be an erbium-doped optical amplifying optical fiber.
The miniaturized optical fiber amplifier according to another preferred embodiment of the present invention includes: an input monitor unit for monitoring an optical signal from an input terminal; A pumping laser diode for applying pumping light for amplifying the signal light incident from the input terminal; A wavelength division multiplexing coupler coupling the incident signal light and the pumping light; And an optical signal amplifying medium for amplifying the optical signal from the wavelength division multiplexing coupler and sending the amplified optical signal to an output terminal, wherein an output monitor for monitoring an optical signal applied to the output terminal is removed.
Wherein the optical fiber amplifier includes an APC for outputting the output power of the pumping laser diode constantly through an amount of an LD bias corresponding to an input monitor value of the input monitor unit and a back facet monitor value of the pumping laser diode, Function can be implemented.
The pumping laser diode obtains an LD bias when the input signal is applied and a slope of the LD BPM (Back PD Monitor), and controls the pumping laser diode so that a constant output power is output through feedforward control through the input monitor And may be connected to the APC unit.
The miniaturized optical fiber amplifier according to another preferred embodiment of the present invention is characterized in that any one of an input monitor unit for monitoring incident signal light applied to an input end and an output monitor unit for monitoring an optical signal applied to an output end is removed .
According to the present invention having such a configuration, only one of the input monitor side and the output monitor side generally used for miniaturization of the optical fiber amplifier is used.
Even if only one monitor side is used, a function equivalent to that of using both monitor sides can be implemented.
In other words, eliminating the existing input monitor side shortens product manufacturing time and improves productivity. Also, by securing the internal space of the product, the product size can be reduced, thereby securing space for installation of the system. In addition, it provides flexibility in product design / development by applying the generation and release function of LOS alarm with the LD Bias change rate when designing similar products.
On the other hand, eliminating the existing output monitor side shortens product manufacturing time and improves productivity. Also, by securing the internal space of the product, the product size can be reduced, thereby securing space for installation of the system. In addition, LD bias can be controlled by input monitoring when designing similar products, pumping LD Bias with feed forward control and monitoring LD BPM values. As a result, it provides flexibility in product design / development by applying a function to control output of constant output power under environmental test conditions.
1 is an internal structural view of a conventional optical fiber amplifier.
FIG. 2 is a view showing the internal structure of the miniaturized optical fiber amplifier according to the first embodiment of the present invention and the connection with the LOS alarm part.
3 is a graph comparing quantitative LD biases for the feed back word scheme in the first embodiment of the present invention.
4 is a graph comparing LD bias for LOS alarm release for the feed back word scheme in the first embodiment of the present invention.
FIG. 5 is a diagram illustrating an internal structure of a miniaturized optical fiber amplifier according to a second embodiment of the present invention and a connection to an APC unit.
6 is a graph comparing a quantitative LD bias and a LD BPM for the feedforward method in the second embodiment of the present invention.
7 is a graph for explaining quantitative LD BPM control for the feedforward method in the second embodiment of the present invention.
8 is a table comparing a conventional optical fiber amplifier with the optical fiber amplifier of the first and second embodiments of the present invention.
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 is to be understood, however, that the invention is not to be limited to the specific embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.
The terminology used in this application is used only to describe a specific embodiment and is not intended to limit the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In the present application, the terms "comprises" or "having" and the like are used to specify that there is a feature, a number, a step, an operation, an element, a component or a combination thereof described in the specification, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.
Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning in the context of the relevant art and are to be interpreted in an ideal or overly formal sense unless explicitly defined in the present application Do not.
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In order to facilitate the understanding of the present invention, the same reference numerals are used for the same constituent elements in the drawings and redundant explanations for the same constituent elements are omitted.
(Embodiment 1)
FIG. 2 is a view showing the internal structure of the miniaturized optical fiber amplifier according to the first embodiment of the present invention and the connection with the LOS alarm unit, and FIG. 3 is a diagram showing the internal structure of the miniaturized optical fiber amplifier according to the first embodiment of the present invention. FIG. 4 is a graph comparing the LD bias for canceling the LOS alarm for the feed back word method in the first embodiment of the present invention.
The miniaturized optical fiber amplifier according to the first embodiment of the present invention includes a
The
The wavelength division multiplexing coupler (WSC) 24 combines the light having passed through the
The optical
The
The optical branching
The pumping
The output
In Fig. 2,
The miniaturized optical fiber amplifier of the first embodiment as described above removes the optical parts, the electric parts and the circuit of the input monitor part among the parts constituting the optical fiber amplifier as compared with the conventional one. That is, it can be seen that the first optical branching
In other words, the quantitative value of the LD Bias at the operating input condition for outputting a constant output power of the optical fiber amplifier corresponds to the solid line (L1) in FIG. At this time, the
When an LOS alarm occurs, the output power is controlled to operate at Mute Power (Output Power = 0dBm). Thereafter, when an input signal is input, a lower current is applied in comparison with the LD Bias when there is no input signal (see L6 in FIG. 4). In this way, the ratio of the LD Bias according to the presence or absence of the input signal in the mute power state is compared and judged. Accordingly, when the pumping
Although the pumping
As described above, according to the first embodiment of the present invention, productivity can be improved by shortening the production time of the product by removing the existing input monitor side. Also, by securing the internal space of the product, the product size can be reduced, thereby securing space for installation of the system. In designing similar products, it is possible to provide flexibility in product design / development by applying the generation and release function of LOS alarm with the change rate of LD Bias.
(Second Embodiment)
FIG. 5 is a view showing an internal structure of a miniaturized optical fiber amplifier according to a second embodiment of the present invention and its connection to an APC unit, and FIG. 6 is a graph showing a quantitative FIG. 7 is a graph illustrating quantitative LD BPM control for the feed forward method in the second embodiment of the present invention. FIG. 7 is a graph comparing LD bias and LD BPM.
The miniaturized optical fiber amplifier according to the second embodiment of the present invention includes a
The optical branching
The
The wavelength division multiplexing coupler (WSC) 46 combines the light having passed through the
The optical
The
The
The pumping
In Fig. 5,
The optical fiber amplifier of the second embodiment as described above removes the optical parts, the electric parts and the circuit of the output monitor part among the parts constituting the optical fiber amplifier as compared with the conventional one. That is, it can be seen that the second optical branching
In other words, in the above-described second embodiment, the quantitative value of the LD Bias in the operation input condition for outputting a constant output power of the optical fiber amplifier may correspond to the first solid line L2 in FIG. 6, and the LD Back PD Monitor BPM) may correspond to the second solid line L3. At this time, LD bias and LD BPM slope when the input signal is applied are obtained, and a pumping
On the other hand, it is important that the optical fiber amplifier is controlled so as to output the output power stably even in the environmental test. Accordingly, in the second embodiment, in order to output a constant output power under environmental test conditions without output monitoring, the pumping
As described above, according to the second embodiment of the present invention, productivity can be improved by shortening the product manufacturing time by removing the existing output monitor side. Also, by securing the internal space of the product, the product size can be reduced, thereby securing space for installation of the system. In addition, LD bias can be controlled by input monitoring when designing similar products, pumping LD Bias with feed forward control and monitoring LD BPM values. Therefore, it is possible to provide flexibility in product design / development by applying a function of controlling output of a constant output power under environmental test conditions.
8 is a table comparing a conventional optical fiber amplifier with the optical fiber amplifier of the first and second embodiments of the present invention.
Conventional optical fiber amplifiers can not support the LOS alarm function and the ALS (Automatic Laser Shutdown) function when the input monitor unit is removed. On the other hand, the optical fiber amplifiers of the first and second embodiments of the present invention can support the LOS alarm function and the ALS function even if the input monitor unit is removed.
Meanwhile, the conventional optical fiber amplifier can not support the APC function when the output monitor unit is removed. On the other hand, the optical fiber amplifiers of the first and second embodiments of the present invention can support APC (Automatic Power Control) even when the output monitor unit is removed.
As described above, an optimal embodiment has been disclosed in the drawings and specification. Although specific terms have been employed herein, they are used for purposes of illustration only and are not intended to limit the scope of the invention as defined in the claims or the claims. Therefore, those skilled in the art will appreciate that various modifications and equivalent embodiments are possible without departing from the scope of the present invention. Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims.
20, 40: Optical fiber
22, 44: a first isolator
24, 46: wavelength division multiplexing coupler
26, 48: Optical signal amplification medium
28, 50: a second isolator
30, 42: optical branching section
32, 54: laser diode for pumping
34: Photodiode for Output Optical Monitor
36: LOS alarm section
38, 58: Optical fiber connection point
52: Photo diode for input optical monitor
Claims (11)
A wavelength division multiplexing coupler coupling the incident signal light and the pumping light;
An optical signal amplifying medium for amplifying the optical signal from the wavelength division multiplexing coupler and sending the amplified optical signal to an output terminal; And
And an output monitor unit for monitoring an optical signal applied to the output terminal,
And an input monitor unit for monitoring the incident signal light applied to an input terminal is removed.
Wherein the miniaturized optical fiber amplifier realizes a loss-of-signal (LOS) alarm function based on a current change rate of the pumping laser diode.
Wherein the pumping laser diode is connected to an LOS alarm unit that generates or releases the LOS alarm according to a rate of current change of the pumping laser diode in a feed back word manner in the absence of an input signal.
Wherein the miniaturized optical fiber amplifier realizes an ALS (Automatic Laser Shutdown) function based on a current change rate of the pumping laser diode.
Wherein the pumping laser diode is connected to an ALS unit for activating or deactivating the ALS function according to a current change rate of the pumping laser diode in a feed back word manner in the absence of an input signal.
Wherein the optical signal amplifying medium is an erbium-doped optical amplifying optical fiber.
A pumping laser diode for applying pumping light for amplifying the signal light incident from the input terminal;
A wavelength division multiplexing coupler coupling the incident signal light and the pumping light; And
And an optical signal amplifying medium for amplifying the optical signal from the wavelength division multiplexing coupler and sending the amplified optical signal to an output terminal,
And an output monitor for monitoring an optical signal applied to the output terminal is removed.
The miniaturized optical fiber amplifier outputs the output power of the pumping laser diode constantly through the amount of LD bias corresponding to the input monitor value of the input monitor unit and the value of the back facet monitor of the pumping laser diode Thereby realizing an APC function for realizing a compact optical fiber amplifier.
The pumping laser diode obtains an LD bias when the input signal is applied and a slope of the LD BPM (Back PD Monitor), and controls the pumping laser diode so that a constant output power is output through feedforward control through the input monitor APC portion of the optical fiber amplifier.
Wherein the optical signal amplifying medium is an erbium-doped optical amplifying optical fiber.
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
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KR101937404B1 (en) | 2017-07-03 | 2019-04-09 | 한화시스템(주) | Hybrid optical fibers amplifier for high power narrow band optical fibers laser |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR19990077909A (en) | 1998-03-18 | 1999-10-25 | 이데이 노부유끼 | Data recording apparatus |
KR20030075295A (en) | 2002-03-18 | 2003-09-26 | 주식회사 네오텍리서치 | An Gain clamped erbium-doped fiber amplifier for long wavelength band |
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JP2007214170A (en) | 2006-02-07 | 2007-08-23 | Fujikura Ltd | Optical fiber amplifier, optical fiber laser device, and fault detection method |
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Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
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KR19990077909A (en) | 1998-03-18 | 1999-10-25 | 이데이 노부유끼 | Data recording apparatus |
KR20030075295A (en) | 2002-03-18 | 2003-09-26 | 주식회사 네오텍리서치 | An Gain clamped erbium-doped fiber amplifier for long wavelength band |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR101937404B1 (en) | 2017-07-03 | 2019-04-09 | 한화시스템(주) | Hybrid optical fibers amplifier for high power narrow band optical fibers laser |
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