CN219760244U - Wave division type super-radiation LED combined ultra-wideband light source - Google Patents
Wave division type super-radiation LED combined ultra-wideband light source Download PDFInfo
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Abstract
The utility model belongs to the technical field of semiconductor photoelectric devices, and particularly relates to a wavelength division type ultra-wideband light source combined by ultra-radiation light emitting diodes. On the basis of the wavelength division multiplexing coupling technology, the utility model provides 4 SLED chips with different wavelengths, all optical elements are assembled on a heat sink with smaller area in a combined way through the reflection and transmission combination of the wavelength division optical filters, and the wavelength division multiplexing and the space coupling are carried out to form the ultra-wideband light source. The ultra-wideband light source is packaged in a 14 pin butterfly tube. The 4 SLED chips and other optical components share one set of temperature detection (thermistor) and temperature control (semiconductor refrigerator TEC chip) to realize a single-tube SLED ultra-wideband light source, so that the volume and cost of the same ultra-wideband light source adopting the conventional optical fiber beam combining technology are greatly reduced, the complexity of temperature control and driving circuits of a plurality of SLEDs is greatly reduced, and the stability of the ultra-wideband light source in long-term use is improved.
Description
Technical Field
The utility model belongs to the technical field of semiconductor photoelectric devices, and particularly relates to a wavelength division super-radiation diode (SLED) combined ultra-wideband light source.
Background
Optical coherence imaging (Optical Coherence Tomograph) technology has been widely used in medical, sensing, cosmetic and other fields, while an important optoelectronic device in OCT imaging systems is the superluminescent diode (Superluminescent Light Emitting Diode, SLED) semiconductor broadband light source. Unlike conventional semiconductor Lasers (LD) with very narrow spectra (< 0.5 nm), the spectral width of SLEDs is relatively broad, typically greater than 30nm. According to the formula of OCT optical coherence imaging longitudinal resolution:
where lambda is 0 Is the wavelength of OCT light source, delta λ Is the spectral width of the light source, delta l Is the longitudinal resolution of OCT. Clearly, Δ λ The wider the longitudinal resolution delta of OCT l The smaller the resolution performance of coherent imaging is the better.
Limited by the development technology of SLED chips, the 3dB bandwidth of the emission spectrum of a SLED light source device with short wavelength (800 nm-900 nm) used by OCT is only 40-50 nm, and the longitudinal resolution Deltal of OCT is limited to about 10 um. While high resolution OCT systems require SLED light source devices with ultra wideband spectra greater than 100nm to achieve higher system detection resolution. In order to realize the ultra-wideband spectral bandwidth of SLED, a method of photosynthetic beams is generally adopted, and SLED devices with different wavelengths are synthesized together, so that a wider spectrum is obtained. Fig. 1 is a scheme for realizing an ultra-wideband light source by using 2-4 SLED devices which are commonly adopted at present. Obviously, the broadband light source scheme is large in size, high in cost and difficult to miniaturize. There are also a minimum of 3 optics (2×sled) and a maximum of 7 optics (4×sled). Additional optical power loss (at least 3dB per fiber beam coupler) is added due to the use of fiber beam couplers. And moreover, a plurality of SLED devices are difficult to control, and temperature and current control needs to be respectively carried out on 2-4 independent SLED devices, so that the complexity of a circuit is increased.
Disclosure of Invention
Aiming at the defects of the prior art, the utility model provides a wavelength division super-radiation diode (SLED) combined ultra-wideband light source, which aims to solve the technical problems that the existing SLED semiconductor wideband light source increases extra optical power loss due to the use of an optical fiber beam coupler, and a plurality of SLED devices need independent temperature and current control, thereby increasing the complexity of a circuit.
The utility model provides a wavelength division super-radiation diode (SLED) combined ultra-wideband light source, which comprises the following specific technical scheme:
the wavelength division type ultra-wideband ultra-radiation diode (SLED) combined light source comprises a first SLED chip, a second SLED chip, a third SLED chip, a fourth SLED chip, a first wavelength division filter, a second wavelength division filter, a third wavelength division filter and a total reflection mirror, wherein an outgoing end of the first SLED chip is aligned with the first wavelength division filter through the first collimating lens, an included angle between a plane where one end face of the first wavelength division filter is located and an optical axis of the first collimating lens is 45 degrees, an outgoing end of the second SLED chip is aligned with the second wavelength division filter through the second collimating lens, an included angle between a plane where one end face of the second wavelength division filter is located and an optical axis of the second collimating lens is 45 degrees, an outgoing end of the third SLED chip is aligned with the third wavelength division filter through the third collimating lens, an included angle between a plane where one end face of the third wavelength division filter is located and an optical axis of the third collimating lens is 45 degrees, an outgoing end of the third SLED chip is aligned with the total reflection lens through the fourth collimating lens, an outgoing end of the third collimating lens is aligned with the total reflection lens is 45 degrees, an included angle between the third wavelength division lens and the third wavelength division filter is aligned with the third wavelength division filter. The first collimating lens, the second collimating lens, the third collimating lens and the fourth collimating lens respectively collimate the output light of the first SLED chip, the second SLED chip, the third SLED chip and the fourth SLED chip into parallel light beams which are respectively incident on the first wavelength division filter, the second wavelength division filter, the third wavelength division filter and the total reflection mirror, the total reflection mirror is used for completely reflecting the output light of the fourth SLED chip to the third wavelength division filter, the third wavelength division filter is used for transmitting the reflected light of the total reflection mirror to the second wavelength division filter, and completely reflecting the output light of the third SLED chip to the second wavelength division filter, the second wavelength division filter is used for transmitting the output light of the third wavelength division filter to the first wavelength division filter, and completely reflecting the output light of the second SLED chip to the first wavelength division filter, and the first wavelength division filter is used for transmitting the output light of the second wavelength division filter, and completely reflecting the output light of the first SLED chip. And then the output light of the first SLED chip, the second SLED chip, the third SLED chip and the fourth SLED chip is subjected to wavelength division multiplexing and space coupling through the optical path, and the combined parallel light is output.
In certain embodiments, the first SLED chip has a wavelength λ 1 The wavelength of the second SLED chip is lambda 2 The wavelength of the third SLED chip is lambda 3 The wavelength of the fourth SLED chip is lambda 4 ，λ 1 <λ 2 <λ 3 <λ 4 . Since the wavelengths of the first SLED chip, the second SLED chip, the third SLED chip and the fourth SLED chip are changed from small to large, the first wavelength division filter, the second wavelength division filter and the third wavelength division filterThe wavelength division filters all have optical high-pass properties, but the corresponding optical cut-off frequencies are quite different, with the cut-off wavelengths being in order from short to long.
In some embodiments, the dual-wavelength light source comprises a tube shell, a TEC refrigerator and a heat sink, wherein a cavity is arranged in the tube shell, pins electrically isolated from the tube shell penetrate through the side surface of the cavity, the TEC refrigerator is arranged on the inner bottom surface of the cavity, the cold surface of the TEC refrigerator faces upwards, the heat sink is fixed on the cold surface of the TEC refrigerator, the first SLED chip, the second SLED chip, the third SLED chip and the fourth SLED chip are arranged side by side and are respectively fixed on the heat sink through transition heat sinks, and the first collimating lens, the second collimating lens, the third collimating lens, the fourth collimating lens, the first wavelength division filter, the second wavelength division filter, the third wavelength division filter and the total reflection mirror are all fixed on the heat sink. And the first LED chip, the second SLED chip, the third SLED chip and the fourth SLED chip jointly use a set of temperature detection and temperature control (TEC temperature controller) to realize a single-tube SLED ultra-wideband light source.
Further, the positive and negative electrodes of the first SLED chip are respectively connected with the ends of the twelfth pin and the thirteenth pin which are positioned in the cavity through wires, the positive and negative electrodes of the second SLED chip are respectively connected with the ends of the tenth pin and the eleventh pin which are positioned in the cavity through wires, the positive and negative electrodes of the third SLED chip are respectively connected with the ends of the eighth pin and the ninth pin which are positioned in the cavity through wires, and the positive and negative electrodes of the fourth SLED chip are respectively connected with the ends of the sixth pin and the seventh pin which are positioned in the cavity through wires.
Further, the positive electrode and the negative electrode of the TEC refrigerator are respectively connected with the end parts of the first pin and the fourteenth pin which are positioned in the cavity through wires.
Further, the TEC refrigerator further comprises a thermistor arranged on the cold face of the TEC refrigerator, and two ends of the thermistor are respectively connected with the ends of a fourth pin and a fifth pin which are positioned in the cavity through wires. The thermistor is mounted on the ceramic pad.
Further, the emergent end of the first wavelength division filter is aligned with the output optical fiber through a focusing lens. The output optical fiber is positioned at the focusing position of the focusing lens, and the last wavelength division multiplexing parallel light beams of the first SLED chip, the second SLED chip, the third SLED chip and the fourth SLED chip are coupled to the output optical fiber through the focusing lens.
Still further still, still include the PD detector chip of installing on the cold face of TEC refrigerator, PD detector chip aim at the output light path of first wavelength division filter and be close to focusing lens, PD detector chip's positive negative pole passes through the wire and links to each other with the tip that is located the second pin and the third pin in the cavity respectively. The PD detector chip is arranged on the light path side after the wave division and beam combination, so that the total output optical power can be conveniently monitored, and the optical signal feedback control can be realized.
The utility model has the following beneficial effects: on the basis of the wavelength division multiplexing coupling technology, the utility model provides 4 SLED chips with different wavelengths, all optical elements are assembled on a heat sink with smaller area in a combined way through the reflection and transmission combination of the wavelength division optical filters, and the wavelength division multiplexing and the space coupling are carried out to form the ultra-wideband light source. The ultra-wideband light source is packaged in a 14 pin butterfly tube. The 4 SLED chips and other optical components share one set of temperature detection (thermistor) and temperature control (semiconductor refrigerator TEC chip) to realize a single-tube SLED ultra-wideband light source, so that the volume and cost of the same ultra-wideband light source adopting the conventional optical fiber beam combining technology are greatly reduced, the complexity of temperature control and driving circuits of a plurality of SLEDs is greatly reduced, and the stability of the ultra-wideband light source in long-term use is improved.
Drawings
Fig. 1 is a schematic diagram of a SLED ultra-wideband light source structure employing an optical fiber combiner in the prior art: 2 SLED devices (a), 3 SLED devices (b) and 4 SLED devices (c) are combined to form an ultra-wideband light source;
FIG. 2 is a schematic plan view of a wavelength division super-radiation diode (SLED) combined ultra-wideband light source according to embodiment 1 of the present utility model;
FIG. 3 is a circular spot displayed on a computer screen of a beam analyzer after the SLED chip is collimated by a microlens in example 1 of the present utility model;
FIG. 4 is a schematic plan view of a heat sink assembly after 4 collimating lenses are coupled in accordance with embodiment 1 of the present utility model;
FIG. 5 is a spectral plot of the simulated output of 4 SLED chips and three wavelength division filters in example 1 of the present utility model;
FIG. 6 is a graph of the ultra wideband spectrum simulation result after the 4 SLED chips in the embodiment 1 of the present utility model are combined and coupled by three wavelength division filters and a total reflection mirror;
fig. 7 is a schematic diagram of the optical path structure of a wavelength division super-radiation diode (SLED) combined ultra-wideband light source in embodiment 1 of the present utility model.
Detailed Description
The present utility model will be further described in detail below with reference to specific embodiments and with reference to the accompanying drawings, in order to make the objects, technical solutions and advantages of the present utility model more apparent.
Example 1
The wavelength division super-radiation diode (SLED) combined ultra-wideband light source provided by the embodiment has the following specific technical scheme:
as shown in fig. 2, the wavelength division super-radiation diode (SLED) combined ultra-wideband light source comprises a tube shell 4, a TEC refrigerator 41 and a heat sink 42, wherein a cavity is arranged in the tube shell 4, 14 pins penetrate through the side surface of the cavity, the TEC refrigerator 41 is arranged on the inner bottom surface of the cavity, the cold surface of the TEC refrigerator 41 faces upwards, the heat sink 42 is fixed on the cold surface of the TEC refrigerator 41, the first SLED chip 11, the second SLED chip 12, the third SLED chip 13 and the fourth SLED chip 14 are arranged side by side and are respectively fixed on the heat sink 42 through a transition heat sink 15, and the first collimating lens 21, the second collimating lens 22, the third collimating lens 23, the fourth collimating lens 24, the first wavelength division filter 31, the second wavelength division filter 32, the third wavelength division filter 33 and the total reflection mirror 34 are all fixed on the heat sink 42. The surface size of the heat sink 42 in this embodiment is 17X 6mm 2 。
The positive and negative electrodes of the TEC refrigerator 41 are connected to the ends of the fourteenth pin 431 and the first pin 445 in the cavity through wires, respectively. Exit end of first SLED chip 11 is led toThe first collimating lens 21 is aligned with the first wavelength division filter 31, the exit end of the second SLED chip 12 is aligned with the second wavelength division filter 32 through the second collimating lens 22, the exit end of the third SLED chip 13 is aligned with the third wavelength division filter 33 through the third collimating lens 23, and the exit end of the third SLED chip 13 is aligned with the total reflection mirror 34 through the fourth collimating lens 24. The first wavelength division filter 31, the second wavelength division filter 32, the third wavelength division filter 33, and the total reflection mirror 34 are all installed on the optical paths of the first collimating lens 21, the second collimating lens 22, the third collimating lens 23, and the fourth collimating lens 24 at 45 ° angles. The exit end of the total reflection mirror 34 is aligned with the third wavelength division filter 33, the exit end of the third wavelength division filter 33 is aligned with the second wavelength division filter 32, the exit end of the second wavelength division filter 32 is aligned with the first wavelength division filter 31, and the exit end of the first wavelength division filter 31 is aligned with the output optical fiber 47 through the focusing lens 46. Thus, the light beams of the 4 SLEDs with different wavelengths can be converged at the focusing lens 46 and output to the optical fiber 47, and wavelength division multiplexing is completed to form the ultra-wideband light source. The wavelength of the first SLED chip 11 is lambda 1 The wavelength of the second SLED chip 12 is lambda 2 The wavelength of the third SLED chip 13 is lambda 3 The wavelength of the fourth SLED chip 14 is lambda 4 ，λ 1 <λ 2 <λ 3 <λ 4 . Specifically, the positive and negative electrodes of the first SLED chip 11 are connected to the ends of the thirteenth pin 432 and the twelfth pin 433 in the cavity respectively through wires, the positive and negative electrodes of the second SLED chip 12 are connected to the ends of the eleventh pin 434 and the tenth pin 435 in the cavity respectively through wires, the positive and negative electrodes of the third SLED chip 13 are connected to the ends of the ninth pin 436 and the eighth pin 437 in the cavity respectively through wires, and the positive and negative electrodes of the fourth SLED chip 14 are connected to the ends of the seventh pin 438 and the sixth pin 439 in the cavity respectively through wires.
A thermistor 45 is also installed on the cold face of the TEC refrigerator 42, and two ends of the thermistor 45 are respectively connected with ends of a fifth pin 441 and a fourth pin 442 which are positioned in the cavity through wires.
A PD detector chip 48 is also mounted on the cold face of the TEC refrigerator 42, the PD detector chip 48 is aligned with the output optical path of the first wavelength division filter 31 and is close to the focusing lens 46, and the positive and negative poles of the PD detector chip 48 are connected with the ends of the third pin 443 and the second pin 444 located in the cavity through wires, respectively.
The specific assembly process of the wavelength division super-radiation diode (SLED) combined ultra-wideband light source provided by the embodiment is as follows:
1. heat sink assembly and collimating lens coupling
The 4 SLED chips (first SLED chip 11, second SLED chip 12, third SLED chip 13 and fourth SLED chip 14) having different wavelengths are respectively mounted on four transition heat sinks 15 (COCs) through solder, and a first SLED-COC module, a second SLED-COC module, a third SLED-COC module and a fourth SLED-COC module are respectively obtained. The four SLED-COC modules described above were assembled side-by-side with solder on heatsink 42 to form a heatsink assembly.
The heat sink assembly is fixed on a three-dimensional adjusting table with constant temperature control, a clamping jaw with five-dimensional adjusting function is used for placing a first collimating lens 21 in front of the light emitting surface of a first SLED chip 11, a SLED driving current source is used for applying driving current to the first SLED chip 11, the light emitted by the first SLED chip 11 is collimated to a beam analyzer through the first collimating lens 21, and a circular light spot diagram shown in figure 3 is displayed on a computer screen of the beam analyzer. By carefully adjusting the jaws, the position of the first collimating lens 21 is made to minimize the spot received by the beam analyzer, and the radius and shape of the circular spot are almost unchanged when the distance from the beam analyzer to the first collimating lens 21 is moved from near (> 10 mm) to far (< 100 mm), at which time the position of the first collimating lens 21 is optimal, and the size and position of the circular spot are recorded. The first collimating lens 21 is fixed with UV glue. And adjusting the three-dimensional adjusting table, moving out the first SLED chip 11 coupled with the first collimating lens 21, moving the second SLED chip 12 needing to be coupled with the lens to the accurate position of the first SLED chip 11, and performing subsequent operation consistent with the step of coupling the first collimating lens 21 with the first SLED chip 11. After the coupling and fixing of the second collimating lens 22 are completed, the third collimating lens 23 is coupled to the third SLED chip 13, and the fourth collimating lens 24 is coupled to the fourth SLED chip 14 according to the same steps, which will not be described herein. The heat sink assembly after 4 collimating lens couplings is completed is shown in fig. 4.
2. Assembly within a heat sink assembly housing 4 and coupling of a wavelength division filter
The 14-pin butterfly tube 4 has the TEC refrigerator 41 assembled at the bottom of the butterfly tube 4 by soldering, the cold side of the TEC refrigerator 41 faces upwards, the positive electrode thereof is connected with the fourteenth pin 431, and the negative electrode thereof is connected with the 1 st pin 445. And the heat sink assembly after the collimating lens is coupled is assembled on the TEC refrigerator 41 by soldering tin, and the anode and the cathode of each SLED chip are welded with corresponding pins through gold wires. A thermistor 45 is also mounted on the heat sink 42 via a ceramic insulating pad. The three-dimensional adjusting table can finely adjust the position of the tube shell 4, and is convenient for coupling the wavelength division optical filter. First, the first wavelength division filter 31 is coupled, and the clamping jaw with five-dimensional adjusting function places the first wavelength division filter 31 at the light emergent position of the first collimating lens 21 at an angle of 45 degrees. A driving current is applied to the first SLED chip 11 with a driving power supply. By adjusting the clamping jaw, the output light of the first chip 11 is reflected out of the light outlet of the tube shell through the first collimating lens 21 and the first wavelength division filter 31 with an angle of 45 degrees, and the light beam can be received by a light beam analyzer outside the light outlet of the tube shell 4, and corresponding round light spots can be seen on a computer screen. The jaws are carefully adjusted to minimize the circular spot, and the beam analyzer is moved from near to far away from the open housing 4, with the circular spot having almost unchanged size and shape. After the adjustment, the first wavelength division filter 31 is fixed by using UV glue and cured by using the UV lamp 5, and after the clamping jaw is released, the circular light spot on the computer screen of the beam analyzer is kept unchanged. Thus, the first wavelength division filter 31 is adjusted and fixed, and the positions of the second wavelength division filter 32, the third wavelength division filter 33 and the total reflection mirror 34 are accurately adjusted and fixed by the same method and process flow. During the adjustment and assembly of the second wavelength division filter 32, the third wavelength division filter 33 and the total reflection mirror 34, special attention should be paid to the fact that the center light spots emitted by the four SLED chips through the wavelength division filter and the total reflection mirror 34 on the computer screen of the light beam analyzer are required to be in the same position and completely coincide, so as to complete the heat sink 42 tube shell 4 assembly with the optimal coupling efficiency. The spectra of the analog outputs of the 4 SLED chips and the three wavelength division filters in this example are shown in fig. 5. The ultra wideband spectrum simulation results of the 4 SLED chips after beam combination and coupling through the three wavelength division filters and the total reflection mirror are shown in figure 6.
3. Coupling of a combined output beam focusing lens 46 and a focusing fiber
The drive power supplies drive current to the TEC cooler 42 of the butterfly case 4 and to the four SLED chips simultaneously. The jaws with five-dimensional adjustment function place the focusing lens 46 in the output path of the four SLED chip multiplexed beams. The clamping jaw with five-dimensional adjustment functions places the output fiber 47 at the focal point of the focusing lens 46. The output optical connector of the output optical fiber 47 is inserted into the input end of the optical power meter. The jaws holding the focusing lens 46 and the jaws holding the output fiber 47 were carefully and repeatedly adjusted to maximize the combined output optical power from the 4 SLED chips. And the output optical connector of the output optical fiber 47 is inserted into the input end of the spectrum analyzer, and the clamping jaw for clamping the focusing lens 46 and the clamping jaw for clamping the output optical fiber 47 are carefully and repeatedly adjusted, so that the spectrum displayed by the spectrum analyzer is widest and flattest. At this time, the focusing lens 46 is coated with UV gel and cured by a UV lamp. After the focusing lens 46 is fixed, the clamping jaw is released. The output fiber 47 is carefully adjusted, a nickel bracket is placed on the output fiber, the nickel bracket is spot welded by a laser welding machine, and the output fiber 47 is fixed on the heat sink 42. An optical path diagram of the wavelength division superluminescent diode (SLED) combined ultra-wideband light source in this embodiment is shown in fig. 7.
In summary, the utility model proposes to use 4 SLED chips with different wavelengths based on the wavelength division multiplexing coupling technology, and combine all optical elements on the heat sink 42 with smaller area through 45 ° angle reflection and transmission combination of the wavelength division optical filter, and wavelength division multiplexing and space coupling to form the ultra-wideband light source. The ultra-wideband light source is packaged in a 14-pin butterfly-shaped tube housing 4. The 4 SLED chips and other optical components share one set of temperature detection (thermistor) and temperature control (semiconductor refrigerator TEC chip) to realize a single-tube SLED ultra-wideband light source, so that the volume and cost of the same ultra-wideband light source adopting the conventional optical fiber beam combining technology are greatly reduced, the complexity of temperature control and driving circuits of a plurality of SLEDs is greatly reduced, and the stability of the ultra-wideband light source in long-term use is improved.
The above preferred embodiments of the present utility model are not limited to the above examples, and the present utility model is not limited to the above examples, but can be modified, added or replaced by those skilled in the art within the spirit and scope of the present utility model.
Claims (8)
1. The wavelength division type ultra-radiation light-emitting diode combined ultra-wideband light source is characterized by comprising a first SLED chip, a second SLED chip, a third SLED chip, a fourth SLED chip, a first wavelength division filter, a second wavelength division filter, a third wavelength division filter and a total reflection mirror, wherein the emergent end of the first SLED chip is aligned with the first wavelength division filter through a first collimating lens, the emergent end of the second SLED chip is aligned with the second wavelength division filter through a second collimating lens, the emergent end of the third SLED chip is aligned with the third wavelength division filter through a third collimating lens, the emergent end of the third SLED chip is aligned with a total reflection mirror through a fourth collimating lens, the emergent end of the total reflection mirror is aligned with the third wavelength division filter, the emergent end of the third wavelength division filter is aligned with the second wavelength division filter, and the emergent end of the second wavelength division filter is aligned with the first wavelength division filter.
2. The wavelength division superluminescent diode combined ultra-wideband light source of claim 1, wherein the wavelength of the first SLED chip is λ 1 The wavelength of the second SLED chip is lambda 2 The wavelength of the third SLED chip is lambda 3 The wavelength of the fourth SLED chip is lambda 4 ，λ 1 <λ 2 <λ 3 <λ 4 。
3. The wavelength division super-radiation light-emitting diode (LED) combined ultra-wideband light source according to claim 1, comprising a tube shell, a TEC refrigerator and a heat sink, wherein the tube shell is provided with a cavity, 14 pins are arranged on the side surface of the cavity, the TEC refrigerator is arranged on the inner bottom surface of the cavity, the cold surface of the TEC refrigerator faces upwards, the heat sink is fixed on the cold surface of the TEC refrigerator, the first SLED chip, the second SLED chip, the third SLED chip and the fourth SLED chip are arranged side by side and are fixed on the heat sink through transition heat sinks respectively, and the first collimating lens, the second collimating lens, the third collimating lens, the fourth collimating lens, the first wavelength division filter, the second wavelength division filter, the third wavelength division filter and the total reflection mirror are all fixed on the heat sink.
4. The wavelength division superluminescent diode combined superwideband light source of claim 3, wherein the positive and negative electrodes of the first SLED chip are connected with the ends of the twelfth pin and the thirteenth pin respectively through wires, the positive and negative electrodes of the second SLED chip are connected with the ends of the tenth pin and the eleventh pin respectively through wires, the positive and negative electrodes of the third SLED chip are connected with the ends of the eighth pin and the ninth pin respectively through wires, and the positive and negative electrodes of the fourth SLED chip are connected with the ends of the sixth pin and the seventh pin respectively through wires.
5. The wavelength division superluminescent diode combined ultra-wideband light source of claim 3, wherein the positive and negative electrodes of the TEC refrigerator are connected with the ends of the first pin and the fourteenth pin respectively through wires.
6. The wavelength division superluminescent diode combined ultra-wideband light source of claim 3, further comprising a thermistor mounted on the cold face of the TEC refrigerator, wherein two ends of the thermistor are connected with ends of the fourth pin and the fifth pin respectively through wires.
7. The wavelength division superluminescent diode combined ultra-wideband light source of claim 3, wherein the exit end of the first wavelength division filter is aligned with the output fiber by a focusing lens.
8. The wavelength division super luminescent diode (tcd) combined ultra wideband light source according to claim 7, further comprising a PD detector chip mounted on the cold side of the TEC refrigerator, the PD detector chip being aligned to the output optical path of the first wavelength division filter and close to the focusing lens, the positive and negative electrodes of the PD detector chip being connected to the ends of the second and third pins, respectively, by wires.
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| CN202321353355.XU CN219760244U (en) | 2023-05-30 | 2023-05-30 | Wave division type super-radiation LED combined ultra-wideband light source |
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| CN202321353355.XU CN219760244U (en) | 2023-05-30 | 2023-05-30 | Wave division type super-radiation LED combined ultra-wideband light source |
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