TWI586945B - Integrated power monitor with high directivity - Google Patents

Description

High directional integrated power detection device

The disclosed embodiments can provide a power detecting device, and more particularly to a highly directional integrated power detecting device having a beveled shield.

Optical fiber communication systems often use a photodetector (PD) to detect the energy of light in a fiber, that is, convert the optical signal of the light into a current signal, and use the converted current signal as a monitoring signal to control the correlation at the transmitting end. Adjustment. Generally, the optical transmission of the input 埠 fiber passes through the filter, and part of the light passes through the filter and is received by the illuminator; on the other hand, the reflected light reflected by the filter passes through the lens and enters another Output 埠 fiber, continue to transmit to the subsequent stage; due to the interface difference on the path during subsequent transmission, etc., the transmitted reflected light is generated. When the transmitted reflected light returns to the filter, it still penetrates according to the penetration ratio, which may cause partial reflected light. Entering the detector allows the detector to generate additional output current, which reduces directivity.

In order to overcome the problem that the above-mentioned transmitted reflected light penetrates into the optical detector through the filter and causes directionality, a differential wall can be fabricated between the filter and the optical detector to reduce the transmitted reflected light to the optical detector. The influence of the directionality. In addition, the optical head can be received at an angle of 8 degrees to enhance the directivity. A mask can be added to the front entrance path of the detector to mask it into the detector.

The above mentioned technology has limited ability to improve directionality, and the purpose of the disclosure is to overcome the present In view of the deficiencies in the art, a high-directional integrated power detecting device capable of simultaneously achieving volume miniaturization and effectively improving directivity is designed.

The disclosed embodiments can provide a highly directional integrated power detecting device.

One disclosed embodiment relates to a high directional integrated power detecting device comprising: a filter, a photodetector, and a shielding member that receives an incident light and generates a reflected light and a through Light transmissive; the light detector receives the transmitted light and detects energy of the transmitted light; and the shielding member has an outer surface, an inner surface, and a slit between the outer surface and the inner surface To be coated on the photodetector, wherein the photodetector is disposed in the inner surface, and the outer surface is a slope.

The above and other advantages of the present disclosure will be described in detail below with reference to the following drawings, detailed description of the embodiments, and claims.

10‧‧‧High directional integrated power detection device

11‧‧‧Filter

111‧‧‧Incoming light

112‧‧‧ Reflected light

113‧‧‧through light

12‧‧‧ Detector

13‧‧‧Shield

131‧‧‧ inner surface

132‧‧‧ slit

133‧‧‧ outer surface

21‧‧‧Fiber lead sleeve

22‧‧‧ Input 埠 fiber

23‧‧‧ Output 埠 fiber

24‧‧‧ lens

1 is a side view of a high directivity integrated power detecting device according to an embodiment of the present disclosure; FIG. 2 illustrates a high directivity integrated type including a fiber lead and a C lens according to an embodiment of the present disclosure. A side view of the power detecting device; and Figures 3a and 3b illustrate the determination of a suitable bevel in accordance with the path traveled when the reflected light returns, in accordance with an embodiment of the present disclosure.

The present disclosure relates to an integrated power detecting device, and more particularly to a highly directional integrated power detecting device having a beveled shield.

1 is a high-directional integrated power detection device according to an embodiment of the present disclosure. Set the side view of 10. Referring to FIG. 1 , the high directional integrated power detecting device 10 includes: a filter (Tap Filter) 11 that receives an incident light 111 and generates a reflected light 112 and a transmitted light 113; and a photodetector ( The photodetector, PD) 12 receives the transmitted light 113 and detects the energy of the transmitted light 113; and a shield (Cap) 13 has an outer surface, an inner surface, and a slit 132 between the outer surface and the inner surface. To cover the photodetector 12, wherein the photodetector 12 is disposed in the inner surface 131 of the shielding member 13, and the outer surface 133 of the shielding member has a slope.

In FIG. 1, the filter 11 is arranged to receive incident light 111, which is reflected by the filter 11 to generate reflected light 112, and the incident light 111 penetrates the filter 11 to generate the transmitted light 113. According to an embodiment of the present disclosure, the filter 11 may be a rectangular parallelepiped, and the two sides of the filter have an anti-reflection coating and a high-reflection coating on both sides in the horizontal direction, and the incident light 111 passes through the anti-reflection coating and the high-reflection coating, respectively.

Referring to FIG. 1, the shielding member 13 covers the optical detector 12. The inner surface 131 of the shielding member 13 may have a hollow circular shape, and a slit 132 is disposed between the outer surface and the inner surface of the shielding member 13. The photodetector 12 is disposed in the inner surface 131 of the shield 13 to receive the transmitted light 113 incident through the slit 132 in the shield 13, and detects the energy of the transmitted light 113.

2 is a side elevational view of a highly directional integrated power detecting device including a fiber optic lead and a C lens, in accordance with an embodiment of the present disclosure. Referring to FIG. 2, the high directional integrated power detecting device may further include a fiber lead 21, one end of which is connected to an input 埠 fiber 22 and an output 埠 fiber 23; a columnar C lens 24, C lens 24 The optical fiber lead 21 and the filter 11 are disposed between the optical fiber lead 21 and the filter 11, and have front and rear end faces opposite to the other end of the optical fiber lead 21. The C lens 24 deflects the light input to the x-ray fiber 22 and is reflected by the filter 11 to become reflected light. 112, and entering the output chirped fiber 23 via the C lens 24. According to an embodiment of the present disclosure, the C lens 24 is matched with a filter The combination of 11 can be replaced by a gradient index lens (GRIN Lens) with a tap film. The high directional integrated power detecting device 10 may further include a steel pipe for covering and protecting the filter 11, the photodetector 12, the shielding member 13, the optical fiber lead 21, and the C lens 24.

In FIG. 2, the reflected light 112 reflected by the filter 11 enters the output chirped fiber 23 after passing through the lens 24, and then continues to be transmitted to the subsequent stage; the reflected light is generated due to factors such as the interface difference on the path during subsequent transmission, when the reflection The light return penetrates through the filter 11 according to the penetration ratio, and the reflected light of the penetration filter 11 is as shown by the broken line in FIG. 2, which may cause part of the light to enter the photodetector, thereby reducing the directivity.

The power detecting device of the present disclosure can improve directivity. According to an embodiment of the present disclosure, as shown in FIG. 1, the slit 132 allows the transmitted light 113 to pass through, so that a small hole is formed in the incident light entrance of the shield 13 to filter the energy returned by the reflected light. Can improve directionality. As shown in FIG. 1, the outer surface 133 of the shielding member 13 has a sloped surface and forms an oblique angle with the filter 11, which can change the path of the reflected light after returning to the filter 11 to avoid or reduce reflection. The light returns to the probability and strength of entering the slit 132, so that the directivity can be improved.

3a and 3b illustrate the extent to which an appropriate bevel angle is determined by the path traveled when the reflected light returns, in accordance with an embodiment of the present disclosure. As shown in FIG. 3a, when the oblique angle is larger than θ ₁ , the reflected light returns to the outer surface of the shielding member 13 and does not hit the end surface of the filter 11, so that the inside of the incident filter is multi-reflected and the light is incident again. The possibility of the device 12, further, as shown in Fig. 3b, when the oblique angle is smaller than θ ₂ , the reflected light returns through the filter 11, the shielding member 13, the inner wall of the steel pipe (the upper edge of the shielding member 13), and then reflected to the shielding. The boundary of the lower edge of the member 13 further avoids the possibility of incident on the filter 11 through the reflection of the outer surface 133 of the shield 13 and re-entry into the detector 12. Therefore, the range between θ ₁ and θ ₂ can be selected to determine the appropriate bevel angle.

From the above, as shown in Fig. 3a, θ ₁ must satisfy the following equation D × tan Φ + D × tan (2θ ₁ + Φ) > d / 2 + R / 2, as shown in Fig. 3b, θ ₂ must satisfy r > s+R/2, that is, θ ₂ must satisfy the following equation [W+(W/2-D×tan Φ)]×tan(90-2θ ₂ -Φ)>(D×tan Φ+W/2)×tanθ ₂ +R/2, where D is the distance from the filter to the shield, Φ is the angle between the transmitted light and the horizontal line, d is the vertical height of the filter, W is the vertical height of the shield, and R is the beam diameter. According to an embodiment of the present disclosure, after D=4.5mm, Φ=3.55°, d=1.4mm, W=2.7mm, and R=0.5mm are substituted into the above two equations, θ ₁ ~2.7° and θ are obtained. ₂ ~ 52.2 °, you can choose the range of the bevel angle between 2.7 ° and 52.2 °, for example, you can choose the appropriate bevel angle of 30 °. Therefore, an appropriate bevel can be selected according to the distance from the filter to the shield, the angle between the transmitted light and the horizontal direction, the vertical height of the filter, and the vertical height of the shield to determine the slope of the outer surface of the shield.

In summary, the present disclosure relates to a highly directional integrated power detecting device having a shield. The present disclosure can improve directivity and provide a highly directional integrated power detecting device that is compact in size.

The above is only the embodiment of the disclosure, and the scope of the disclosure is not limited thereto. All changes and modifications made to the scope of the patent application of the present invention are intended to fall within the scope of the invention.

10‧‧‧High directional integrated power detection device

11‧‧‧Filter

111‧‧‧Incoming light

112‧‧‧ Reflected light

113‧‧‧through light

12‧‧‧ Detector

13‧‧‧Shield

131‧‧‧ inner surface

132‧‧‧ slit

133‧‧‧ outer surface

Claims (8)

A high directional integrated power detecting device includes: a filter that receives an incident light and generates a reflected light and a transmitted light; a photodetector that receives the transmitted light and detects the transmitted light And a shielding member having an outer surface, an inner surface, and a slit interposed between the outer surface and the inner surface to cover the photodetector, wherein the photodetector is disposed on the inner surface And the outer surface is a slope, and the slope is determined according to the distance from the filter to the shield, the angle between the transmitted light and the horizontal direction, the vertical height of the filter, and the vertical height of the shield. The power detecting device of claim 1, further comprising a fiber lead, wherein one end is connected to an input 埠 fiber and an output 埠 fiber; and a lens opposite to the other end of the fiber lead, the lens is a column a body having two end faces disposed between the fiber lead and the filter, deflecting light of the input 埠 fiber, and reflecting the light through the filter to become the reflected light, and entering the output through the lens a 埠 fiber; and a steel tube covering the filter, the illuminator, the shield, the fiber lead, and the lens. The power detecting device of claim 2, wherein the lens is a C lens or a graded index lens. The power detecting device of claim 1, wherein the filter is a lens. The power detecting device according to claim 1, wherein the filter has an anti-reflection coating and a high-reflection coating on both sides, and the incident light passes through the anti-reflection coating and the high-reflection coating, respectively. The power detecting device of claim 1, wherein the light detector receives the transmitted light incident through the slit of the shielding member. The power detecting device of claim 1, wherein the slit is a very small hole. The power detecting device of claim 1, wherein the slope increases the path of the reflected light back through the filter to reduce the probability or intensity of the reflected light returning into the slot.