TWI672919B - Multiple wavelengths optical power measuring device and method thereof - Google Patents

Abstract

The present invention relates to a multi-wavelength optical power measuring device and method for a multi-wavelength optical fiber network, which is applied to a difference in optical bending loss of light of different wavelengths, and a difference in optical loss characteristics of different fiber bending radii by the same wavelength. And optical power detection principle to measure the optical power value of each wavelength in the optical fiber of multi-wavelength light.

Description

Multi-wavelength optical power measuring device and method

The present invention relates to an optical power measurement technique for each wavelength in a multi-wavelength optical fiber, which uses different wavelengths of light to pass different fiber bending losses through the same bending radius fiber, and the same wavelength light passes through different bending radius fibers having different optical fibers. A multi-wavelength optical power measuring device and method for testing the optical power of each wavelength in multi-wavelength light by bending loss and optical power measurement principle.

At present, all optical power tests for transmitting wavelengths simultaneously in an optical fiber use optical filtering techniques, wherein the prior art utilizes a method of using an optical filtering component that allows only the wavelength to be measured to pass, and then a photo sensing component. Light passing through the optical filter element is received to test the optical power of the wavelength of the light. Each wavelength of light must use a particular optical filtering component that is appropriate for that wavelength. The main disadvantage of this technique is the use of high cost optical filtering components, and it can only provide tests for the optical power at a specific wavelength set, and cannot be tested if the wavelength is not within the predetermined test range.

It can be seen that there are still many shortcomings in the above-mentioned methods of use, which is not a good design, but needs to be improved.

The object of the present invention is to provide a measuring device and method for measuring the optical power of each wavelength in multi-wavelength light, which can be applied to measure the transmission power of each transmission wavelength of a multi-wavelength optical fiber communication system to detect its transmission quality and obstacle judgment.

To achieve the above object, the multi-wavelength optical power measuring device of the present invention comprises: an optical splitter having a plurality of divergent chirps for splitting the received multi-wavelength light to form a divergent multi-wavelength Light is output through the plurality of different enthalpies; a plurality of bending loss fibers respectively connected to the plurality of branching ridges, each of the plurality of bending loss fibers having a predetermined fiber bending loss value for entering the plurality of bending loss fibers The different multi-wavelength light generates light loss; a plurality of optical power devices respectively connected to the plurality of bending loss fibers for measuring a sum of photocurrents of the divergent multi-wavelength light from the plurality of bending loss fibers, thereby obtaining the Dividing optical power of each wavelength in the multi-wavelength light; processing unit connecting the plurality of optical power devices, the processing unit receiving optical power of the respective wavelengths from the plurality of optical power devices to be pre-stored according to the optical splitter The optical power values of the plurality of bending loss fibers and the response coefficients of the respective wavelengths are used to calculate optical power values of the respective wavelengths.

The multi-wavelength optical power measuring device as described above, wherein the response coefficient of each wavelength is R=I/P, and wherein R is a response coefficient, and I is a photocurrent generated by a photodiode receiving wavelength, and P is the optical power of the photodiode receiving wavelength.

The multi-wavelength optical power measuring device as described above, wherein each of the plurality of bending loss fibers has different fiber bending loss values to make each of the plurality of bends The curved loss fiber produces different optical losses for different wavelengths of light output by the same divergence, and causes each of the plurality of bending loss fibers to produce different optical losses for different wavelengths of light output by the different divergence.

The multi-wavelength optical power measuring device as described above, wherein each of the plurality of bending loss fibers has different bending radii, thereby achieving different bending losses at the same wavelength.

A multi-wavelength optical power measuring device as described above, wherein the plurality of bending loss fibers comprise a zero-light loss fiber having a bending loss of zero.

The multi-wavelength optical power measuring device as described above, wherein the processing unit, when calculating the optical power value of the respective wavelengths, further refers to the optical splitter and the plurality of bending loss fibers and the plurality of bending loss fibers The optical loss value of the fiber between the optical splitters is calculated.

The present invention further provides a multi-wavelength optical power measurement method, comprising: splitting the multi-wavelength light received by the optical splitter to form a divergent multi-wavelength light; and causing the divergent multi-wavelength light to enter the plurality of bend-loss optical fibers respectively, Generating light loss to the divergent multi-wavelength light entering the plurality of bend loss fibers, wherein each of the plurality of bend loss fibers has a predetermined fiber bend loss value; causing the plurality of optical power devices to receive and measure from the plurality of bends Loss the sum of the photocurrents of the divergent multi-wavelength light of the optical fiber to obtain the optical power of each wavelength in the divergent multi-wavelength light; and cause the processing unit to transmit the optical power of the respective wavelengths from the plurality of optical power devices according to the pre-existing The optical splitter, the optical loss values of the plurality of bending loss fibers, and the response coefficients of the respective wavelengths are used to calculate optical power values of the respective wavelengths.

a multi-wavelength optical power measurement method as described above, wherein the wavelengths are The response coefficient is R=I/P, and R is a response coefficient, and wherein I is a photocurrent generated by a photodiode receiving wavelength, and P is an optical power of a photodiode receiving wavelength.

The multi-wavelength optical power measurement method as described above, wherein each of the plurality of bending loss fibers has different fiber bending loss values, so that each of the plurality of bending loss fibers generates light of different wavelengths output by the same one. Different light losses, and causing each of the plurality of bend loss fibers to produce different optical losses for different wavelengths of light output by the different ones.

The multi-wavelength optical power measurement method as described above, wherein each of the plurality of bending loss fibers has different bending radii, thereby achieving different bending losses at the same wavelength.

The multi-wavelength optical power measurement method as described above, wherein the plurality of bending loss fibers comprise a zero-light loss fiber having a bending loss of zero.

The multi-wavelength optical power measuring method device as described above, wherein, in the step of calculating the optical power value of each wavelength, the method further comprises: referring to the optical splitter and the plurality of bending loss fibers and the plurality of bending loss fibers The optical loss value of the optical fiber between the plurality of optical power units is calculated.

In summary, the present invention proposes a multi-wavelength optical power measuring device and method for a multi-wavelength optical fiber network, which is applied to a difference in bending loss of optical fibers of different wavelengths, and different optical fibers by the same wavelength. The optical loss difference characteristic of the bending radius and the optical power detection principle are used to measure the optical power values of the respective wavelengths in the optical fiber of the multi-wavelength light, and accordingly, it is not necessary to use a high-cost optical filter component or only test the setting as in the prior art. Optical power at a specific wavelength.

10‧‧‧Light splitter

11~15‧‧‧Differs埠

16‧‧‧Community

20‧‧‧Multi-wavelength light

21~25‧‧‧Multi-wavelength light

30‧‧‧Fiber

31~35‧‧‧ fiber

41~45‧‧‧Bending loss fiber

51~55‧‧‧Multi-wavelength light

61~65‧‧‧ fiber

71~75‧‧‧Optical power input 埠

81~85‧‧‧Optical power unit

91~95‧‧‧Light path interval

100‧‧‧Processing unit

The detailed description of the present invention and the accompanying drawings will be further understood, and the technical contents of the present invention and the functions thereof can be further understood. The related drawings are: FIG. 1 is the basis of the multi-wavelength optical power measuring device and method of the present invention. FIG. 2 is a schematic diagram of implementation of a multi-wavelength optical power measuring device and method according to the present invention; and FIG. 3 is a multi-wavelength optical power measuring device and method according to the present invention. According to the light sensor response coefficient and wavelength relationship diagram.

The invention is based on the disadvantages of using the high-cost optical filter component and the optical power of only a specific wavelength derived from the conventional methods, and is improved according to the bending loss characteristic of the optical fiber and the optical power test working principle of the optical fiber, so as to be usable. A multi-wavelength optical power measuring apparatus and method for testing optical power of respective wavelengths of multi-wavelength light in an optical fiber.

Please refer to FIG. 1 and FIG. 2 , which are schematic diagrams showing an implementation structure of a multi-wavelength optical power measuring device and method according to the present invention, which comprises: 1×n optical splitter 10 and a plurality of different bending loss optical fibers 41-45. The optical power units 81 to 85 and the processing unit 100.

The specific embodiment includes: multi-wavelength light 20 containing n kinds of wavelengths enters the optical splitter 10, and is input to the common 埠16 of the optical splitter 10 via the optical fiber 30, and the optical splitter 10 splits the multi-wavelength light 20 to the optical splitter 10 Each of the differences 埠11~15, the divergent multi-wavelength light 21~25 outputted by each of the different 埠11~15 inputs a specific bending loss fiber with different bending radii via the optical fiber 31~35 41~45, wherein one of them may be a non-bending fiber, and the divergent multi-wavelength light 51~55 of the optical loss of the optical fiber 41~45 outputted by the specific bending loss of the different bending radius is connected to the optical power input through the optical fiber 61~65埠71~75, measuring the optical power of each of the different multi-wavelength lights 51~55 by connecting to the optical power devices 81-85, and the processing unit 100 extracts the optical power of the different multi-wavelength lights 51~55 by the optical power devices 81-85. Value, the optical power value of each wavelength is calculated according to the following test techniques and principles.

The optical power meter used in general fiber communication is tested by a photodiode that receives incident light and measures the current generated by its photoelectric effect. Since this current is proportional to the optical power of the input light, the ratio is called For the response coefficient (Responsivity), however, the photoelectric effect efficiency of different wavelengths is different, and therefore, the response coefficients of different wavelengths are also different. Fig. 3 is a graph showing the relative response coefficient and wavelength of a gallium indium arsenide (InGaAs) photosensor for typical optical communication. The response coefficient of a certain wavelength can be expressed by the following formula (1): R = I / P ( 1); wherein, I: photodiode receives photocurrent generated by wavelength k (Photocurrent); P: photodiode receives optical power of wavelength k; and R: response coefficient (Responsivity).

The multi-wavelength light 20 includes wavelengths of wavelength 1, wavelength 2, wavelength 3, ..., wavelength n, and the optical powers of the respective wavelengths are P01, P02, P03, ..., P0n are the optical powers of the respective wavelengths to be tested.

Since the optical power devices 81 to 85 measure the photocurrent as the total of the photocurrents of the respective wavelengths And, a plurality of wavelengths of light 51 to 55 are respectively input to the optical power devices 81 to 85. If the optical power test wavelength is set to a certain wavelength, the response coefficient is R, and the measured optical power value can be expressed by the following formula (2) Or according to the formula (1) expressed by the following formula (3): Pr = (Ir1 + Ir2 + ... + Irq + ... + Irn) / R (2); Pr = (R1 × Pr1 + R2 × Pr2+...+Rq×Prq+...+Rn×Prn)/R(3); wherein n: the multi-wavelength light 20 contains the number of wavelengths; Pr: the light measured by the rth optical power device 81-85 Power, 1≦r≦n; Irq: the photocurrent generated by the rth optical power unit 81~85 receiving the wavelength q, 1≦q≦n, 1≦r≦n; R: the response of the optical power generator setting test wavelength Coefficient; Rq: Response coefficient of wavelength q, 1≦q≦n; Prq: The optical power of the rth optical power unit 81~85 receiving the wavelength q, 1≦q≦n, 1≦r≦n.

The light of any one of the multi-wavelength light 20 is input from the common 埠16 of the optical splitter 10 through the optical splitter 10, the optical fibers 31-35, the different bending loss optical fibers 41-45, and the input from the 1×n optical splitter to the front The optical path sections 91 to 95 of the optical loss such as the optical fiber connection points between the optical power input ports enter the optical power units 81 to 85, and the relationship between the wavelengths before and after the attenuation of the optical loss is expressed by the following formula (4): Prq = Lrq × P0q (4); wherein, Lrq: wavelength q passes through the rth attenuation optical path interval 91~95 light loss, 1≦q≦n, 1≦r≦n; P0q: optical power of the wavelength q in the multi-wavelength light 20, 1 ≦ q ≦ n.

According to the content of formula (4), formula (3) can be expressed as the following formula (5): Pr = (R1 × Lr1 × P01 + R2 × Lr2 × P02 + ... + Rq × Lrq × P0q +... +Rn×Lrn×P0n)/R (5).

Since the optical loss of the optical splitter, the optical fiber, the optical fiber bending, and the response coefficient of each wavelength are constant, the optical loss and the response coefficient can be integrated into the following formula (6): Arq=Rq×Lrq/R ( 6); wherein, Arq: the optical loss of the wavelength q through the r-th attenuation path section 91-95 is multiplied by the ratio of the response coefficient of the wavelength q to the optical power generator set test wavelength.

According to this, Equation (6) can be used to simplify the above formula (5) into the following formula (7): Pr = Ar1 × P01 + Ar2 × P02 + ... + Arq × P0q + ... + Arn × P0n (7) ).

Alternatively, the optical power received by each of the optical power units 81 to 85 can be more completely listed, as in the following formulas (8-1), (8-2), ..., (8-n): P1 = A11 × P01+A12×P02+...+A1q×P0q+...+A1n×P0n (8-1); P2=A21×P01+A22×P02+...+A2q×P0q+...+A2n×P0n (8 -2);....

Pn=An1×P01+An2×P02+...+Anq×P0q+...+Ann×P0n (8-n); It is an n-ary primary simultaneous equation, whereby the processing unit 100 draws the optical power devices 81-85 to test the optical power values of the divergent multi-wavelength light, and the optical loss values of the stored optical splitter, optical fiber, optical fiber bending, and the like. The wavelength response coefficient is used to calculate the optical power value of each wavelength.

The bending loss fibers 41-45 have different bending radii, so as to achieve different bending losses at the same wavelength; since the bending loss fibers have different fiber bending loss values, different light wavelengths are generated for the same one. Light loss, and different light loss for different wavelengths of light output by different ones; wherein when the bending radius of the bending loss fibers 41 to 45 is greater than a specific value, the bending loss will be zero, and the bending loss fiber 41~45 It also includes an unbent fiber with a bending radius of zero and a zero light loss approaching infinity.

The multi-wavelength optical power measuring device and method provided by the present invention have the following advantages when compared with other conventional technologies: (1) The present invention uses optical divergence, optical fibers, different bending loss optical fibers, and optical power devices to measure Contains optical power of multiple wavelengths of light. The components used are mature and mass-produced products, in which high-cost optical filter components are replaced by different bending loss fibers with almost no cost, thus providing a viable and economical multi-wavelength optical power measuring device, which can be applied to many Communication quality and obstacle detection tools for wavelengths of wavelength fiber communication; (2) The present invention uses optical divergence, optical fibers, and different bending loss optical fibers, as long as light of any wavelength through these components can be set by changing the test wavelength. , the optical power test of this wavelength can be performed. Other conventional techniques using optical filter components cannot test the optical power of the wavelength without providing a certain wavelength filter component.

The detailed description of the present invention is intended to be illustrative of a preferred embodiment of the invention, and is not intended to limit the scope of the invention. The patent scope of this case.

Claims (12)

A multi-wavelength optical power measuring device comprising: an optical splitter having a plurality of divergence chirps for splitting the received multi-wavelength light to form divergent multi-wavelength light via the plurality of divergences a plurality of bending loss fibers respectively connected to the plurality of different bending turns, each of the plurality of bending loss fibers respectively having a predetermined fiber bending loss value for generating the divergent multi-wavelength light entering the plurality of bending loss fibers Light loss; a plurality of optical power devices respectively connected to the plurality of bending loss fibers for measuring a sum of photocurrents of the divergent multi-wavelength light from the plurality of bending loss fibers, thereby obtaining respective wavelengths of the divergent multi-wavelength light And a processing unit coupled to the plurality of optical power units, the processing unit receiving optical powers of the respective wavelengths from the plurality of optical power devices to receive the plurality of bending losses according to the pre-stored optical splitter The optical power values of the respective wavelengths are calculated from the optical loss values of the optical fibers and the response coefficients of the respective wavelengths. The multi-wavelength optical power measuring device according to claim 1, wherein the response coefficient of each wavelength is R=I/P, and wherein R is a response coefficient, and I is a photodiode receiving wavelength. The photocurrent generated, and P is the optical power of the photodiode receiving wavelength. The multi-wavelength optical power measuring device according to claim 1, wherein each of the plurality of bending loss fibers has different fiber bending loss a value such that each of the plurality of bending loss fibers produces different optical losses for different wavelengths of light output by the same one of the plurality of different divergences, and the plurality of bending loss fibers are for the plurality of divergence fibers The same wavelength of light output by different divergence 产生 produces different light losses. The multi-wavelength optical power measuring device of claim 1, wherein each of the plurality of bending loss fibers has different bending radii, thereby achieving different bending losses at the same wavelength. The multi-wavelength optical power measuring device of claim 4, wherein the plurality of bending loss fibers comprise a zero-light loss fiber having a bending loss of zero. The multi-wavelength optical power measuring device according to claim 1, wherein the processing unit further refers to the optical splitter and the plurality of bending loss fibers between the optical splitter and the optical power value of the respective wavelengths; The optical loss values of the plurality of bending loss fibers and the optical fibers between the plurality of optical power units are calculated. A multi-wavelength optical power measurement method, comprising: splitting a multi-wavelength light received by an optical splitter to form a divergent multi-wavelength light and outputting through a plurality of divergent chirps; causing the divergent multi-wavelength light to enter a plurality of bending losses respectively An optical fiber for generating optical loss for the divergent multi-wavelength light entering the plurality of bending loss fibers, wherein each of the plurality of bending loss fibers respectively has a predetermined fiber bending loss value; and the plurality of optical power devices receive and measure from the optical fiber The sum of the photocurrents of the divergent multi-wavelength light of the plurality of bend-loss fibers to obtain the divergence The optical power of each wavelength in the wavelength light; and the optical power of the wavelengths from the plurality of optical power units by the processing unit, according to the pre-stored optical splitter, the optical loss values of the plurality of bending loss fibers, and the respective The response coefficient of the wavelength is used to calculate the optical power value of the respective wavelengths. The multi-wavelength optical power measurement method according to claim 7, wherein the response coefficient of each wavelength is R=I/P, and wherein R is a response coefficient, and I is a photodiode receiving wavelength. The photocurrent generated, and P is the optical power of the photodiode receiving wavelength. The multi-wavelength optical power measurement method of claim 7, wherein each of the plurality of bending loss fibers has different fiber bending loss values, so that the plurality of bending loss fibers are different for the plurality of bending loss fibers. Different wavelengths of light output by the same divergence 产生 produce different light losses, and each of the plurality of bending loss fibers produces different optical losses for the same wavelength of light outputted by different ones of the plurality of different 埠. The multi-wavelength optical power measurement method of claim 7, wherein each of the plurality of bending loss fibers has different bending radii, thereby achieving different bending losses at the same wavelength. The multi-wavelength optical power measurement method of claim 10, wherein the plurality of bending loss fibers comprise a zero-light loss fiber having a bending loss of zero. The multi-wavelength optical power measuring method device according to claim 7, wherein in the step of calculating the optical power value of each wavelength, the method further comprises: referring to the optical splitter and the plurality of bending loss fibers, and The The optical loss values of the plurality of bending loss fibers and the optical fibers between the plurality of optical power units are calculated.