CN-122003588-A - Test device, test method, and computer program product

CN122003588ACN 122003588 ACN122003588 ACN 122003588ACN-122003588-A

Abstract

The invention provides a test device for detecting optical power of each wavelength of input light including n (n is a natural number) different wavelengths emitted from a tested element, the test device comprises a propagation part capable of switching n or more propagation wavelength characteristics different from each other for the input light and propagating the input light including n wavelengths from the tested element according to the n propagation wavelength characteristics, an optical power detection part for detecting optical power of the n propagation light propagating according to the n propagation wavelength characteristics from the propagation part, and an optical power calculation part for calculating optical power of the n propagation light detected from the optical power detection part based on the n propagation wavelength characteristics.

Inventors

Ri Xiachong

Assignees

爱德万测试株式会社

Dates

Publication Date: 20260508
Application Date: 20241017
Priority Date: 20231024

Claims (14)

1. A test apparatus for detecting optical power of each wavelength of input light including n (n is a natural number) different wavelengths emitted from a test element, the test apparatus comprising: A propagation unit configured to be capable of switching n or more propagation wavelength characteristics different from each other for the input light, and propagating the input light having the n wavelengths from the device under test with the n propagation wavelength characteristics; An optical power detection unit configured to detect optical powers of n propagation lights propagated from the propagation unit in the n propagation wavelength characteristics, and An optical power calculation unit that calculates the optical powers of the n wavelengths included in the input light based on the n propagation wavelength characteristics from the optical powers of the n propagation lights detected by the optical power detection unit.
2. The test device according to claim 1, wherein, At least one of the n propagation wavelength characteristics is a characteristic of propagating propagation light including at least two wavelengths of the n wavelengths.
3. The test device according to claim 1, wherein, The optical power calculation unit reversely calculates the optical powers of the n wavelengths from the optical powers of the n propagating lights based on the n propagating wavelength characteristics.
4. The test device according to claim 1, wherein, The optical power calculation unit calculates the n-wavelength individual optical powers reversely from the n-wavelength individual optical powers based on the n-propagation wavelength characteristics, which are distinguished in advance using the n-wavelength individual reference input light whose optical powers are known.
5. The test device according to claim 4, wherein, The n propagation wavelength characteristics include n propagation wavelength characteristic members for each of the n wavelengths, thereby having a total of n×n propagation wavelength characteristic members; The optical power calculation unit calculates the n×n propagation wavelength characteristics by calculating the n×n propagation wavelength characteristic members based on the known optical power of each of the n-wavelength individual reference input lights and the optical power of the n×n reference propagation lights detected by the optical power detection unit, wherein the optical power of the n×n reference propagation lights is the optical power of the n×n reference propagation lights propagated in the n propagation wavelength characteristics for the n wavelengths from the propagation unit to which the n-wavelength individual reference input lights are input.
6. The test device according to claim 4, wherein, The n reference input light wavelengths include wavelengths other than the n wavelengths included in the input light, and the n reference input light wavelength bands at least partially overlap the n wavelength band regions included in the input light; The n propagation wavelength characteristics include n propagation wavelength characteristic members for each of the n wavelengths, thereby having a total of n×n propagation wavelength characteristic members; The optical power calculation unit calculates the n×n propagation wavelength characteristic members based on the known optical power of each of the n-wavelength individual reference input lights and the optical power of the n×n reference propagation lights detected by the optical power detection unit, and interpolates the n×n propagation wavelength characteristic members corresponding to the n wavelengths included in the input lights by using the n×n propagation wavelength characteristic members thus calculated, thereby calculating the n propagation wavelength characteristics in advance, wherein the optical power of the n×n reference propagation lights is the optical power of the n×n reference propagation lights propagated in the n propagation wavelength characteristics for the n wavelengths individually from the propagation unit to which the n-wavelength individual reference input lights are input.
7. The test device according to claim 1, wherein, The optical power calculation unit reversely calculates the n-wavelength individual optical powers from the n-wavelength individual optical powers based on the n-propagation wavelength characteristics, which are distinguished in advance using the m (m+.n) -wavelength individual reference input light for which the respective optical powers are known; The m wavelengths include wavelengths other than the n wavelengths, and the wavelength bands of the m wavelengths at least partially overlap the wavelength bands of the n wavelengths.
8. The test device according to claim 7, wherein, The n propagation wavelength characteristics include n propagation wavelength characteristic members for each of the n wavelengths, thereby having a total of n×n propagation wavelength characteristic members; The optical power calculation unit calculates the m×n propagation wavelength characteristic members based on the known optical power of each of the m-wavelength individual reference input lights and the optical power of the m×n reference propagation lights detected by the optical power detection unit, and interpolates the n×n propagation wavelength characteristic members corresponding to the n wavelengths included in the input light by using the calculated m×n propagation wavelength characteristic members, thereby calculating in advance the n propagation wavelength characteristics, wherein the optical power of the m×n reference propagation lights is the optical power of the m×n reference propagation lights propagated in the n propagation wavelength characteristics for the m wavelengths from the propagation unit to which the m-wavelength individual reference input lights are input.
9. The test device according to claim 1, wherein, The n propagation wavelength characteristics are characteristics in which only optical powers of one or more different wavelengths among the n wavelengths are maintained or amplified, and optical powers of the remaining wavelengths are attenuated.
10. The test device according to claim 1, wherein, The n propagation wavelength characteristics are characteristics in which only optical powers of a plurality of different wavelengths among the n wavelengths are maintained and optical powers of the remaining wavelengths are set to 0, or characteristics in which only optical powers of a different wavelength among the n wavelengths are set to 0 and optical powers of the remaining wavelengths are maintained.
11. The test device according to claim 1, wherein, The propagation unit can switch the n or more propagation wavelength characteristics by controlling at least any one of temperature, voltage, current, charge, magnetic flux, and pressure applied to a material having variable optical characteristics, changing the physical dimensions of the optical path of the propagation light using at least any one of a servo motor, a piezoelectric element, and a bimetal, or switching n or more propagation devices that propagate light with different propagation wavelength characteristics from each other.
12. The test device of claim 1, further comprising: And a determination unit configured to determine whether or not the device under test is good based on the optical powers of the n wavelengths calculated by the optical power calculation unit.
13. A test method for detecting optical power of each wavelength of input light including n (n is a natural number) different wavelengths from an element to be tested, the test method comprising the steps of: The propagation unit capable of switching n or more propagation wavelength characteristics different from each other with respect to the input light propagates the input light having the n wavelengths from the device under test with the n propagation wavelength characteristics; detecting optical powers of n propagation lights propagated from the propagation portion with the n propagation wavelength characteristics, and From the detected optical powers of the n propagating lights, the optical powers of the n wavelengths contained in the input light are calculated based on the n propagating wavelength characteristics.
14. A computer program product comprising computer instructions recorded in a non-transitory computer readable medium, the computer instructions being executable by a computer of a test device to cause the test device to detect optical power of each wavelength of input light emitted from a tested element comprising n (n is a natural number) wavelengths different from each other, to perform the steps of: The propagation unit capable of switching n or more propagation wavelength characteristics different from each other with respect to the input light propagates the input light having the n wavelengths from the device under test with the n propagation wavelength characteristics; detecting optical powers of n propagation lights propagated from the propagation portion with the n propagation wavelength characteristics, and From the detected optical powers of the n propagating lights, the optical powers of the n wavelengths contained in the input light are calculated based on the n propagating wavelength characteristics.

Description

Test device, test method, and computer program product Technical Field The invention relates to a test device, a test method and a computer program product. Background Patent document 1 describes that "according to a wavelength division multiplexing (WAVELENGTH DIVISION MULTIPLEXING, WDM) optical amplifier, by providing gain equalization means having variable loss wavelength characteristics and controlling the variable loss wavelength characteristics in response to a change in input optical power, gain wavelength characteristics of the optical amplification means that are changed in response to the input optical power can be positively compensated, so that output light having flat wavelength characteristics can be obtained. "(paragraph 0105). In the mechanical translation of patent document 2, it is described that "when the data analysis module (109) corrects a flat natural emission spectrum, the power variation of the input and output amplified spontaneous emission (AMPLIFIED SPONTANEOUS EMISSION, ASE) at the sampling point can be combined to perform correction and correction in consideration of a rapid change in the spectrum shape of the signal sampled at a short wavelength. "(paragraph 0061). Prior art literature Patent literature Patent document 1 Japanese patent laid-open No. 2000-252923 Patent document 2CN 105281827A Disclosure of Invention In a first embodiment of the present invention, a test apparatus is provided for detecting optical power of each wavelength of input light including n (n is a natural number) different wavelengths emitted from a device under test. The test device includes a propagation unit configured to switch n or more propagation wavelength characteristics different from each other for the input light, and propagate the input light having the n wavelengths from the device under test in the n propagation wavelength characteristics, an optical power detection unit configured to detect optical powers of the n propagation lights propagated in the n propagation wavelength characteristics from the propagation unit, and an optical power calculation unit configured to calculate the optical powers of the n propagation lights contained in the input light based on the n propagation wavelength characteristics. In the test device, at least one of the n propagation wavelength characteristics may be a characteristic of propagating propagation light including at least two wavelengths among the n wavelengths. In the above-described test apparatus, the optical power calculation unit may calculate the optical powers of the n wavelengths from the optical powers of the n propagating lights in a reverse direction based on the n propagating wavelength characteristics. In the above-described test apparatus, the optical power calculation unit may calculate the n-wavelength individual optical powers reversely from the optical powers of the n-wavelength individual optical power based on the n-wavelength propagation characteristics that are distinguished in advance using the n-wavelength individual reference input light for which the respective optical powers are known. In the above-described test apparatus, the n propagation wavelength characteristics may include n propagation wavelength characteristic members for each of the n wavelengths, and may include a total of n×n propagation wavelength characteristic members. In the above-described test apparatus, the optical power calculation unit may calculate the n propagation wavelength characteristics in advance based on the known optical power of each of the n-wavelength individual reference input lights and the optical power of the n×n reference propagation lights detected by the optical power detection unit, wherein the optical power of the n×n reference propagation lights is the optical power of the n×n reference propagation lights propagated in the n propagation wavelength characteristics for each of the n wavelengths from the propagation unit to which the n-wavelength individual reference input lights are input. In the above-described test device, the n reference input light may have wavelengths other than the n wavelengths included in the input light, and the n reference input light may have wavelength ranges at least partially overlapping the n wavelength ranges included in the input light. In the above-described test apparatus, the n propagation wavelength characteristics may include n propagation wavelength characteristic members for each of the n wavelengths, and may include a total of n×n propagation wavelength characteristic members. In the above-described test apparatus, the optical power calculation unit may calculate the n×n propagation wavelength characteristic members based on the known optical power of each of the n-wavelength individual reference input lights and the optical power of the n×n reference propagation lights detected by the optical power detection unit, and interpolate the n×n propagation wavelength characteristic members corre