Optical fiber, optical transceiver module, and optical fiber cable

Abstract

To provide an optical fiber, an optical transceiver module, and an optical fiber cable that can reduce noise caused by return light.SOLUTION: An optical fiber 1 comprises a core 2 comprising a core part 21 and a cladding 22. The core 2 has a bent part 20. The bent part 20 is bent at a radius of curvature smaller than the smallest bend radius of the core 2. This makes it possible to excite a mode other than a mode excited by incident of light from a light source on the optical fiber 1 and reduce noise caused by return light.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to an optical fiber, an optical transceiver module, and an optical fiber cable. [Background technology]

[0002] Conventionally, an optical transmission system including an optical transmitter, an optical receiver, and an optical fiber has been known. The optical transmitter includes an electrical-to-optical converter that converts an electrical signal into an optical signal. The optical receiver includes an optical-to-electrical converter that converts the optical signal into an electrical signal (see, for example, Patent Document 1 below). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2000-151516 Summary of the Invention [Problem to be solved by the invention]

[0004] In an optical transmission system such as that described in Patent Document 1, a portion of the optical signal output from the optical transmitter may be reflected by the end face of an optical fiber, resulting in return light. If the return light enters the optical transmitter, the optical signal output from the optical transmitter will interfere with the return light, generating noise.

[0005] Such noise caused by the returned light can potentially cause an increase in the bit error rate.

[0006] The present invention provides an optical fiber, an optical transceiver module, and an optical fiber cable that are capable of reducing noise caused by returned light. [Means for solving the problem]

[0007] The present invention [1] includes an optical fiber having a core composed of a core and a clad, the core having a bent portion bent with a radius of curvature smaller than the minimum bending radius of the core.

[0008] With this configuration, modes other than the mode excited by the incidence of light from the light source on the optical fiber are excited.

[0009] Therefore, it is possible to reduce noise caused by the returning light.

[0010] The present invention [2] includes the optical fiber according to the above [1], wherein the core has a scrambled region including a plurality of the bent portions.

[0011] With this configuration, modes other than the mode excited by the incidence of light from the light source onto the optical fiber are excited in the scrambled region.

[0012] Therefore, it is possible to further reduce noise caused by the returning light.

[0013] The present invention [3] includes the optical fiber according to the above [2], wherein the scrambled region has a plurality of the bent portions each having a continuous wave shape.

[0014] The present invention [4] includes the optical fiber according to the above [3], wherein the wavelength of the corrugated fiber is 5 mm or less.

[0015] The present invention [5] includes the optical fiber according to the above [3], wherein the amplitude of the waveform is 100 μm or more.

[0016] The present invention [6] includes the optical fiber according to the above [3], wherein the wavelength of the waveform is 5 mm or less and the amplitude of the waveform is 100 μm or more.

[0017] The present invention [7] includes any one of the optical fibers [1] to [6] above, in which, when light having a wavelength of 850 nm is input from one end of the optical fiber and the light output from the other end of the optical fiber is received, the attenuation rate of the optical power of the received light relative to the optical power of the input light is 3% or more and 50% or less.

[0018] According to this configuration, it is possible to reduce noise caused by returned light while suppressing an excessive increase in transmission loss.

[0019] The present invention [8] includes an optical transceiver module comprising a transmitting circuit capable of converting an electrical signal into an optical signal and transmitting the optical signal, and a transmitting optical fiber that is any one of the optical fibers [1] to [7] above and is connected to the transmitting circuit.

[0020] According to this configuration, since the optical fiber is provided, it is possible to reduce noise caused by returning light.

[0021] The present invention [9] includes the optical transceiver module of the above [8], further comprising a receiving circuit capable of converting a received optical signal into an electrical signal.

[0022] The present invention

[10] includes the optical transceiver module according to the above [9], further comprising a receiving-side optical fiber connected to the receiving circuit, the optical fiber being any one of the above [1] to [7].

[0023] The present invention

[11] includes an optical transceiver module comprising a receiving circuit capable of converting a received optical signal into an electrical signal, and a receiving-side optical fiber that is any one of the optical fibers [1] to [7] above and is connected to the receiving circuit.

[0024] According to this configuration, since the optical fiber is provided, it is possible to reduce noise caused by returning light.

[0025] The present invention

[12] includes an optical fiber cable comprising an optical transceiver module and an optical fiber cord connected to the optical transceiver module, wherein the optical transceiver module comprises a transmitting circuit capable of converting an electrical signal into an optical signal and transmitting the optical signal, and a transmitting optical fiber which is any one of the optical fibers [1] to [7] above and is connected to the transmitting circuit.

[0026] According to this configuration, since the optical fiber is provided, it is possible to reduce noise caused by returning light.

[0027] The present invention

[13] includes the optical fiber cable according to the above

[12] , wherein the optical transceiver module further comprises a receiving circuit capable of converting a received optical signal into an electrical signal.

[0028] The present invention

[14] includes the optical fiber cable according to the above

[13] , which is the optical fiber of any one of the above [1] to [7], and further includes a receiving-side optical fiber connected to the receiving circuit.

[0029] The present invention

[15] includes an optical fiber cable comprising an optical transceiver module and an optical fiber cord connected to the optical transceiver module, the optical transceiver module comprising a receiving circuit capable of converting a received optical signal into an electrical signal, and a receiving-side optical fiber which is any one of the optical fibers [1] to [7] above and is connected to the receiving circuit.

[0030] According to this configuration, since the optical fiber is provided, it is possible to reduce noise caused by returning light.

[0031] The present invention

[16] includes an optical fiber cable comprising an optical transceiver module and an optical fiber cord connected to the optical transceiver module, the optical fiber cord having any one of the optical fibers [1] to [7] above.

[0032] According to this configuration, since the optical fiber is provided, it is possible to reduce noise caused by returning light. [Effects of the Invention]

[0033] The optical fiber, optical transceiver module, and optical fiber cable of the present invention can reduce noise caused by returned light. [Brief explanation of the drawings]

[0034] [Figure 1] FIG. 1 is a cross-sectional view showing an embodiment of the optical fiber of the present invention. [Figure 2] FIG. 2 is a cross-sectional view of the optical fiber shown in FIG. 1 taken along the line AA. [Figure 3] FIG. 3 shows an embodiment of the optical transceiver module of the present invention. [Figure 4] FIG. 4 is a block diagram showing a circuit configuration of the circuit board shown in FIG. [Figure 5] FIG. 5 shows an embodiment of the optical fiber cable of the present invention. [Figure 6] FIG. 6 shows a modified example of the optical fiber cable of the present invention. [Figure 7] Figures 7A and 7B are process diagrams illustrating a method for forming a scrambled area in an optical fiber, where Figure 7A shows the process of clamping the optical fiber with a jig, and Figure 7B shows the process of forming a scrambled area in the optical fiber. [Figure 8] 8A and 8B show correlation diagrams between the amplitude of the scrambled region and the optical power, and between the amplitude of the scrambled region and the bit error rate, respectively. DETAILED DESCRIPTION OF THE INVENTION

[0035] In this specification, the term "minimum bending radius" refers to the minimum bending radius at which the increase in transmission loss in a bent state is 0.1 dB or more.

[0036] In this specification, "optical power attenuation rate" refers to the attenuation rate of the optical power of the output light relative to the optical power of the input light, when light with a wavelength of 850 nm is input to one end of the optical fiber and the light output from the other end is received. The optical power is measured using a bit error rate tester (hereinafter sometimes abbreviated as BERT).

[0037] In this specification, "amplitude" refers to the distance that the optical fiber is pressed in the radial direction by a plurality of protrusions provided on the jig (for details, see amplitude A in FIG. 7B, which will be described later).

[0038] 1. Optical Fiber 1 and 2, the optical fiber 1 includes a core 2. The core 2 is made up of a core 21 and a clad 22. The refractive index of the core 21 is higher than the refractive index of the clad 22.

[0039] The structure and material of the optical fiber 1 are not limited. The optical fiber 1 may be, for example, a bare optical fiber consisting of only a core 21 and a clad 22 (i.e., core 2). The optical fiber 1 may be an optical fiber wire in which a primary coating is applied to the surface of a bare optical fiber. The optical fiber 1 may be an optical fiber core in which a secondary coating is applied to an optical fiber wire. The optical fiber 1 may also be a multimode optical fiber or a single-mode optical fiber. The core 21 and the clad 22 may be made of silica glass or a resin. Examples of resins include fluorine-containing resins, acrylic resins (e.g., polymethyl methacrylate), styrene resins, and carbonate resins. The core 2 may have multiple cores 21. The optical fiber 1 may be a multi-core fiber. The core 2 may have multiple clads 22. The optical fiber 1 may be a double-clad fiber.

[0040] The core 2 has a scrambled area 2 A and a non-scrambled area 2 B. The core 2 does not have to have a non-scrambled area 2 B.

[0041] (1) Scrambled area The scrambled region 2A includes a plurality of bent portions 20. In other words, the core 2 has bent portions 20. The bent portions 20 are bent with a radius of curvature smaller than the minimum bend radius of the core 2.

[0042] The term "multiple bends 20" means that the number of bends 20 is two or more. A relatively large number of bends 20 may lead to a decrease in the strength of the optical fiber 1, so the upper limit of the number of bends 20 is, for example, 20 or less, preferably 15 or less, and more preferably 10 or less. Specifically, the number of bends 20 is 5, as shown in FIG. 1 . Since the bends 20 are bent at a curvature radius smaller than the minimum bending radius of the core 2, modes other than the mode excited by the incidence of light from the light source on the optical fiber 1 are excited. As a result, noise caused by returned light can be reduced.

[0043] When the core 21 and the clad 22 are both made of silica glass, the minimum bending radius of the core 2 is, for example, 15 mm to 60 mm.

[0044] When the core 21 is made of a resin containing polymethyl methacrylate (ie, an acrylic resin) and the clad 22 is made of a resin containing tetrafluoroethylene units (ie, a fluorine-containing resin), the minimum bending radius of the core 2 is, for example, 5 mm to 60 mm.

[0045] When light with a wavelength of 850 nm is input from one end of the optical fiber 1 and the light output from the other end of the optical fiber 1 is received, the attenuation rate of the optical power of the received light relative to the optical power of the input light is, for example, 3% or more, preferably 5% or more. When the attenuation rate is equal to or greater than the above lower limit, noise caused by returning light can be reduced.

[0046] The attenuation rate is, for example, 50% or less, or preferably 30% or less. When the attenuation rate is equal to or less than the upper limit, an excessive increase in transmission loss can be suppressed.

[0047] The scrambled region 2A has a wave shape with a plurality of bent portions 20 continuing one after the other.

[0048] The wavelength L of the waveform of the scrambled region 2A is, for example, 5 mm or less, preferably 2.5 mm or less. When the wavelength L is equal to or less than the upper limit, modes other than the mode excited by the light incident on the optical fiber 1 from the light source can be excited, and noise caused by the returned light can be reduced.

[0049] The wavelength L is, for example, 0.5 mm or more, preferably 1 mm or more. When the wavelength L is equal to or greater than the lower limit, an excessive increase in transmission loss can be suppressed.

[0050] The ratio of the wavelength L of the waveform of the scrambled region 2A to the length of the optical fiber 1 is, for example, 0.001% or more and 0.1% or less. When the ratio of the wavelength L is within the above-mentioned predetermined range, it is possible to achieve both the strength of the optical fiber 1 and the suppression of transmission loss.

[0051] The amplitude A of the waveform of the scrambled region 2A is, for example, 100 μm or more, preferably 150 μm or more. When the amplitude A is equal to or greater than the above-mentioned lower limit, modes other than the mode excited by the light incident on the optical fiber 1 from the light source can be excited, and noise caused by the returned light can be reduced.

[0052] The amplitude A is, for example, 500 μm or less, preferably 300 μm or less, and more preferably 250 μm or less. When the amplitude A is equal to or less than the above upper limit, an excessive increase in transmission loss can be suppressed.

[0053] (2) Non-scrambled area The non-scrambled region 2B does not have a bent portion 20. The non-scrambled region 2B preferably has a linear shape. The non-scrambled region 2B may be bent with a radius of curvature larger than the minimum bending radius of the core 2.

[0054] 2. Optical transceiver module As shown in FIG. 3, the optical transceiver module 10 includes a casing 11, a circuit board 12, a transmitting optical fiber 13, a receiving optical fiber 14, and an optical connector 15.

[0055] The casing 11 has a cylindrical shape that extends in a predetermined direction and accommodates a circuit board 12, a transmitting optical fiber 13, a receiving optical fiber 14, and an optical connector 15. The casing 11 is made of metal or resin.

[0056] The circuit board 12 is disposed within the casing 11. As shown in Figure 4, the circuit board 12 has a transmitting circuit 121 and a receiving circuit 122. In other words, the optical transceiver module 10 includes the transmitting circuit 121 and the receiving circuit 122.

[0057] The transmission circuit 121 can convert an electrical signal into an optical signal and transmit the optical signal. The transmission circuit 121 includes, for example, a VCSEL (vertical-cavity surface-emitting laser) 1211 and a driver 1212. The VCSEL 1211 oscillates an optical signal (laser light) in response to an input electrical signal. In this way, the transmission circuit 121 converts the electrical signal into an optical signal. The driver 1212 drives the VCSEL 1211. The optical signal oscillated by the VCSEL 1211 is incident on one end of the transmission-side optical fiber 13 via a lens. In this way, the transmission circuit 121 can transmit the optical signal oscillated by the VCSEL 1211.

[0058] The receiving circuit 122 can convert the received optical signal into an electrical signal. If the receiving circuit 122 does not perform correction processing, the receiving circuit 122 does not include a DSP (digital signal processor). The receiving circuit 122 includes, for example, a photodiode 1221 and a transimpedance amplifier 1222. The optical signal transmitted by the receiving-side optical fiber 14 is input to the photodiode 1221. The photodiode 1221 outputs an electrical signal in accordance with the input optical signal. In this way, the receiving circuit 122 converts the optical signal into an electrical signal. The transimpedance amplifier 1222 amplifies the electrical signal output by the photodiode 1221.

[0059] One end of the transmitting optical fiber 13 is connected to the transmitting circuit 121. More specifically, one end of the transmitting optical fiber 13 is connected to the VCSEL 1211 of the transmitting circuit 121 via a lens.

[0060] One end of the receiving optical fiber 14 is connected to the receiving circuit 122. More specifically, one end of the receiving optical fiber 14 is connected to the photodiode 1221 of the receiving circuit 122.

[0061] Here, at least one of the sending-side optical fiber 13 and the receiving-side optical fiber 14 is the above-described optical fiber 1. Preferably, the sending-side optical fiber 13 is the above-described optical fiber 1. The receiving-side optical fiber 14 may be an optical fiber that does not have a scramble region 2A. Both the sending-side optical fiber 13 and the receiving-side optical fiber 14 may be the above-described optical fiber 1.

[0062] If the transmitting optical fiber 13 is the optical fiber 1 described above, modes other than those excited by the incidence of light from the light source onto the optical fiber 1 can be excited in the transmitting optical fiber 13, thereby reducing noise caused by returned light.

[0063] 3, the optical connector 15 supports the other end of the transmitting optical fiber 13 and the other end of the receiving optical fiber 14. Examples of the optical connector 15 include an MT connector and an MPO connector.

[0064] 3. Fiber optic cable 5, an optical fiber cable 100 includes, for example, the above-described optical transceiver module 10 and an optical fiber cord 101. Note that the term "optical fiber cord" refers to an optical fiber having a tensile strength member in the form of an optical fiber core or an optical fiber bare wire covered with a plastic sheath.

[0065] The optical fiber cord 101 is connected to the optical transceiver module 10. In this embodiment, the optical fiber cord 101 is detachably connected to the optical transceiver module 10. More specifically, an optical connector 102A is provided at one end of the optical fiber cord 101, and an optical connector 102B is provided at the other end of the optical fiber cord 101. The optical connector 102A is connected to the optical connector 15 (see FIG. 3) of one optical transceiver module 10A. The optical connector 102A is detachably attached to the optical connector 15 of the one optical transceiver module 10A. The optical connector 102B is connected to the optical connector 15 of the other optical transceiver module 10B. The optical connector 102B is detachably attached to the optical connector 15 of the other optical transceiver module 10B. When the optical connectors 15 of the optical transceiver modules 10A and 10B are MPO connectors, the optical connectors 102A and 102B are also MPO connectors.

[0066] The optical fiber cord 101 includes at least a first optical fiber strand and a second optical fiber strand. The first optical fiber strand connects the transmitting optical fiber 13 of one optical transceiver module 10A to the receiving optical fiber 14 of the other optical transceiver module 10B. The second optical fiber strand connects the transmitting optical fiber 13 of the other optical transceiver module 10B to the receiving optical fiber 14 of the one optical transceiver module 10A.

[0067] The optical fiber cord 101 may include the optical fiber 1 (see FIG. 1 ). Specifically, the first and second optical fibers may be the optical fiber 1. In this case, the optical transceiver module 10 does not need to include the transmitting optical fiber 13 and the receiving optical fiber 14. The first and second optical fibers each have a first end connected to the transmitting optical fiber 13 and a second end connected to the receiving optical fiber 14. The first end of the first optical fiber is connected to the transmitting circuit 121 of one optical transceiver module 10A, and the second end of the first optical fiber is connected to the receiving circuit 122 of the other optical transceiver module 10B. Similarly, the first end of the second optical fiber is connected to the transmitting circuit 121 of the other optical transceiver module 10B, and the second end of the second optical fiber is connected to the receiving circuit 122 of the one optical transceiver module 10A. In this case, the scramble area 2A is preferably provided at the first end of each of the first and second optical fiber strands.

[0068] That is, in the optical fiber cable 100, the optical fiber 1 connected to the transmitting circuit 121 of the optical transceiver module 10 is preferably the optical fiber 1 (see FIG. 1) described above. In other words, in the optical fiber cable 100, the scrambled area 2A (see FIG. 1) is formed in the core of the optical fiber 1 connected to the transmitting circuit 121 of the optical transceiver module 10.

[0069] This allows exciting a mode other than the mode excited by the incidence of light from the light source on the optical fiber 1 (ie, a mode included in the returned light) immediately before the returned light enters the transmission circuit 121.

[0070] 4. Effects (1) As shown in Fig. 1, an optical fiber 1 includes a core 2 made up of a core 21 and a cladding 22. The core 2 has a bent portion 20. The bent portion 20 is bent with a curvature radius smaller than the minimum bending radius.

[0071] Therefore, modes other than the mode excited by the incidence of light from the light source on the optical fiber 1 can be excited.

[0072] As a result, noise caused by the returning light can be reduced.

[0073] (2) According to the optical fiber 1, as shown in FIG. 1, the core 2 has a scrambled region 2A including a plurality of bent portions 20.

[0074] Specifically, the scrambled region 2A has a wave shape in which a plurality of bent portions 20 are continuous, the wave shape has a wavelength L of 5 mm or less, and an amplitude A of 100 μm or more.

[0075] Therefore, in the scrambled region 2A, modes other than the mode excited by the incidence of light from the light source onto the optical fiber 1 can be excited.

[0076] As a result, noise caused by the returning light can be further reduced.

[0077] (3) According to the optical fiber 1, when light having a wavelength of 850 nm is input to one end of the optical fiber 1 and the light output from the other end of the optical fiber 1 is received, the attenuation rate of the optical power of the received light relative to the optical power of the input light is 3% or more and 50% or less.

[0078] Therefore, it is possible to reduce noise caused by the returning light while suppressing an excessive increase in transmission loss.

[0079] (4) As shown in FIG. 4, the optical transceiver module 10 includes a transmitting optical fiber 13 connected to the transmitting circuit 121 and a receiving optical fiber 14 connected to the receiving circuit 122.

[0080] At least one of the transmitting optical fiber 13 and the receiving optical fiber 14 is the optical fiber 1 described above.

[0081] Therefore, it is possible to reduce noise caused by the returning light.

[0082] (5) As shown in FIG. 5, the optical fiber cable 100 includes the optical transceiver module 10 described above, or has the optical fiber 1 described above in the optical fiber cord 101.

[0083] Therefore, it is possible to reduce noise caused by the returning light.

[0084] 5. Variations In the modified example, the same components as those in the above-described embodiment are denoted by the same reference numerals, and the description thereof will be omitted.

[0085] 6, the optical fiber cable 100 may be an AOC cable. In other words, the optical fiber cord 101 may be non-detachable from the optical transceiver module 10.

[0086] (2) A plurality of optical fiber cords 101 may be connected between one optical transceiver module 10A and the other optical transceiver module 10B.

[0087] (3) In these modified examples, the same effects as those of the above-described embodiment can be obtained. [Example]

[0088] The present invention will be described in more detail below with reference to examples, but the present invention is not limited to these examples.

[0089] 1. Forming the bent part 7A and 7B, a part of the optical fiber 1 was sandwiched between jigs Z1 and Z2 and bent into a wave shape to form a scrambled region (see FIG. 1). Each of the jigs Z1 and Z2 has a plurality of protrusions P and is movable in a movement direction, which is the radial direction of the optical fiber 1.

[0090] A mode scrambler (product name: FM-1, manufactured by Newport, spacing between protrusions P: 1.1 mm) was used as the jigs Z1 and Z2 having multiple protrusions P. Furthermore, an optical fiber wire with an outer diameter of 0.25 mm (core material: quartz glass, core diameter: 50 μm, cladding material: quartz glass, cladding outer diameter: 125 μm, resin coating: ultraviolet curing resin) was used as the optical fiber 1.

[0091] 2. Optical power and bit error rate measurements With a portion of the optical fiber 1 bent in a wave-like shape as shown in Figure 7B, a BERT tester (manufactured by VeEX) was used to input light with a wavelength of 850 nm into one end of the optical fiber 1 (length: 3 m), and receive the light output from the other end of the optical fiber 1 to measure the attenuation rate of the optical power of the output light relative to the optical power of the input light and the bit error rate.

[0092] Fig. 8A shows a correlation diagram between the amplitude A of the scrambled region and the optical power, and Fig. 8B shows a correlation diagram between the amplitude A of the scrambled region and the bit error rate.

[0093] 8A and 8B show that when the amplitude A exceeds 175 μm, the optical power attenuates and the bit error rate tends to decrease significantly.

[0094] Since the optical power is attenuated, it is believed that the core and cladding of optical fiber 1 are bent at a curvature radius smaller than the minimum bending radius when amplitude A exceeds 175 μm. Also, since the bit error rate is reduced, it is believed that noise has been reduced. [Explanation of symbols]

[0095] 1. Optical fiber 2-core 2A Scramble Area 10 Optical Transceiver Module 13 Transmitting optical fiber 14 Receiving optical fiber 21 cores 22 Clad 100 Fiber Optic Cable 101 Optical fiber cord 121 Transmitting circuit 122 receiving circuit A amplitude L wavelength

Claims

1. A core is provided, the core being made up of a core and a clad. The optical fiber, wherein the core has a bent portion bent at a radius of curvature smaller than the minimum bend radius of the core.

2. The optical fiber of claim 1 , wherein the core has a scrambled region that includes a plurality of the bends.

3. The optical fiber according to claim 2 , wherein the scramble region has a wave shape in which a plurality of the bent portions are continuous.

4. 4. The optical fiber according to claim 3, wherein the wavelength of the corrugated shape is 5 mm or less.

5. 4. The optical fiber according to claim 3, wherein the amplitude of the waveform is 100 μm or more.

6. 4. The optical fiber according to claim 3, wherein the wavelength of the waveform is 5 mm or less, and the amplitude of the waveform is 100 μm or more.

7. 2. The optical fiber according to claim 1, wherein when light having a wavelength of 850 nm is incident on one end of the optical fiber and the light output from the other end of the optical fiber is received, the attenuation rate of the optical power of the received light relative to the optical power of the incident light is 3% or more and 50% or less.

8. a transmitting circuit capable of converting an electrical signal into an optical signal and transmitting the optical signal; The optical fiber according to any one of claims 1 to 7, further comprising a transmitting optical fiber connected to the transmitting circuit. An optical transceiver module comprising:

9. 9. The optical transceiver module of claim 8, further comprising a receiving circuit capable of converting a received optical signal into an electrical signal.

10. 10. The optical transceiver module according to claim 9, further comprising a receiving-side optical fiber connected to the receiving circuit, the optical fiber being the optical fiber according to any one of claims 1 to 7.

11. a receiving circuit capable of converting a received optical signal into an electrical signal; The optical fiber according to any one of claims 1 to 7, further comprising a receiving-side optical fiber connected to the receiving circuit. An optical transceiver module comprising:

12. an optical transceiver module; an optical fiber cord connected to the optical transceiver module; Equipped with The optical transceiver module includes: a transmitting circuit capable of converting an electrical signal into an optical signal and transmitting the optical signal; The optical fiber according to any one of claims 1 to 7, further comprising a transmitting optical fiber connected to the transmitting circuit. An optical fiber cable comprising:

13. The optical transceiver module includes: The fiber optic cable of claim 12, further comprising a receiver circuit capable of converting a received optical signal into an electrical signal.

14. The optical fiber cable according to claim 13, further comprising a receiving-side optical fiber that is the optical fiber according to any one of claims 1 to 7 and is connected to the receiving circuit.

15. an optical transceiver module; an optical fiber cord connected to the optical transceiver module; Equipped with The optical transceiver module includes: a receiving circuit capable of converting a received optical signal into an electrical signal; The optical fiber according to any one of claims 1 to 7, further comprising a receiving-side optical fiber connected to the receiving circuit. An optical fiber cable comprising:

16. an optical transceiver module; an optical fiber cord connected to the optical transceiver module; Equipped with The optical fiber cord is An optical fiber cable comprising the optical fiber according to any one of claims 1 to 7.

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