Single-fiber bidirectional wavelength tunable optical device

Abstract

The invention provides a single-fiber bidirectional wavelength tunable optical device, which comprises an emission tunable laser, a round square tube body, a single-fiber bidirectional optical interface, an input optical wavelength tunable device and a detection receiver, and is characterized in that the emission tunable laser and the single-fiber bidirectional optical interface are fixed at two ends of the round square tube body; the input light wavelength tunable device is fixed on one side of the round square tube body, the detection receiver is fixedly connected with the input light wavelength tunable device, the input light wavelength tunable device comprises a cold and hot driver, an FP etalon and a thermistor, the FP etalon is arranged in the middle of the cold and hot driver, and the thermistor is arranged in the middle of the FP etalon. And the thermistor is arranged on the FP etalon. By adopting the technical scheme of the invention, the input and receiving of light with various wavelengths can be realized.

Description

Technical Field

[0001] The invention relates to the field of optical devices, in particular to a single-fiber bidirectional wavelength tunable optical device. Background Art

[0002] NG-GPON2 is regarded as the next generation PON technology, with the characteristics of large bandwidth, large splitting, long distance, etc. With the research and definition of NG-PON2 series standards, single-channel OLT commercial applications have been realized in Europe and the United States. Among them, single-fiber bidirectional optical devices are an important component in NG-GPON2 technology.

[0003] Traditional single-fiber bidirectional optical devices consist of a transmitting laser and a receiving detector, and the laser and the detector have a single working wavelength and cannot receive and transmit light of different wavelengths. Summary of the invention

[0004] The object of the present invention is to provide a single-fiber bidirectional wavelength tunable optical device, thereby realizing the input and reception of multiple wavelengths of light.

[0005] In an embodiment of the present invention, a single-fiber bidirectional wavelength tunable optical device is provided, which includes: an emitting tunable laser, a round square tube body, a single-fiber bidirectional optical interface, an input light wavelength tunable device and a detection receiver, the emitting tunable laser and the single-fiber bidirectional optical interface are fixed at both ends of the round square tube body, the input light wavelength tunable device is fixed on one side of the round square tube body, the detection receiver is fixedly connected to the input light wavelength tunable device, and the input light wavelength tunable device includes a hot and cold driver, an FP standard tool and a thermistor, the FP standard tool is arranged in the middle of the hot and cold driver, and the thermistor is arranged on the FP standard tool.

[0006] In the embodiment of the present invention, a central light transmission window is provided in the middle of the hot and cold actuator, and the FP etalon is provided on the central light transmission window.

[0007] In the embodiment of the present invention, the FP etalon adopts a double-cavity design.

[0008] In an embodiment of the present invention, the input light wavelength tunable device further includes a heat conduction base and a hemispherical glass lens, a light detector, and a beam splitter prism arranged on the heat conduction base. The beam splitter prism is used to divide a certain proportion of the input light to the light detector. The light detector is used to detect the size of the light separated by the beam splitter prism and generate a detection current to adjust the surface temperature of the FP etalon. The hemispherical glass lens is used to receive the input light passing through the FP etalon, converge it, and transmit it to the detection receiver.

[0009] In the embodiment of the present invention, the input light wavelength tunable device further includes a positioning carrier engaged with the heat transfer base.

[0010] In an embodiment of the present invention, the tunable laser emitter includes a multilayer ceramic circuit and a tunable laser chip, a silicon substrate and a collimating lens arranged in the multilayer ceramic circuit.

[0011] The tunable laser chip is used to output a light beam of a set wavelength;

[0012] The silicon substrate is used to introduce the signals of the tunable laser chip, the thermistor and the backlight detector into the multilayer ceramic circuit;

[0013] The collimating lens is used to convert the light output by the tunable laser chip from a convergent light beam into a parallel light beam.

[0014] In an embodiment of the present invention, the emitting tunable laser further includes a backlight detector and a beam splitter prism structure. The beam splitter prism structure is arranged in the output light path of the tunable laser chip, and is used to transmit light and reflect light according to a set ratio, and input the reflected light into the backlight detector.

[0015] In the embodiment of the present invention, the single-fiber bidirectional wavelength tunable optical device further includes an optical isolator arranged between the emission light tunable device and the round square tube body.

[0016] In the embodiment of the present invention, a transflective filter perpendicular to the radial direction of the round square tube is also provided in the round square tube, and the transflective filter is used to transmit the output light of the tunable laser and reflect the light input from the single-fiber bidirectional optical interface.

[0017] In the embodiment of the present invention, a transflective filter is also provided in the square tube body, which is arranged at 45 degrees to the radial direction of the square tube body. The reflective filter is used to reflect the light input from the single-fiber bidirectional optical interface to the input light wavelength tunable device for secondary reflection.

[0018] Compared with the prior art, the single-fiber bidirectional wavelength tunable optical device of the present invention includes a transmitting tunable laser and an input light wavelength tunable device, which can realize the input and reception of multiple wavelengths of light. The input light wavelength tunable device includes a hot and cold driver, an FP standard and a thermistor. The FP standard is arranged in the middle of the hot and cold driver, and the thermistor is arranged on the FP standard, which can reduce the tuning time of the input light; the transmitting tunable laser also includes a backlight detector and a beam splitter prism structure. The beam splitter prism structure is arranged in the output light path of the tunable laser chip, which is used to transmit light and reflect light according to a set ratio, and input the reflected light to the backlight detector, so that the energy of the output light wavelength can be accurately monitored. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of a single-fiber bidirectional wavelength tunable optical device according to an embodiment of the present invention.

[0020] Figure 2 1 is an exploded diagram of the input light wavelength tunable device according to an embodiment of the present invention.

[0021] Figure 3 It is a schematic diagram of the structure of the emission tunable laser according to an embodiment of the present invention. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0023] The implementation of the present invention is described in detail below in conjunction with specific embodiments.

[0024] like Figure 1 As shown, in an embodiment of the present invention, a single-fiber bidirectional wavelength tunable optical device is provided, which includes a transmitting tunable laser 1, a round square tube body 2, a single-fiber bidirectional optical interface 3, an input light wavelength tunable device 4, a detection receiver 5 and an optical isolator 6. The transmitting tunable laser 1 and the single-fiber bidirectional optical interface 3 are fixed at both ends of the round square tube body 2. The optical isolator 6 is arranged between the transmitting tunable laser 1 and the round square tube body 2. The input light wavelength tunable device 4 is fixed to one side of the round square tube body 2. The detection receiver 5 is fixedly connected to the input light wavelength tunable device 4.

[0025] The single-fiber bidirectional optical interface 3 is connected to an external optical fiber, and is used to receive light from the external optical fiber to the input optical wavelength tunable device 4 and to send light generated by the emission tunable laser 1 to the external optical fiber.

[0026] The input light wavelength tunable device 4 is used to receive the input light introduced from the single-fiber bidirectional optical interface 3. Figure 2 As shown, the input light wavelength tunable device 4 includes a heat transfer base 41 and a hemispherical glass lens 42 disposed on the heat transfer base 41, a light detector 43, a beam splitter prism 44, a hot and cold driver 45, an FP etalon 46, a thermistor 47, and a positioning carrier 48 engaged with the heat transfer base 41. The beam splitter prism 44 is used to split a certain proportion of the input light to the light detector 43. The light detector 43 is used to detect the size of the light split by the beam splitter prism 44 and generate a detection current to adjust the surface temperature of the FP etalon 46. The hemispherical glass lens 42 is used to converge the input light passing through the FP etalon 46 and transmit it to the detection receiver 5. The positioning carrier 48 is used to position the connection between the input light wavelength tunable device 4 and the round square tube body 2.

[0027] The FP etalon 46 is arranged in the middle of the hot and cold driver 45, and the thermistor 47 is arranged on the FP etalon 46. A center light transmission window is arranged in the middle of the hot and cold driver 45, and the FP etalon 46 is arranged on the center light transmission window. The hot and cold driver 45 can quickly realize heating and cooling functions according to the forward and reverse directions of the circuit, and is used to control the temperature of the FP etalon 46, so as to achieve wavelength tuning. The thermistor 47 is used to realize temperature adjustment according to the temperature of the hot and cold driver 45.

[0028] It should be noted that the FP etalon 46 is a silicon standard function, and its tuning wavelength periodically changes with temperature. By adjusting the temperature of the FP etalon 46, the adjustment of the receiving wavelength period is achieved. It should be noted that the traditional FP standard usually adopts a single-cavity design, and its typical wavelength has a positive and negative offset of 0.1nm and an insertion loss of 4dB. The FP etalon 46 of the present invention adopts a dual-cavity design, and its typical wavelength has a positive and negative offset of 0.1nm and an insertion loss of less than 0.5dB. In this way, the flat area of ​​the peak can be overlapped, solving the problem of optical index attenuation caused by excessive insertion loss of the traditional single-cavity etalon, thereby achieving wavelength adjustment and meeting the transmission index required by the product protocol.

[0029] like Figure 3 As shown, the emitting tunable laser 1 includes a multilayer ceramic circuit 11 and a tunable laser chip 12 , a silicon substrate 13 , a thermistor 14 , a collimating lens 15 , a backlight detector 16 and a beam splitter prism structure 17 arranged in the multilayer ceramic circuit 11 .

[0030] The tunable laser chip 12 is used to output a light beam of a set wavelength. The silicon substrate 13 is used to introduce the signals of the tunable laser chip 12, the thermistor 14 and the backlight detector 16 into the multilayer ceramic circuit 11. The collimating lens 15 is used to convert the light output by the tunable laser chip 12, converting it from a convergent light beam to a parallel light beam. The beam splitter prism structure 17 is arranged in the output light path of the tunable laser chip 12, and is used to transmit light and reflect light according to a set ratio, and input the reflected light into the backlight detector 16.

[0031] It should be noted that the conventional backlight detector is usually arranged at the rear end of the laser chip. Due to the grating structure of the tunable laser, there is a difference between the wavelength of the backward light and the wavelength of the forward light, resulting in a difference in the energy of the monitored light waves. In this embodiment, the backlight detector 16 is arranged in the output direction of the tunable laser chip 12, which can effectively monitor the energy of the output light wavelength.

[0032] Furthermore, in the embodiment of the present invention, the square tube body 2 is a tubular cavity structure, and a transflective filter 21 perpendicular to the radial direction of the square tube body 2 is also provided therein, and the transflective filter 21 is used to transmit the output light of the emission tunable laser 1 and reflect the light input from the single-fiber bidirectional optical interface 3. The square tube body 2 is also provided with a transflective filter 22 arranged at 45 degrees to the radial direction of the square tube body 2, and the reflective filter 22 is used to reflect the light input from the single-fiber bidirectional optical interface 3 to the input light wavelength tunable device.

[0033] In summary, the single-fiber bidirectional wavelength tunable optical device of the present invention includes a transmitting tunable laser and an input light wavelength tunable device, which can realize the input and reception of multiple wavelengths of light. The input light wavelength tunable device includes a hot and cold driver, an FP standard and a thermistor. The FP standard is arranged in the middle of the hot and cold driver, and the thermistor is arranged on the FP standard, which can reduce the tuning time of the input light; the transmitting tunable laser also includes a backlight detector and a beam splitter prism structure. The beam splitter prism structure is arranged in the output light path of the tunable laser chip, which is used to transmit light and reflect light according to a set ratio, and input the reflected light to the backlight detector, so that the energy of the output light wavelength can be accurately monitored.

[0034] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A single-fiber bidirectional wavelength tunable optical device, characterized in that: include: An emission tunable laser, a round square tube body, a single-fiber bidirectional optical interface, an input light wavelength tunable device and a detection receiver. The emission tunable laser and the single-fiber bidirectional optical interface are fixed at both ends of the round square tube body, the input light wavelength tunable device is fixed on one side of the round square tube body, the detection receiver is fixedly connected to the input light wavelength tunable device, and the input light wavelength tunable device includes a hot and cold driver, an FP standard tool and a thermistor. The FP standard tool is arranged in the middle of the hot and cold driver, and the thermistor is arranged on the FP standard tool.

2. The single-fiber bidirectional wavelength tunable optical device according to claim 1, characterized in that: A central light transmission window is arranged in the middle of the hot and cold actuator, and the FP standard tool is arranged on the central light transmission window.

3. The single-fiber bidirectional wavelength tunable optical device according to claim 1, characterized in that: The FP etalon adopts a dual-cavity design.

4. The single-fiber bidirectional wavelength tunable optical device according to claim 1, characterized in that: The input light wavelength tunable device also includes a heat conduction base and a hemispherical glass lens, a light detector, and a beam splitter prism arranged on the heat conduction base. The beam splitter prism is used to divide a certain proportion of the input light to the light detector. The light detector is used to detect the size of the light separated by the beam splitter prism and generate a detection current to adjust the surface temperature of the FP etalon. The hemispherical glass lens is used to receive the input light passing through the FP etalon, converge it, and transmit it to the detection receiver.

5. The single-fiber bidirectional wavelength tunable optical device according to claim 4, characterized in that: The input light wavelength tunable device also includes a positioning carrier engaged with the heat transfer base.

6. The single-fiber bidirectional wavelength tunable optical device according to claim 1, characterized in that: The emitting tunable laser comprises a multilayer ceramic circuit and a tunable laser chip, a silicon substrate and a collimating lens arranged in the multilayer ceramic circuit. The tunable laser chip is used to output a light beam of a set wavelength; The silicon substrate is used to introduce the signals of the tunable laser chip and the backlight detector into the multilayer ceramic circuit; The collimating lens is used to convert the light output by the tunable laser chip from a convergent light beam into a parallel light beam.

7. The single-fiber bidirectional wavelength tunable optical device according to claim 6, characterized in that: The emitting tunable laser also includes a backlight detector and a beam splitter prism structure. The beam splitter prism structure is arranged in the output light path of the tunable laser chip and is used to transmit light and reflect light according to a set ratio and input the reflected light to the backlight detector.

8. The single-fiber bidirectional wavelength tunable optical device according to claim 1, characterized in that: It also includes an optical isolator arranged between the emission light tunable device and the round square tube body.

9. The single-fiber bidirectional wavelength tunable optical device according to claim 1, characterized in that: The square tube body is also provided with a transflective filter perpendicular to the radial direction of the square tube body, and the transflective filter is used to transmit the output light of the tunable laser and reflect the light input from the single-fiber bidirectional optical interface.

10. The single-fiber bidirectional wavelength tunable optical device according to claim 1, characterized in that: The square tube body is also provided with a transflective filter arranged at 45 degrees to the radial direction of the square tube body, and the reflective filter is used for secondary reflection of the light input from the single-fiber bidirectional optical interface to the input light wavelength tunable device.

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