KR100319981B1 - Optical-source generator - Google Patents

Abstract

The present invention uses a consumable reverse amplified light generated in the optical amplification optical fiber for the long wavelength band to accommodate a light source of the general signal band 1530nm to 1560nm and a light source of the long wavelength band 1570nm to 1610nm, and a general signal band and a long wavelength band A light source generation device capable of generating and outputting light sources in the range of 1530 nm to 1610 nm, respectively, comprising: a wavelength division multiplexer for applying pumping light applied from a pumping laser diode to an optical amplifying fiber, and an optical amplifying fiber In a light source generating device comprising a long wavelength band optical amplification optical fiber having a high output gain of long wavelength band by generating excitation of rare earth ions doped to the optical amplification optical fiber by pumping light to generate a predetermined natural light. The amplified light of the first wavelength band amplified and output from the optically amplified optical fiber is received and the amplified light is converted into a predetermined ratio. The first splitter outputs the first light source through the first output stage and outputs amplified light to the second output stage, and splits the wavelength of the reverse amplified light of the second wavelength band generated at the input stage of the optical amplified optical fiber. A second input for splitting the reverse amplified light into a predetermined ratio and outputting the reverse amplified light to a first output stage and a second output stage, and applying the light applied from the first output stage to the optical amplifying fiber through the wavelength division multiplexer; Coupler, coupled to the first output end of the second coupler, re-entry means for re-injecting the reverse amplified light applied from the second coupler through the first output end, coupled to the second output end of the second coupler, the second A third coupler for dividing the reverse amplified light applied from the coupler by a predetermined ratio and outputting it to the second light source through the first output terminal; Coupled to the second output terminal of the first coupler and the second output terminal of the third coupler, the first wavelength band light applied from the second output end of the first coupler and the second wavelength band light applied from the second output end of the third coupler; And a fourth coupler for synthesizing and outputting a third light source.

Description

Light source generator {Optical-source generator}

The present invention relates to a light source generating apparatus, and in particular, a light source having a general signal band of 1530 nm to 1560 nm and a long wavelength band of 1570 nm to 1610 nm by using consumable reverse amplified light generated in a long wavelength band optical amplified optical fiber. A light source generation device capable of generating and outputting light sources having a band of 1530 nm to 1610 nm respectively accommodating a signal band and a long wavelength band.

As is well known, optical communication technology is mainly used for information communication between countries through a submarine cable since it is possible to transmit a large amount of information at high speed and there is no signal interference or crosstalk due to electromagnetic induction.

On the other hand, the development of optical communication technology is an optical amplification fiber that can increase the signal gain in the optical signal form itself in the optical path without making physical changes such as temporarily converting the optical signal into an electrical signal for amplification of the signal. In recent years, WDM (Wavelength Division Multiplexing) technology has been developed and used to improve the transmission efficiency of a line by simultaneously transmitting optical signals having different wavelengths through a single transmission line. It's getting mad.

In addition, in the wavelength division multiplexing system using the wavelength division multiplexing technique, a method of transmitting multiple signals simultaneously by separating signal light of a predetermined wavelength band at an interval of about 0.8 nm has been used, and various light used in such a wavelength division multiplexing system. In order to understand the exact characteristics of the components, a light source generator for generating light in a wavelength band used in an optical communication system is required.

1 is a block diagram showing the internal configuration of a general light source generating apparatus.

In Fig. 1, pumping light output through the pumping laser diode 1, for example, pumping light in the 980 nm band is applied to the optical amplifying optical fiber 3 through the wavelength division multiplexer 2, and the optical amplifying optical fiber 3 Is generated by the pumping light applied from the wavelength division multiplexer (2) is output to the isolator (4), the optical amplified optical fiber (3) according to the length of the optical amplified optical fiber (3) It generates a natural emission light having an output characteristic such as 2.

That is, as shown in FIG. 2, the optical gain of the optical amplified optical fiber 3 varies according to the wavelength band according to the length of the optical amplified optical fiber 3, and as the length of the optical amplified optical fiber 3 becomes longer. The gain in the long wavelength band is large. For example, when the length of the optical amplified fiber is 21m, the gain characteristic is large in the 1530-1560nm wavelength band as shown in Fig. 2A, and when the length of the optical amplified fiber is 100m, As shown in 2B, the gain becomes large in the 1570-1610 nm wavelength band.

However, as communication technology gradually develops, there is a limit in transmitting signals through a general signal band of 1530 nm to 1560 nm. Recently, efforts to transmit signals using long wavelength bands of 1560 nm or more have been attempted. Research on optical components such as mixing or separating signal light of the general signal band and the long wavelength band has been expanded.

As a result, as described above, light source generators for general signal bands and light source generators for long wavelength bands have been separately developed and mass-produced using the characteristics of the wavelength bands amplified according to the length of optically amplified optical fibers. There is no device for generating light sources in the range of 1530 nm to 1610 nm, and broadband light sources are synthesized by combining a light source output from the above-described general signal band light source generator and the long wavelength band light source generator through a coupler to generate a wide band light source. There may be a way to generate, but this is because the economic burden is increased by having a separate device, there is a problem that causes the enlargement of the device by combining the two devices.

Accordingly, the present invention, in view of the above circumstances, using the consumable reverse amplified light generated by the pumping light flowing into the optical amplification fiber, the band 1530nm to 1560nm, the general signal band, and 1570nm to the long wavelength signal band It is an object of the present invention to provide a light source generating apparatus capable of generating and outputting light sources in the 1610 nm band and the 1530 nm to 1610 nm band respectively accommodating the general signal band and the long wavelength signal band.

1 is a block diagram showing the internal configuration of a general light source generating apparatus.

Figure 2 is a view showing the amplification characteristics of the optical amplified optical fiber shown in FIG.

Figure 3 is a block diagram showing the internal configuration of a light source generating apparatus according to a first embodiment of the present invention.

Figure 4 is a block diagram showing the internal configuration of a light source generating apparatus according to a second embodiment of the present invention.

5 is a view showing the characteristics of the optical fiber Bragg grating 20 shown in FIG.

*** Explanation of symbols for the main parts of the drawing ***

10: pumping laser diode, 11: wavelength division multiplexer (WDM),

12 optically amplified optical fiber, 13: first isolator,

14: first coupler, 15: second coupler,

16: circulator, 17: second isolator,

18: third coupler, 19: fourth coupler,

20: Fiber Bragg grating.

The light source growth growth value according to the present invention for realizing the above object is provided with a wavelength division multiplexer for applying the pumping light applied from the pumping laser diode to the optical amplification fiber, and in the optical amplification fiber, the optical amplification fiber by the pumping light A light source generating apparatus comprising a long wavelength band optical amplification optical fiber having a high output gain of a long wavelength band by exciting a rare earth ion doped to the device to generate a predetermined natural light, and outputting an amplified output from the optical amplification optical fiber. A first coupler for receiving the amplified light of the first wavelength band to be divided into a predetermined ratio and outputting the amplified light to a first light source through a first output terminal, and outputting amplified light to a second output terminal, and the optical amplified optical fiber The reverse amplified light of the second wavelength band generated from the input terminal of the input signal is received through the wavelength division multiplexer. A second coupler for dividing the output into a first output stage and a second output stage, and applying the light applied from the first output stage to the optical amplified optical fiber through the wavelength division multiplexer; and a first output stage of the second coupler. A re-entry means coupled to the second amplified coupler for reinjecting the reverse amplified light applied from the second coupler through a first output stage, and a reverse amplified light applied to the second output coupler at a predetermined ratio; A split coupler outputs the second light source through the first output stage and is output to the second output stage, and is coupled to the second output terminal of the first coupler and the second output terminal of the third coupler. And a fourth coupler for synthesizing the first wavelength band light applied from the second output terminal of the second wavelength band light applied from the second output terminal of the third coupler and outputting a third light source. Characterized in that configured.

That is, according to the above, the general signal band light source of 1530nm to 1560nm, the long wavelength band light source of 1570nm to 1610nm, and the broadband light source of 1530nm to 1610nm are respectively used by the consumable reverse amplified light generated in the long wavelength band optical amplification optical fiber. It is possible to implement a light source generation device that can be generated.

Next, an embodiment according to the present invention will be described with reference to the accompanying drawings.

3 is a block diagram showing an internal configuration of a light source generating apparatus according to a first embodiment of the present invention.

In the drawing, the pumping light P output from the pumping laser diode 10 is coupled to the input of the wavelength division multiplexer 11, and the light input from the wavelength division multiplexer 11 receives the optical amplification optical fiber (EDF). 12), wherein the pumping light P in the optical amplification fiber 12 excites a rare-earth ion doped in the optical amplification fiber 12 to a predetermined wavelength. Induced photons are generated, and naturally generated light is generated by the generated photons.

On the other hand, in general, as shown in Figure 2, the optical amplified optical fiber has a characteristic that the wavelength band showing a high amplification gain is shifted to a long wavelength band as the length of the optical amplified optical fiber is increased, in the present invention By controlling the length of the optical amplification optical fiber 12, the optical amplification optical fiber 12, which is amplified by the long wavelength signal band, that is, 1570 nm to 1610 nm band by the pumping light, is used.

Subsequently, the long wavelength band light amplified and output through the long wavelength band optical amplification optical fiber 12 is coupled to the input of the first coupler 14 through the first isolator 13, and in the first coupler 14, The long wavelength band light applied from the one isolator 13 is divided into a predetermined ratio, for example, 50:50, and outputs a light source having a long wavelength band light of 1570 nm to 1610 nm, and is applied to the input of the fourth coupler 19.

On the other hand, as described above, the optical amplification fiber 12 has a wavelength band that is amplified according to its length, and thus, at the input end of the optical amplification fiber 12, a general signal band, that is, as shown in FIG. In addition to amplifying the 1530 nm to 1560 nm band light, the light propagated in the reverse direction of the 1530 nm to 1560 nm band amplified at the input terminal of the optical amplification fiber 12 is applied to the input of the wavelength division multiplexer 11.

In the wavelength division multiplexer 11, the reverse amplified light applied from the optical amplified fiber 12 is applied to the input of the second coupler 15.

In the second coupler 15, the reverse amplified light applied from the wavelength division multiplexer 11 is divided into a predetermined ratio, for example, 50:50, through the circulator 16 and the second isolator 17. Are applied to each input.

The third coupler 18 divides the reverse amplified light applied from the second isolator 17 into a predetermined ratio, for example, 50:50, and outputs a light source having a band of 1530 nm to 1560 nm, which is the reverse amplified light, and the fourth coupler ( It is applied to the input of 19).

On the other hand, in the circulator 16, the reverse amplified light applied from the second coupler 15 is again applied to the input of the second coupler 15. In the second coupler 15, the circulator 16 The applied reverse amplified light is reapplied to the input of the optical amplified fiber 12 through the wavelength division multiplexer 11. In this case, the reverse amplified light reapplied from the circulator 16 to the optical amplified fiber 12 is used as the second pumping light of the optical amplified fiber 12, so that the long wavelength band light is amplified and output from the optical amplified fiber 12 In addition, the amplification gain of the band light of 1570 nm to 1610 nm is improved.

In addition, long wavelength band light (1570 nm to 1610 nm) amplified and output through the optical amplified optical fiber 12 is divided into a predetermined ratio through the first coupler 14 and applied to the first input of the fourth coupler 19. The reverse amplified light (1530nm to 1560nm) of the optical amplification optical fiber 12 is divided into a predetermined ratio through the third coupler 17 and applied to the second input of the fourth coupler 19. The fourth coupler 19 In the present invention, a long wavelength band light (1570 nm to 1610 nm) applied from the first coupler 14 and a reverse amplified light (1530 nm to 1560 nm) applied from the third coupler 18 are synthesized to provide light of a broadband light source, that is, a band of 1530 nm to 1610 nm. Will generate and print.

On the other hand, Figure 4 shows the internal configuration of the broadband light source generating apparatus according to a second embodiment of the present invention, the same reference numerals for the parts performing the same function as the device shown in Figure 3 and the detailed description Omit.

That is, in FIG. 4, the pumping light P output from the pumping laser diode 10 is applied to the optical amplifying fiber 12 to convert the reverse amplified light generated in the 1530 nm to 1560 nm band through the wavelength division multiplexer 11. The second coupler 15 is applied, and the second coupler 15 divides the reverse amplified light applied from the wavelength division multiplexer 11 by a predetermined ratio, and divides the optical amplifier with the optical fiber Bragg grating 20 and the 50:50. Each of the two isolators 17 is applied. The reverse amplified light applied to the second isolator 17 is configured to output 1530 nm to 1560 nm band light through the third coupler 18.

On the other hand, the optical fiber Bragg grating 20 exhibits the characteristics as shown in FIG.

That is, as shown in Fig. 5, the optical fiber Bragg grating 20 exhibits a transmission characteristic that its transmittance rapidly decreases in the wavelength range of λa to λa ', and thus the opaque wavelength of the optical fiber Bragg grating, that is, the reflected wavelength band. Can be easily set at the time of manufacture. In general, the long-amplification optical fiber for long wavelength band outputs the long wavelength band light having the best output gain when the pumped light is 1550 nm band. It is preferable to configure the optical fiber Bragg grating 20 that can reflect only the wavelength of the 1550 nm band having the best amplification efficiency.

According to the above embodiment, a long wavelength band light source of 1570 nm to 1610 nm is generated through the optical amplification fiber for the long wavelength band, and consumable reverse amplification light of the general signal band (1530 nm to 1560 nm) generated at the input terminal of the optical amplification fiber is extracted. In addition to generating a general signal band light source, the long wavelength band light source and the general signal band light source can be synthesized to generate a broadband light source of 1530 nm to 1610 nm.

In addition, by re-injecting the reverse amplified light of the general signal band generated at the input terminal of the optical amplification fiber, that is, by applying to the long amplification optical fiber for the long wavelength band through the circulator or fiber Bragg grating, thereby It is possible to improve the output gain of the long wavelength band light source amplified and output from the amplified optical fiber.

Therefore, by using the consumable reverse amplification light generated in the long wavelength band optical amplification fiber, a general signal band light source of 1530 nm to 1560 nm, a long wavelength band light source of 1570 nm to 1610 nm, and a broadband light source of 1530 nm to 1610 nm, respectively. You can implement the generator.

On the other hand, the present invention is not limited to the above embodiments and can be modified in various ways without departing from the technical spirit of the present invention.

As described above, according to the present invention, the general signal band light source of 1530 nm to 1560 nm, the long wavelength band light source of 1570 nm to 1610 nm, and the broadband band of 1530 nm to 1610 nm are used by using the consumable reverse amplification light generated in the long wavelength band optical amplification optical fiber. It is possible to implement a light source generating device capable of generating each light source.

Claims (5)

In order to apply the pumping light applied from the pumping laser diode to the optical amplification fiber, a wavelength division multiplexer is provided, and in the optical amplification fiber, the rare earth ion doped to the optical amplification fiber by the pumping light excites a predetermined natural light. In the light source generating apparatus having a long amplified optical fiber for outputting a long wavelength band, the output of the long wavelength band of high output, Receiving amplified light having a first wavelength band amplified and output from the optical amplified fiber, splitting the amplified light into a predetermined ratio and outputting the amplified light to a second output terminal through a first output terminal; With the coupler, Receiving the reverse amplified light of the second wavelength band generated at the input terminal of the optical amplified fiber through the wavelength division multiplexer and dividing the reverse amplified light by a predetermined ratio and outputting the reverse amplified light to the first output terminal and the second output terminal, respectively; A second coupler for applying light applied from one output terminal to the optical amplified optical fiber through the wavelength division multiplexer; Re-entry means coupled to the first output end of the second coupler, for re-injecting the reverse amplified light applied from the second coupler through the first output end, A third coupler coupled to a second output end of the second coupler, dividing the reverse amplified light applied from the second coupler by a predetermined ratio and outputting the second light source to the second light source through the first output end; , Coupled to the second output terminal of the first coupler and the second output terminal of the third coupler, the first wavelength band light applied from the second output end of the first coupler and the second wavelength band light applied from the second output end of the third coupler; And a fourth coupler for synthesizing and outputting the third light source. The method of claim 1, The re-incident means is a light source generating device, characterized in that consisting of a circulator. The method of claim 1, The re-incident means is a light source generating device, characterized in that consisting of the optical fiber Bragg grating. The method of claim 3, wherein And a reflection wavelength band of the optical fiber Bragg grating is set to 1550 nm band. The method of claim 1, The optical amplification optical fiber is a light source generation device, characterized in that the long wavelength band optical amplification optical fiber for amplifying a long wavelength band of 1570nm to 1610nm band.