Optical fiber vacuum thermostat for coherent Isin machine
Through the vacuum constant temperature device, the problem of long-distance optical fibers in coherent Isin machines being affected by temperature changes is solved, and the stable control of fiber temperature is achieved and the stability of the computing device is improved.
Patent Information
- Application Number
- CN202510203376.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-24
- Publication Date
- 2025-08-05
AI Technical Summary
The long-distance optical fibers in coherent Isin machines are affected by ambient temperature changes and air disturbances, resulting in unstable computing devices.
A vacuum constant temperature device is adopted, including a vacuum cavity, a shielding cover and a temperature control unit, which isolates external disturbances through a vacuum interlayer, and combines an optical fiber carrier with excellent thermal conductivity and a uniformly distributed semiconductor thermoelectric device to achieve accurate temperature control of the optical fiber.
The constant temperature of long-distance fiber is achieved, reducing the impact of the external environment on the fiber, and improving the computing stability and reliability of coherent Isin machines.
Smart Images
Figure CN120428375A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the fields of optical computing technology, automatic temperature control, and in particular to a vacuum constant temperature control device for a long-distance optical fiber of a coherent Ising machine. Background Art
[0002] A coherent Ising machine (CIM) is a device that uses laser pulses in an optical oscillator ring to encode information and perform computations. This computing device has the advantage of being able to solve combinatorial optimization problems, which are difficult for classical computers to solve in polynomial time. Classical computers operate on semiconductor integrated circuits, but the CIM's defining feature is its use of the coherent evolution of light to perform computations. Specifically, it uses the light pulses in the optical oscillator ring as information units. Dynamic coupling is achieved between the light pulses based on the specific problem to be solved. When the system evolves to a stable state of light pulse combinations that minimizes energy loss, this state information corresponds to the solution to the combinatorial optimization problem. Currently, coherent Ising machines commonly use long-distance optical fiber as a key component of the oscillator ring. The longer the fiber (ranging from a few kilometers to tens of kilometers), the more light pulses it can accommodate, and the larger the scale of the problems the system can solve. The stability of long-distance optical fiber is a key issue affecting the system. Temperature fluctuations and air disturbances (such as sound waves) in the environment can cause changes in the refractive index and length of optical fibers, leading to changes in the polarization state and phase of the optical pulses within the fiber, which can cause instability in the entire CIM computing device. Therefore, maintaining a constant temperature over long distances of optical fiber within the CIM, free from external air disturbances and ensuring stable and normal operation of the computing system, is a critical issue in CIM. Summary of the Invention
[0003] The present invention aims to address the problem of unstable operation of CIM calculation devices due to the significant impact of ambient temperature changes and air disturbances on long-distance optical fibers in CIM. The present invention provides a CIM-specific optical fiber vacuum temperature control device. This device can maintain a constant temperature over long distances in CIM, unaffected by external air disturbances, and thus ensure stable operation of large-scale CIMs.
[0004] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is a fiber optic vacuum constant temperature device for a coherent Ising machine, comprising a base, an external bracket, a vacuum cavity, a shielding cover, an optical fiber carrier, and a temperature control unit, wherein the vacuum cavity comprises a cavity bottom plate and a cavity shell; the base is located below the entire vacuum cavity as a support and support; the external bracket is located above the base and below the cavity bottom plate, supporting the cavity bottom plate and the entire cavity shell; an optical fiber interface and a cable interface are provided on the cavity bottom plate to realize the interconnection of optical fibers and cables inside and outside the vacuum cavity; the cavity shell is connected to the cavity bottom plate through an O-ring, and a vacuum valve interface is provided on the cavity shell for a vacuum pump to form a vacuum interlayer between the vacuum cavity and the shielding cover. Since the number of molecules in the vacuum interlayer is extremely small, the inside of the vacuum cavity is evacuated; it can isolate external air disturbances and reduce heat conduction and heat convection between the external environment and internal components. The vacuum chamber is typically a double-layer stainless steel enclosure, typically cylindrical or rectangular. Evenly distributed electric heating elements or semiconductor thermoelectric devices are installed on the outer shell of the vacuum chamber. The stainless steel enclosure is ideal for mounting several evenly distributed electric heating elements or thermostatically controlled semiconductor thermoelectric devices. Electric heating elements can maintain a uniform temperature above room temperature. TEC devices are not subject to this limitation.
[0005] The shielding cover includes a built-in bracket, a shielding cover bottom plate, and a shielding cover shell; the built-in bracket is located above the cavity bottom plate and below the shielding cover bottom plate, and the built-in bracket is made of low thermal conductivity material to avoid direct heat conduction between the vacuum cavity bottom plate and the internal components of the shielding cover. The low thermal conductivity material is especially a polymer material; the shielding cover bottom plate contains optical fiber holes and multiple ventilation holes. The optical fiber holes are used to connect the optical fibers inside and outside the shielding cover, and the ventilation holes are used to discharge the air in the shielding cover when vacuuming; the shielding cover shell is fixed above the shielding cover bottom plate; the shielding cover bottom plate and the shielding cover shell are both made of metal materials with excellent thermal conductivity; heaters or semiconductor thermoelectric devices TEC (TEC refers to semiconductor materials or devices used for thermoelectric conversion) are evenly installed on the shielding cover shell; the optical fiber carrier is used to fix the optical fiber and is placed inside the shielding cover and above the shielding cover bottom plate.
[0006] The fiber carrier is made of a cylindrical metal material with excellent thermal conductivity to prevent hard bending of the fiber during winding and to ensure uniform temperature of the fiber. The fiber is interconnected to the outer vacuum chamber through fiber holes in the shielding cover bottom plate and fiber interfaces in the cavity bottom plate. The heater or semiconductor thermoelectric device is controlled by a temperature control unit.
[0007] The temperature control unit adopts active temperature control technology, including a temperature sensor, a temperature adjustment execution module (i.e., a heater or a semiconductor thermoelectric device), and a temperature control module; the temperature sensor is placed on the bottom plate of the shielding cover to monitor the temperature of the shielding cover (i.e., the temperature of the optical fiber carrier) in real time, and the electrical signal is fed back to the temperature control module outside the vacuum cavity through the electrical signal line and the cable interface on the bottom plate of the cavity; the temperature adjustment execution module is attached to the shielding cover.
[0008] The present invention has the following beneficial effects: A vacuum cavity, external supports, and a vacuum interlayer achieve primary isolation from external heat transfer and air disturbances; a shielding cover, internal supports, and a shielding cover with high reflectivity and uniform surface temperature further achieve thermal isolation and air shielding outside the shielding cover, forming secondary isolation from the external environment; a cylindrical optical fiber carrier with excellent thermal conductivity reduces optical fiber loss and ensures uniform optical fiber temperature; and an active temperature control unit and uniformly distributed semiconductor thermoelectric devices achieve precise control of optical fiber temperature with an accuracy better than ±0.01°C. Therefore, the present invention ensures that the polarization state and optical pulse phase of a long-distance optical fiber placed in a vacuum constant temperature device in a CIM are not affected by external temperature changes and air disturbances, and can actively and precisely control its temperature to further maintain a constant temperature, thereby enabling the CIM computing device to operate stably for a long time, greatly improving the stability of the coherent Ising machine, and solving a long-standing problem in the field. BRIEF DESCRIPTION OF THE DRAWINGS
[0009] Figure 1 This is a theoretical schematic diagram of an optical fiber vacuum constant temperature device for a coherent Ising machine according to the present invention.
[0010] Figure 2 This is a diagram of an embodiment of a fiber optic vacuum thermostat for a coherent Ising machine according to the present invention. DETAILED DESCRIPTION
[0011] The present invention will now be further described in detail with reference to specific embodiments and accompanying drawings. The selected specific embodiments are intended only to more clearly illustrate the present invention and are not intended to limit the scope of the present invention. Any equivalent modifications and equivalent substitutions made within the scope of the present invention shall be included within the scope of the appended claims.
[0012] Fiber optic vacuum thermostat for coherent Ising machine (eg Figure 2 ), including a base, external bracket, vacuum chamber, shielding cover, fiber carrier, and temperature control unit. Base 1, external bracket 2, chamber bottom plate 3, chamber housing 4, fiber port 5, cable port 6, vacuum port 7, internal bracket 8, shielding cover bottom plate 9, shielding cover housing 10, fiber port 11, fiber carrier 12, temperature sensor and temperature actuator module 13, and temperature control module 14.
[0013] The base is located at the bottom of the entire vacuum chamber, serving as a support to enhance the stability of the entire system structure. The external bracket, composed of multiple rods, is located above the base and below the chamber floor, supporting the chamber floor and the entire chamber shell core, reducing the base's impact on the temperature of the chamber floor and other components, and providing a certain degree of thermal insulation. The vacuum chamber includes: a chamber floor and a chamber shell. The chamber floor contains optical fiber interfaces and cable interfaces to interconnect optical fibers and cables inside and outside the vacuum chamber. The chamber shell is connected to the chamber floor via an O-ring. A vacuum valve interface is provided on the chamber shell for a vacuum pump to evacuate the interior of the vacuum chamber, forming a vacuum interlayer between the vacuum chamber and the shielding cover. The vacuum interlayer can isolate external air disturbances and reduce heat conduction and heat convection between the external environment and internal components.
[0014] Preferably, the vacuum chamber is made of 304 stainless steel or aluminum alloy, which is non-magnetic, has a low rejection rate, is corrosion-resistant, and is resistant to high temperatures. It can also be used for baking, that is, a heating tape is evenly wrapped around the outer shell of the chamber and fixed with aluminum foil. The baking temperature is set within 50°C to further improve the vacuum degree. The vacuum degree generally reaches ~10 -7 hPa is enough, and a molecular pump set can be selected to cooperate with vacuum extraction.
[0015] The shielding cover includes: a built-in bracket, a shielding cover bottom plate, and a shielding cover shell. The built-in bracket is composed of multiple rods and is located above the cavity bottom plate and below the shielding cover bottom plate. It is made of a material with excellent thermal insulation performance, which can reduce heat transfer between the internal components of the shielding cover and the cavity bottom plate. Commonly used thermal insulation materials include glass fiber reinforced composite materials: such as G11 or E-Glass, polytetrafluoroethylene; the shielding cover bottom plate contains fiber holes and multiple ventilation holes. The fiber holes are used to connect the optical fibers inside and outside the shielding cover, and the ventilation holes are used to exhaust the air in the shielding cover during vacuuming; the shielding cover shell is fixed above the shielding cover bottom plate. The shielding cover bottom plate and the shielding cover shell are both made of metal materials with excellent thermal conductivity and high surface reflectivity. The surface temperature is uniform and can shield thermal radiation. Preferably, the shielding cover bottom plate and the shielding cover shell are made of copper with excellent thermal conductivity. It is also convenient to install heaters or TEC devices.
[0016] The fiber carrier, used to secure the optical fiber, is placed within the shielding enclosure and on the bottom plate. Made of a cylindrical metal material with excellent thermal conductivity, the fiber carrier prevents the fiber from bending during winding. The fiber is evenly wound around the cylindrical carrier, maintaining a uniform temperature. The optical fiber is interconnected with the optical fiber outside the vacuum chamber via the fiber hole in the bottom plate of the shielding enclosure and the fiber interface on the cavity bottom plate.
[0017] Preferably, the vacuum chamber housing, shielding cover, and optical fiber carrier form a three-layer concentric cylindrical structure from the outside in. One to five TEC devices, for example, four or five, can be mounted within the cylinder, including the upper end of the cylinder. This facilitates the installation of the TEC device and the heat exchanger for mounting the TEC device within the vacuum chamber housing. After the two layers of stainless steel are tightly attached, holes are punched and the outer end of the heat exchanger is mounted, with the inner end of the heat exchanger in close contact with the TEC device.
[0018] Preferably, the fiber carrier is shaped like a spool, with the diameter of its two bottom surfaces slightly larger than the cylindrical middle section, with the diameter of the middle section >100 mm, to reduce fiber bending losses. The fiber carrier can also be made of materials with excellent thermal conductivity and high reflectivity, such as aluminum, copper, or silver- or gold-plated materials.
[0019] The temperature control unit utilizes active temperature control technology and includes a temperature sensor, a temperature control execution module (heater or semiconductor cooler), and a temperature control module. The temperature sensor, located on the shielding cover base, monitors the shielding cover's temperature (i.e., the temperature of the optical fiber carrier and the optical fiber carrier) in real time. This electrical signal is fed back to the temperature control module outside the vacuum chamber via an electrical signal line through a cable interface on the cavity base. The temperature control execution module, attached to the shielding cover base, acts as the executor of shielding cover temperature regulation and is connected to the temperature control module outside the vacuum chamber via an electrical control line through a cable interface on the cavity base. The temperature control module compares the collected temperature from the temperature sensor with the set temperature, performs PID calculations, and feeds back an electrical signal to the temperature control execution module to achieve heating or cooling of the shielding cover and optical fiber carrier, with a temperature control accuracy better than ±0.01°C.
[0020] Preferably, the temperature sensor is a PT1000 platinum thermal resistor.
[0021] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention without departing from the principles and purpose of the present invention.
Claims
1. An optical fiber vacuum constant temperature device for a coherent Ising machine, characterized in that: It includes a base, an external bracket, a vacuum cavity, a shielding cover, an optical fiber carrier, and a temperature control unit. The vacuum cavity includes a cavity bottom plate and a cavity shell; The base is located below the entire vacuum cavity, serving as a base and support; the external bracket is located above the base and below the cavity bottom plate, supporting the cavity bottom plate and the entire cavity shell; the cavity bottom plate is provided with an optical fiber interface and a cable interface to realize the interconnection of optical fibers and cables inside and outside the vacuum cavity; the cavity shell is connected to the cavity bottom plate through an O-ring, and a vacuum valve interface is provided on the cavity shell for the vacuum pump to evacuate the inside of the vacuum cavity.
2. The optical fiber vacuum constant temperature device for coherent Ising machine according to claim 1, characterized in that: The shielding cover includes a built-in bracket, a shielding cover bottom plate, and a shielding cover shell; The built-in bracket is located above the cavity bottom plate and below the shielding cover bottom plate. The built-in bracket is made of low thermal conductivity material to avoid direct heat conduction between the vacuum cavity bottom plate and the internal components of the shielding cover; the shielding cover bottom plate contains optical fiber holes and multiple ventilation holes. The optical fiber holes are used to connect the optical fibers inside and outside the shielding cover, and the ventilation holes are used to discharge the air in the shielding cover when vacuuming; the shielding cover shell is fixed above the shielding cover bottom plate; the shielding cover bottom plate and the shielding cover shell are both made of metal materials with high reflectivity and excellent thermal conductivity; a heater or a semiconductor thermoelectric device, namely TEC, is installed on the shielding cover. TEC refers to a semiconductor material or device used for thermoelectric conversion; the optical fiber carrier is used to fix the optical fiber and is placed inside the shielding cover and above the shielding cover bottom plate.
3. The optical fiber vacuum constant temperature device for coherent Ising machine according to claim 1, characterized in that: The cavity shell is a stainless steel double-layer sealed shell, which is cylindrical or rectangular. The cavity shell of the vacuum cavity is equipped with evenly distributed electric heating devices or heat exchange devices of semiconductor thermoelectric devices; several evenly distributed electric heating devices or constant temperature controlled semiconductor thermoelectric devices.
4. The optical fiber vacuum constant temperature device for a coherent Ising machine according to claim 1 or 2, characterized in that: The optical fiber carrier is made of a cylindrical metal material with excellent thermal conductivity to ensure uniform temperature of the optical fiber on it; the optical fiber is interconnected with the optical fiber outside the vacuum cavity through the optical fiber hole on the bottom plate of the shielding cover and the optical fiber interface on the bottom plate of the cavity; the heater or semiconductor thermoelectric device is controlled by a temperature control unit.
5. The optical fiber vacuum constant temperature device for a coherent Ising machine according to claim 1 or 2, characterized in that: The temperature control unit adopts active temperature control technology, including a temperature sensor, a temperature adjustment execution module, i.e., a heater or a semiconductor thermoelectric device, and a temperature control module; the temperature sensor is placed on the bottom plate of the shielding cover to monitor the temperature of the shielding cover, i.e., the temperature of the optical fiber carrier and the temperature in real time, and the electrical signal is fed back to the temperature control module outside the vacuum cavity through the electrical signal line and the cable interface on the bottom plate of the cavity; the temperature adjustment execution module is attached to the shielding cover.
6. The optical fiber vacuum constant temperature device for a coherent Ising machine according to claim 1 or 2, characterized in that: The shielding cover bottom plate and the shielding cover shell are made of materials with excellent thermal conductivity and high reflectivity, such as aluminum, copper, or silver-plated or gold-plated materials.
7. The optical fiber vacuum constant temperature device for a coherent Ising machine according to claim 1 or 2, characterized in that: The optical fiber carrier is used to fix the optical fiber and is placed inside the shielding cover and on the bottom plate of the shielding cover. The optical fiber carrier is made of a metal material with excellent thermal conductivity and is made into a cylindrical shape to prevent the optical fiber from being hard-bent when it is wound. The optical fiber is evenly wound on the cylindrical optical fiber carrier to maintain uniform temperature. The optical fiber is interconnected with the optical fiber outside the external vacuum cavity through the optical fiber hole on the bottom plate of the shielding cover and the optical fiber interface on the bottom plate of the cavity.
8. The optical fiber vacuum constant temperature device for a coherent Ising machine according to claim 1 or 2, characterized in that: The vacuum chamber shell, shielding cover, and optical fiber carrier form a three-layer concentric cylindrical structure from the outside to the inside. One to five TEC devices are installed inside the cylinder, and TEC devices can also be installed on the upper end surface of the cylinder.
9. The optical fiber vacuum constant temperature device for coherent Ising machine according to claim 1 or 2, characterized in that: A heat exchanger of the TEC device is installed on the outer shell of the vacuum chamber; two layers of stainless steel are pressed tightly together, holes are punched, and then the outer end of the heat exchanger is installed, and the inner end of the heat exchanger is pressed tightly against the TEC device.
10. The optical fiber vacuum constant temperature device for coherent Ising machine according to claim 1 or 2, characterized in that: The optical fiber carrier is in the shape of a winding shaft with the diameter of the two bottom surfaces slightly larger than the cylindrical middle section to prevent the optical fiber from being hard-bent when winding, thereby reducing the optical fiber bending loss; the optical fiber carrier is made of copper, aluminum, gold or silver with good thermal conductivity.