TW493305B - Amplitude increasing device for light - Google Patents

Abstract

An amplitude increasing device for light is discloses, which is provided to efficiently amplify the signal light in L bandwidth (with wavelength in 1560 nm to 1610 nm) and obtain larger gains. The device is provided with an excited light source, a light synthesizer and erbium-doped fiber; wherein the excited light source is an excited light source for outputting the excited light; the light synthesizer is to output the input signal light and the excited light; the erbium-doped fiber uses the output of the light synthesizer as the input, and amplifying the signal light to output; wherein the excited light has the wavelength in 1.50 micron to 1.56 micron, and the signal light has the amplified wavelength in 1560 nm to 1610 nm. The product of the density and the line length for the erbium-doped fiber is set at a suitable value to obtain larger gain.

Description

493305 A7 B7 V. Description of the invention (1) [Technical field to which the invention belongs] The present invention is an optical amplifier device for amplifying optical signals used in related communications. (Please read the notes on the back first to write this page) [Know-how] Pressing, using optical fiber as amplifying medium, and a light-enhancing device that amplifies the optical signal is already well known. And the optical fiber adopts erbium-doped fiber (EDF: erbium-doped fiber amplifier), which shows the superior performance of 1 · 5 5 // m-band optical amplifiers. It is generally called EDFA: erbium-doped fiber amplifier. ) 〇 Excitation light having a wavelength of 1.48 // m or 0.98 // m is used in the EDFA. Because it has relatively large absorption in EDF, it is close to the wavelength of signal light in the 1.55 // m band (.1530 nm to 1560 nm) used so far in optical communications, and the wavelength of the degree of absorption of EDF The variation of the value is small. Even if the excitation wavelength is shifted, the amplification characteristics will not change much, especially the excitation light with a wavelength of 1 · 4 4 8 # m is more widely used. Printed by the Intellectual Property Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs In addition, the method of transmitting light of a plurality of wavelengths through a fiber called the wavelength deivsion multipluxing (WDM) is quite remarkable. In W D M propagation, by increasing the number of signal lights of different wavelengths transmitted in the optical fiber, the propagation capacity can be increased. Therefore, it is possible to use a signal wavelength (15660 to 1610nm) which has not been adopted so far, which is commonly referred to as L bandwidth or 1.58 // m bandwidth. This paper size applies the Chinese National Standard (CNS) A4 specification (210X297 mm) · 4-493305 A7 B7 V. Description of the invention (2) [Questions to be solved by the invention] Please read the subject of winter and then fill out this page. The peak ridge of the absorption spectrum of EDF is near 1 · 5 3 // m, and 1 · 4 8 // m is not the peak 値 of the absorption spectrum. Therefore, if an excitation light with a wavelength of 1.48 // m is used in the EDFA, the signal light of the L bandwidth cannot be efficiently amplified. In addition, compared with the case of amplifying the signal light of the 1.55 // m bandwidth, , It must be a very long EDF. The subject of the present invention is to provide a light amplification device that efficiently amplifies the L-band signal light and obtains a larger gain by using excitation light near the wavelength 1 · 5 3 // m that is a peak of the EDF absorption spectrum. . [Methods to solve the problem] The printed matter of the Employee Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs is for the purpose of solving the above-mentioned problems. The organization described in the first patent application scope is an optical amplifier device with an excitation light source, optical multiplexer, and bait. Added optical fiber; the excitation light source is an excitation light source that outputs excitation light; the optical multiplexer is an input signal light and the excitation light and outputs it; the bait addition optical fiber is based on the output of the optical multiplexer as an input, The signal light is amplified and output; wherein the wavelength of the excitation light is in the range of 1.50 // m to 1. 5 6 // m. According to the invention in the first scope of the patent application, because the wavelength near the peak of the EDF absorption spectrum is used as the excitation light, even the excitation light of the same intensity can increase the excitation level in the EDF compared to the case of using other wavelengths. The number of bait ions can greatly improve the amplification efficiency and gain of EDFA. In addition, the invention in item 2 of the scope of patent application applies the Chinese National Standard (CNS) A4 specification (210X297 mm)-5-493305 in the paper size of the patent application model. 5. Description of the invention (3) In the optical amplifier device according to the item 1, the wavelength of the signal light is from 1560 nm to 1610 nm. According to the invention in the second scope of the patent application, a larger gain and power conversion efficiency can be obtained compared with the case of using excitation light with a wavelength of 1 · 48 A m. In addition, the invention of the third scope of the patent application is the relationship between the concentration line long product CL of the bait-added optical fiber and the excitation light intensity P p in the optical amplification device described in the first scope of the patent application. CL (1 / α)

In (P p / ^) (where α and / 3 refer to constants determined according to the wavelength of the excitation light and the intensity of the signal light, respectively). According to the invention in the third scope of the patent application, a larger gain can be surely obtained compared with the case where the excitation light with a wavelength of 1 · 4 8 // m is used. Furthermore, the optical amplification device of the invention in the fourth item of the patent application is provided with an excitation light source, an optical multiplexer, and a bait-added optical fiber; the excitation light source is an excitation light source that outputs the excitation light; The light and the excitation light are outputted; the bait-added optical fiber takes the output of the optical multiplexer as input and amplifies the signal light to output; wherein the wavelength of the excitation light is 1.54 // m ~ 1 · 56 // m, and the concentration line long product of the added fiber of the bait is 60kp pm · m ~ 9 0 kp Pm • m ° According to the invention in the fourth item of the patent application, compared with the wavelength of 1 · In the case of 4 8 // m excitation light, a larger gain can be obtained, and at the same time, the gain variation to the signal wavelength change can be reduced. In addition, the optical amplifier device of the invention in the scope of patent application No. 5 applies to the Chinese paper standard (CNS) A4 (210x297 mm). (Please read the precautions on the back before filling this page)- · ， 11 Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs 493305 A7 __B7____ V. Description of the invention (4) Equipped with excitation light source, optical multiplexer and bait-added optical fiber; the excitation light source is the excitation light source that emits the excitation light; the photosynthesis The waver is an input signal light and the excitation light, and outputs it; the bait addition optical fiber is the one that takes the output of the optical multiplexer as an input and amplifies the signal light to output; among which, the signal light The intensity is above-1 0 d Bm, and the wavelength of the excitation light is 1 · 5 4 // m ~ 1 · 5 5 // m, and the concentration line length product of the added fiber of the bait is 60kppm * m ~ 9〇 kppm * m. According to the invention of claim 5 in the scope of patent application, when the signal light intensity is large, a larger gain can be obtained compared with the case of using the wavelength of 1 · 4 8 // m excitation light. [Implementation Mode of the Invention] Hereinafter, an implementation mode of the present invention will be described in detail with reference to the drawings. Set the input of the constructor. Light X // m # m 激 1 4 is a block diagram printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs. Figure 1 is a block diagram of a light booster related to the implementation of the present invention. The optical amplifier device (hereinafter referred to as "DEFA") shown in FIG. 1 is provided with unidirectional devices 12, 15, optical multiplexers, EDF 14, and 15x // m excitation light source 21. The following x // m means 1.50 // m to 1.56 // m.

Unidirectional devices 1 2 and 1 5 use signal light as their input terminals and output the signal light to the optical multiplexer 1 3 through their output terminals. The 3 multiplexer 1 3 outputs the signal light from the unidirectional device 1 2. It emits light with the output wavelength 1 · 50 // m ~ 1.56 of the excitation light source 21 of 1 5 and multiplexes it and outputs it to EDF14. EDF -7- Please read the 5 notes before filling in this page. The paper size is applicable to the Chinese National Standard (CNS) A4 specification (210X 297 mm) 493305 A7 B7 Printed by the Intellectual Property of the Ministry of Economic Affairs and the Consumer Cooperatives (5) The induced release of bait ions excited by the excitation light is amplified and output in the unidirectional device 15. The signal light that is too large is used as the input of its input terminal. This signal light is used as the E D F A device 1 2 and 1 5 shown in Figure 1. It is not allowed to propagate from the output terminal toward the signal. On the other hand, in EDF A, which is not shown in Figure 1, although the laser oscillates or reflects the reflected light, and it has a single unit, it can operate even if the unidirectional units 12 and 15 are not provided. In addition, although the EDFA shown in Figure 1 is adopted, the forward direction of the same direction of the EDF 1 4 can adopt a structure that excites the excitation light and the signal light from the rear direction of the EDF 1 or the excitation light is excited from both directions by the ED. . In E D F 1 4, the bait ions are released by excitation and induction, and the more signal light ions that are input are amplified, the larger the gain can be obtained. Absorption, because the light with a wavelength of 1.1.56 // m near the peak of the absorption spectrum is greater than the excitation light with a wavelength of 1.48, and the light with a wavelength of 1.50 / // can also be compared with a wavelength of 1. 4 The number of case-level bait ions at 8 // m can increase E and gain in Figure 1. An image appears, the director 15, and the output is input through the input terminal. The signal light is output through the output terminal. The letter in one direction is to remove the EDF 1 4 directors 1 2 and 1 5 and carry out the structure of the optical amplification device that excites the excitation light and the signal light, but also the light incident at the two ends of F 1 4 incident in the opposite direction. And was excited, and. Therefore, the light of the excitation level bait in EDF 1 4 5 0 // m ~ // m, so that m ~ 1. 5 6 // m, can increase the amplification efficiency of excited DFA, please read the meaning on the back Please fill in this page again. The paper size applies the Chinese National Standard (CNS) A4 specification (210X297 mm) -8-493305 A7 B7. Printed by the Consumers ’Cooperative of Intellectual Property Bureau of the Ministry of Economic Affairs. In the EDFA shown in Figure 1, by knowing the excitation light with a wavelength of 1 · 4 8 // m and using light with a wavelength of 1 · 50 // m ~ 1 · 56 // m, you can Get the same effect as increasing the excitation light intensity of 1 · 4 8 // m. In addition, you can also obtain the necessary excitation input (excitation light intensity) for the same size gain. In addition, the wavelength is 1 · 5 0 // m ~ 1 · 5 6 // m. The luminescence is easily absorbed by EDF 1 4 so the length of EDF 1 can be shortened. Below, the EDFA characteristics of the first figure under various conditions are compared, instead of 1 5 X / / m excitation light source 2 1, and the display changes to a wavelength of 1 · 4 8 // m excitation light source (not shown), which excites the wavelength 1 · # m The characteristics when light is supplied to the optical multiplexer "3. In addition, the bait concentration [p pm] of EDF 1 4 and its optical fiber length [m] 'are called the concentration line long product. The unit of the concentration line long product is ppm · 1 0 00p pm · m is expressed as 1 kppm · m. The bait concentration of EDF 14 is about 9,000 ppm. Figure 2 shows the wavelength of EDFA relative to signal wave signal light shown in Figure 1) 1 6 0 Gain of the concentration line long product at 0 nm. In the second figure, ▲ indicates the excitation wavelength (wavelength of the excitation light) 1 · 5 3 # m, signal input (signal light intensity)-1 〇dbm, and the system emits wavelength 1 · 53 // m, signal input-40 dBm, △ system emission wavelength 1 · 48 / zm, signal input-10 dBm, □ system excitation wavelength 1 · 4 8 // m, signal input-4 0 d B m The input is 3l.8rnW. Substitute wavelength reduction) because of 4. The matching number is 4 8, which will be accumulated for a long time. (Please refer to the table of the exciter table. (Please read the precautions on the back * < fill out this page). $ 平 个 ί ί-• y Μ I, 1 493305 A7 B7 V. Description of the invention (7) (Please read the precautions on the back before filling in this page) As shown in Figure 2, when the concentration line length product is optimal, regardless of the size of the input signal, the excitation wavelength is 1 · At 5 3 // m, a larger gain can be obtained than at 1. 8 V m. Figures 3 and 4 show the EDFA relative to the signal wavelength (wavelength of signal light) shown in Figure 1. 1 6 Gain of concentration line long product at 0 0 nm, where Figure 3 is a diagram of the case where the relevant signal is input to 10 d B m, and Figure 4 is a diagram of the case where the relevant signal is input to 4 0 d Bm Figures 3 and 4 are related to the excitation wavelengths at 1.48 // m, 1.535 // m, 1.54 // m, and 1.545 // m.

data. The excitation input is 90 m W when the excitation wavelength is 1 · 4 8 # m, and 85 · 5 m W when the excitation wavelength is 1 · 535 ~ 1 · 55 // m. Although the excitation input is at the excitation wavelength 1 · In the case of 4 8 // m, it is about 0 · 2 d B compared with other cases, but it can be judged that even if the excitation input difference is ignored. In the following figure, the data at the excitation wavelength of 1 · 4 8 // m and the excitation input of 90 m W are compared with the excitation wavelength of 1 · 5 0 // m to 1 · 5 6 // m and the excitation input of 8 5 · The data at 5 m W are shown in the same figure, which shows only the excitation output of 8 5 · 5 m W. Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs from Figures 3 and 4, when the longest product of concentration lines is optimal, regardless of the size of the input signal, the excitation wavelength is 1 · 5 3 5 // m ~ 1 At 55 // m, a larger gain can be obtained than at 1.48 // m. Therefore, when the wavelength of the signal light is in the L bandwidth (1560 nm to 1610 nm), in the EDFA shown in FIG. 1, the wavelength of the excitation light is set to 1.50 // m to 1. 56 // m, it is best to set the paper size to the Chinese National Standard (CNS) A4 specification (210X297 mm): 10.30 ~ 493305 A7 _B7 V. Description of the invention (8) is 1 · 53ym ~ 1 · 55 / / m, and can obtain greater gain than 1 · 48 # m. Figure 5 shows an example of the power conversion efficiency of E D F A shown in Figure 1 with respect to the signal input-10 d B m and the concentration line length product at a signal wavelength of 16 00 nm. The power conversion efficiency is expressed by (signal output / excitation output from EDF) X 1 〇 〇, the larger this value is, the more efficiently the excitation light can be used for signal light amplification. Figure 5 shows the data at the relevant excitation wavelengths 1. 4 8 // m, 1 · 535 // m, 1 · 54 # m, 1 · 545 // m and 1 · 5 5 // m. The excitation input is 85 · 5mW when the excitation wavelength is 1 · 535 ~ 1 · 55 // m, and it is 90mW when the excitation wavelength is 1 · 4 8 # m. It can be seen from Fig. 5 that, depending on the excitation wavelength, the length product of the concentration line with the highest power conversion efficiency will be different. Change the excitation input from 9 · 5 m W to 8 5 · 5 m W, and draw a graph as shown in Figure 5. For each excitation wavelength, find the concentration at which the highest power conversion efficiency can be obtained from the obtained data Line length product, the result is 30kppm.m when the excitation wavelength is 1 · 4 8 // m, 60 kppm when the excitation wavelength is 1 · 535 // m, m, and 80 kppm when the excitation wavelength is 1 · 54 // m · !!!, 70 kppm · !!! when the excitation wavelength is 1.545 // m, and 70 kppm · ιη when the excitation wavelength is 1.55 // m. Figure 6 shows the longest product of the concentration line that can obtain the highest power conversion efficiency at each excitation wavelength as described above. Figure 1 of the relative excitation wavelength This paper size applies the Chinese National Standard (CNS) A4 specification (210X297) Li) -11-(Please read the precautions on the back before filling out this page) • Installed · Printed by the Intellectual Property Bureau of the Ministry of Economic Affairs and Consumer Cooperatives 493305 A7 B7_ V. Description of the invention (9) EDFA power conversion efficiency chart . The signal wavelength is 16 〇 0 n m ′ (Please read the precautions on the back before filling this page) The signal input is 1 〇 d B m. But 'Because it is limited by the data obtained from the measurement, the concentration line length product is less than 30 kppm · m at the excitation wavelength 1 · 4 8 // m, and greater than 6 0 at the excitation wavelength 1 · 5 3 5 # m When the concentration line of kppm · m is long product, there is a possibility of obtaining the highest power conversion efficiency. Figure 6 does not refer to the power conversion efficiency obtained at the excitation wavelength of 1 · 4 8 # πί, at most about 10%. In contrast, at the excitation wavelength of 1 · 5 4 // m ~ 1 · 5 5 // The power conversion efficiency obtained at m is at most about 20%. In addition, even when the excitation wavelength is 1 · 5 3 5 // m, the power conversion efficiency is about 15% at most. Therefore, when the wavelength of the signal light belongs to the L bandwidth, in the EDFA shown in FIG. 1, the wavelength of the excitation light is set to 1 · 5 0 // m ~ 1 · 56 # m, and preferably 1 · 535 // m ~ 1 · 55 // m, it can obtain greater power conversion efficiency than when the wavelength of the excitation light is 1 · 4 8 // m. Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs. Figure 7 shows the power conversion efficiency chart of Figure 1 E D F A relative to the excitation input. The length product of the concentration lines in each excitation wavelength has the same settings as in Fig. 6. The signal wavelength is 16 00 nm and the signal input is-10 dBm. The excitation input is 8 5 ♦ 5mW when the excitation wavelength is 1 · 535 ~ 1 · 55 // m, and 90 ni W when the excitation wavelength is 1 · 48 // m. From Fig. 7, the power conversion efficiency at the excitation wavelength of 1 · 4 8 β m is about 10% at most, and the excitation wavelength of 1 · 5 3 5 ~ 1 · 5 5 is applicable to the Chinese National Standard (CNS) A4. Specifications (210X297 mm) -12-— 493305 A7 B7 V. Description of the invention (1Q) // The power conversion efficiency is at most 20% at m, and when the excitation wavelength is 1 · 535 ~ 1 · 55 // m, the If the excitation input is set to greater than 85.5 mW, you can predict that greater power conversion efficiency can be obtained. Please read the precautions before filling in this page. Figure 8 shows the EDFA in Figure 1, One of the examples of the combination of the concentration line long product and the excitation input that can obtain a greater gain than the case where the excitation wavelength is 1 · 5 4 // m is obtained. Signal input—10dBm, signal wavelength is 1600nm. Figure 8 shows that, for example, when the length product of the concentration line is 40 kp pm · m, the gain at the excitation wavelength 1 · 4 8 // m and the gain at the excitation wavelength 1 · 5 4 gm are about the same as the excitation input. It is the same at 3 4 m W, and if the excitation input is lower than this, the gain of the excitation wavelength 1.5 4 // m will be larger. Similarly, even for other excitation wavelengths (1.535 // m, 1.545 // m, 1.55 // m), the excitation input range when the gain is greater than the excitation wavelength 1 · 4 8 // m can be obtained. Figures 9 and 10 printed by the employee consumer cooperative are obtained according to this condition. The conditions for obtaining a greater gain at the excitation wavelength of 1 · 5 X // m than at the excitation wavelength of 1 · 4 8 // m Icon. Figure 9 shows the situation when the relevant signal input is 1 0 d B m, while Figure 10 shows the situation when the relevant signal is input 4 0 d B m. In a smaller excitation input area than the data points shown in Figures 9 and 10, that is, a region with a larger concentration line product than these data points, the excitation wavelength is 1 · 5 X // m is greater than the excitation wavelength. · 4 8 // m can obtain greater gain, and have better characteristics of the area. This paper size applies the Chinese National Standard (CNS) A4 specification (210X297 mm) -13-^ 305 ^ 305 c L > (1/0 A7 B7 V. Description of the invention (11) Relevant excitation wavelength 1 · 5 X # m In each case, set the area with greater gain than when the excitation wavelength is 1 · 48 // Π1. According to the data shown in Figure 9, to obtain an approximate formula, if the concentration line length product is set to CL, the excitation input is set to For Pp, when the excitation wavelength is 1.535 // m, 1.54 βm, 1.55 4 5 // m, and 1 · 5 5 // m, the following formulas are used: CL > (1 / 0. 088) · 1η (PP / 〇 · 935), CL > (1/0 · 1 0 8) · 1 η (PP / 〇 · 447 2 2) · 1 η (ρ ρ / 〇. 2 CL > ( 1/0. 097) · 1η (Ρ Ρ / 〇 0.60 8 In addition, according to the data not shown in Fig. 10, the same formula was obtained, and the excitation wavelengths were 1.535 / m and 1.54 // m, 1 · 545 // m, and 1 · 5 5 // m, respectively, are as follows: Please read the precautions before filling in this page and then print it on the page printed by the employee's consumer cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs

> L C 〇 8 8 ο P P χί \ η 2 4 4 4

> L C

IX > L C

> LC ο ο 5 (Mm) -14 _ 493305 A7 B7 V. Description of the invention (12)) So, if the conditions of such areas' according to CL > (1 / α) · (Please read the precautions on the back before filling this page) When expressed by 1 η (ρ ρ / / 3), ^ and / 5 can be set to constants determined according to the wavelength of the excitation light and the size of the signal input ° α 値 is larger as the size of the signal input increases.与 'of α and yS is approximately 0 · 08 ~ 0 · 13 and 0 · 2 ~ 1 · 0 when the signal input is -10OdBm, and approximately 0 · 05 when the signal input is -4 0 dBm ~ 0.06 and 2.2 ~ 2.6 range. Figures 1 to 15 show the gain of the EDFA in the first figure of the signal wavelength when the input signal is 10 dBm and the excitation input is 8 5 · 5mW (Figure 11 is 9 OmW). Figures 1 1 to 1 5 show the excitation wavelengths 1 · 4 8 // m, 1 · 5 3 5 // m, 1 · 54 // m, 1 · 545 // m, and 1 · 55 / This figure shows the case of ζτη. From Figures 11 to 15, under the conditions of a signal input of 10 dBm and an excitation input of 85 · 5mW (90 mW at an excitation wavelength of 1.48 // m), the following can be obtained. In other words, when the signal wavelength is 1 5 7 8 nm to 1 6 1 5 nm, and the long-term product of 60 kppm · m ~ 9 0 k ρ pm · m is printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs, the excitation wavelength is 1 · 535 // m ~ 1 · 55 // m, a larger gain can be obtained when the excitation wavelength is 1 · 4 8 // m. When the signal wavelength is 1576nm ~ 1605nm and the concentration line length product is 70kppm • m ~ 90kppm · m, the excitation wavelength is 1 · 5 4 # m ~ l · 5 5 // m, which is 1 · 4 8em more than the excitation wavelength. This paper size can be obtained when the Chinese national standard (CNS) A4 specification (210X297 mm) -15-493305 A7 B7 is available. 5. Description of the invention (13) Larger gains and good gain flatness. That is, the signal wavelength dependence of the relative gain is small, and the gain variation is reduced. In the signal wavelength range of 1576nm ~ 1605nm, the gain fluctuation at the excitation wavelength of 1.54 // m ~ 1 · 5 5 # πί is about iciB. In order to have the same small gain fluctuation characteristics, when the excitation wavelength is 1 · 4 8 // m, the EDF of the concentration line length product must be more than 100kppm • m, which is described in the document Η · Sawada, et. al., "Broadband and gain-flattened erbium-soped fiber amplifier with + 20dBm output power for 15 8Onm band amplification, MProc. ECOC599, Nice, France, Sep. 1999, TuD3 · There are records in 16 ~ 20 The figure shows the gain of the EDFA in the first figure of the signal wavelength when the signal input is 40 d B m and the excitation input is 8 5 · 5mW (Figure 16 is 9 OmW). Figures 16 to 20 The figures shown are the diagrams when the excitation wavelengths are 1 · 48 // m, 1 · 535 // m, 1 · 54 // m, 1 · 545 // m, and 1 · 55 # m. In the graphs of 16 to 20, under the conditions of a signal input of 40 dBm and an excitation input of 85 · 5mW (90 mW at an excitation wavelength of 1 · 48 // m), the following can be obtained. That is, the signal In the case of a wavelength of 1570 nm to 1620nm and a concentration line length product of 7 Okppm · π ~ 90kppm · γπ, the excitation wavelength is 1 · 54 // m ~ 1 · 5 5 / im, which is higher than the excitation wavelength. 1 48 // m A larger gain can be obtained. In addition, the paper size of the signal applies to the Chinese National Standard (CNS) A4 specification (210X297 mm) -16-Please read 5 on the back first. I write the stamp of the employee ’s consumer cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs. System 493305 A7 _B7 V. Description of the invention (14) (Please read the precautions on the back ^ fill in this page first) 1 5 70nm ~ 1600nm, concentration line long product 70kppni • m ~ 9 0 kppm · m In the case, the excitation wavelength is 1 · 5 4 ym ~ 1 · 5 5 " m, which can obtain a larger gain than the excitation wavelength of 1 · 4 8 // m, and the gain flatness is also good. At the signal wavelength of 1 5 7 In the range of 〇nm ~ 1600nm, when the excitation wavelength is 1 · 54 / ^ ni ~ 1 · 5 5 // m, the gain change is about 2 d B especially when the concentration line length product is 80 kppm · m. If the gain If the flatness is better, the difference in level between the wavelengths of the signals output by the EDFA can be reduced, which can improve the effect of waveform distortion during propagation or the receiving characteristics of the receiver. In order to make the gain flatness superior, there is also a method using a gain equalizer, but since the gain equalizer generates a loss, the performance of the E D F A is deteriorated. Figures 2 to 2-5 show the gain of the EDFA in the first figure of the signal wavelength when the signal wavelength is 16 0 0 m and the excitation input is 85.5mW (Figure 21 is 90mW). Figures 16 to 20 show the excitation wavelengths of 1. 4 8 // m, 1.5 3 5 // m, printed by the 8th Industrial Cooperative Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs, 1 54 // m, 1 . 545 // m, and 1 · 55 # πί the case. From Figures 21 to 25, the following conditions can be obtained under the conditions of a signal wavelength of 1660 nm and an excitation input of 85 · 5mW (90mW at an excitation wavelength of 1.48 // m). Described. That is, if the input signal is between 40 dBm and 20 d Bm, when the concentration line length product is 7 Okppm · m ~ 9 Okp pm · m, the paper size applies the Chinese National Standard (CNS) A4 specification (210X297 mm) ) -17-493305 A7 B7 printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs V. Description of the invention (15), excitation wavelength 1 · 5 4 // m ~ 1 · 5 5 / im, compared with excitation wavelength 1 · 48 # m When gaining a larger gain. In addition, if the input signal is above 10 d B m, when the concentration line length product is 60 kppm · m ~ 90kppm.m, the excitation wavelength is 1 · 54 # m ~ 1 · 55, which is longer than the excitation wavelength of 1 · 48 vm. A large gain can be obtained. From the trends in the graphs 2 3 to 25, it can be predicted that even when the concentration line length product is greater than 90 kppm · !!!, the excitation wavelength is 1.54 // m to 1. 5 5 // m, which can be more exciting. A larger gain is obtained at a wavelength of 1 · 4 8 // m. In addition, from the trends shown in Figures 21 to 25, 'it can be predicted that at 30 kppm · !!! ~ 60kppm · !!!, when the excitation wavelength is 1 · 535 " m ~ 1 · 55 // m' The signal input is in the range of -40 dBm ~ -20 dBm, because it is learned that the gain decreases with the increase of the signal input ', so even if the signal input is above-10 d B m, it can be predicted that more exciting Large gain when the wavelength is 1 · 48 # πί. In addition to Figures 2 1 to 25, please also refer to Figures 3 and 4 for a signal wavelength of 1600 nm and an excitation input of 85.5 mW (90 m W at an excitation wavelength of 1 · 4 8 # m) Under the conditions' you can learn as follows. That is, when the signal input is 10 d B m and the product of the concentration line length is more than 5 5 k ρ pm · m, the excitation wavelength is 1 · 5 3 5 // m ~ 1. 55 // m, which can be compared with the excitation wavelength. 1 · 48 // m to obtain a larger, please read the back S items before filling in this page gain. When the signal input is a 40 d Bm concentration line length product at 65 kpp 2 0 dBm and above m, the excitation wavelength of this paper applies the Chinese National Standard (CNS) A4 specification (2 丨 〇x 297 mm) -18 -493305 A7 B7 V. Description of the invention (16) 1 · 535 / ini ~ 1 · It can obtain a larger gain than the excitation wavelength 1 · 48 " m. (Please read the precautions on the back and fill in this page first) [Effects of the invention] In summary, the words 'in the EDFA' according to the present invention, by using the excitation light with a wavelength of 1 5〇 # πί ~ 1 · 56 # πί 'It is possible to obtain a larger gain when the signal light of the L bandwidth is amplified' compared with when the excitation light with a wavelength of 1 · 4 8 A π is used. At the same time, it is possible to suppress the gain change relative to the fluctuation of the signal light wavelength. [Brief Description of the Drawings] Fig. 1 is a block diagram showing the structure of a light amplifier according to an embodiment of the present invention. Fig. 2 is a graph showing the gain of E D F A (bait addition fiber amplifier) shown in Fig. 1 with respect to the concentration line length product at a signal wavelength of 16 00 nm. Figure 3 is a plot of the EDFA increase with respect to the length of the concentration line at a signal wavelength of 16 0 nm and a signal input of 10 d B m. Show. Figure 4 is a graph of the gain of EDFA shown in Figure 1 with respect to the length of the concentration line at the signal input of 16 0 nm and a signal input of 40 dBm. Figure 5 is the EDFA work shown in Figure 1 relative to the signal input at 10 d B m and the concentration line length product at a signal wavelength of 16 0 nm. The paper dimensions are in accordance with the Chinese National Standard (CNS) A4 specifications. (210X297 ^^ 1: 19- 493305 A7 B7 V. Explanation of the invention (17) An example of the rate conversion efficiency. (Please read the precautions on the back first ^ fill out this page) Figure 6 shows the excitation wavelengths. Figure 1 shows the power conversion efficiency graph of EDFA relative to the excitation wavelength in the long product of concentration line that can obtain the highest power conversion efficiency. Figure 7 is the power conversion efficiency graph of Figure 1 EDFA relative to the excitation input. Figure 8 In the EDFA shown in Figure 1, when the excitation wavelength is 1 · 5 4 // m, the length of the concentration line product and the excitation input can be obtained with greater gain than the excitation wavelength of 1 · 4 8 // m. One of the combined legends: Figure 9 is a condition for obtaining a larger gain when the excitation wavelength is 1 · 5 X // m when the number is entered as a 10 d π π than when the excitation wavelength is 1 · 4 8 V m. Figure No. Figure 10 is when the signal input-40 d Bm, the excitation wavelength 1 · 5 X // m is more exciting Figure 1 shows the conditions for obtaining a larger gain when the length is 1 · 4 8 #. Figure 11 shows the relative signal input of 1 0 d B m and the excitation input to the Intellectual Property Bureau Staff Consumer Cooperative of the Ministry of Economic Affairs printed 90mW and the excitation wavelength 1 · Figure 1 at 48 // m £: 1:) ^^ Eight gain diagram. Fig. 12 is a graph of the gain of E D F A in Fig. 1 when the relative signal input is 1 0 d B m, the excitation input is 85 · 5mW, and the excitation wavelength is 1. · 535 Am. Figure 13 shows the relative signal input-1 0 d B m, excitation input 8 5 · 5 m W, and excitation wavelength 1 · 5 4 # m. Figure 1 This paper size applies Chinese National Standard (CNS) A4 specifications (210X297 mm) -2〇_ 493305 A7 B7 _____—— V. Description of the invention (18) Graphic of the gain of EDFA. Figure 14 is a graph of the gain of EDFA when the relative signal input is 1 0 d Bm, the excitation input is 85 · 5mW, and the excitation wavelength is 1.545Am. Figure 15 shows the gain of EDFA in Figure 1 when the relative signal input is 1 0 d B m, the excitation input is 85 · 5mW, and the excitation wavelength is 1 ·.

Figure 16 is a graph of the first EDFA gain at a signal input of 40 d B m, an excitation input of 90 mW, and an excitation wavelength of 1 · 48 # m. Figure 17 is a graph of the gain of EDFA when the relative signal input is 40 d B m, the excitation input is 85 · 5mW, and the excitation wavelength is 1 · 535 # m. Fig. 18 is a graph of the gain of EDFA in Fig. 1 when the relative signal input is -4 0 d B m, the excitation input is 85.5 mW, and the excitation wavelength is 1.54 // Π1. Printed by the Employees' Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs. Figure 19 is a graph showing the gain of EDFA when the relative signal input is 40 d Bm, the excitation input is 85 · 5mW, and the excitation wavelength is 1.545em. Figure 20 shows the gain of E D F A in Figure 1 when the relative signal input is 40 d B m, the excitation input is 85 · 5 mW, and the excitation wavelength is 1.

Figure 21 is the relative signal wavelength of 1 600 nm, excitation output Λ 9 0 mW, and excitation wavelength of 1. 48 // m. Figure 1 EDFA This paper size applies Chinese National Standard (CNS) A4 specification (210 parent 297) (Mm) -21-493305 A7 —-__— 5. Description of the invention (19) Graphic of gain. Figure 2 2 is the relative signal wavelength of 16 0 nm, excitation input (please read the notes on the back to fill in this page) 85 · 5mw, excitation wavelength 1 · 535 // m Figure 1

Graphic of EdFA's gain. Fig. 23 is a graph showing the gain of EDFA in Fig. 1 at a relative signal wavelength of 1600 nm, an excitation input of 85 · 5mW, and an excitation wavelength of 1.54 " m. Fig. 24 is the first picture when the relative signal wavelength is 16 0 0 π m, the excitation input is 85 · 5mW, and the excitation wavelength is 1 · 545 # m.

Graphic of EdFA's gain. Figure 25 is a graph showing the gain of EDFA when the relative signal wavelength is 16 00 nm, the excitation input is 85.5 mW, and the excitation wavelength is 1 · 5 5 // ηι. Component comparison table 12 Unidirectional device 1 3 Printed by the Consumer Property Cooperative of the Intellectual Property Bureau of the Ministry of Economics of the Optical Multiplexer 4 1 1 2 Source light excitation m FXD 5 El This paper size is applicable to China National Standard (CNS) A4 specification (210X297 mm) )

Claims (1)

493305 Α8 Β8 C8 D8 Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs 6. Application scope of patents 1. A 'first-amplification device' characterized by having: an excitation light source, optical multiplexer, and bait-added optical fiber; the excitation light source Is an excitation light source that outputs excitation light; the optical multiplexer is an input signal light and the excitation light and outputs it; the bait adds an optical fiber and takes the output of the optical multiplexer as an input, and The signal light is amplified and output; wherein the wavelength of the excitation light is in the range of 1 · 5 0 // m to 1 · 5 6 // m. 2. The optical amplifier according to item 1 of the scope of the patent application, wherein the wavelength of the signal light is from 1560 nm to 1610nm. 3. The optical amplifier according to item 2 of the scope of the patent application, wherein the relationship between the concentration line long product CL of the bait-added optical fiber and the excitation light intensity P p is: CL (1 / α) · In (P p / / 3) (where α and Θ refer to constants determined according to the wavelength of the excitation light and the intensity of the signal light, respectively). 4. An optical amplifying device, comprising: an excitation light source, an optical multiplexer, and a bait-added optical fiber; the excitation light source is an excitation light source for outputting excitation light; the optical multiplexer is an input signal light and the Those who excite the light and output it; those who add fiber to the bait take the output of the optical multiplexer as input and amplify and output the signal light; (Please read the precautions on the back first \ ^ write this page) ·, 1T line—This paper size is applicable to Chinese National Standard (CNS) A4 specification (210X297 mm) 493305 A8 B8 C8 D8 6. The scope of patent application, where the wavelength of the excitation light is 1 · 54 // m ~ 1 · 55em, The concentration product of the bait-added optical fiber is 60 k ρ pm · Hi ~ 90 k ρ pm · m. 5 · A kind of optical amplification device, characterized in that: it is provided with an excitation light source, an optical multiplexer and molybdenum " added optical fiber; the excitation light source is an excitation light source for outputting the excitation light; the optical multiplexer is an input signal The light and the excitation light are outputted; the bait added light _ 'is the one that takes the output of the optical multiplexer as an input and amplifies the signal light to output; wherein the intensity of the signal light is at 10 d B m or more, and the wavelength of the excitation light is 1.54 // m ~ 1. 55 // Π1, and the concentration line length product of the added fiber of the bait is 60 kppm · m ~ 9 〇kppm · m 〇 (please first Read the notes on the back \ ^ Write this page) t-, τ --- Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs This paper is printed in accordance with China National Standard (CNS) A4 (210X297 mm) _ 24-