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Device and method for measuring frequency response of optical device

A frequency response, measuring light technology, applied in transmission monitoring/testing/fault measurement systems, etc., can solve problems such as multi-dimensional measurement of optical devices, and achieve the effect of ensuring measurement accuracy and bandwidth, optimizing the conflicting relationship, and ensuring measurement speed.

Inactive Publication Date: 2015-09-30
BEIJING UNIV OF POSTS & TELECOMM
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to solve the defect that the optical device cannot be multi-dimensionally measured in the prior art

Method used

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  • Device and method for measuring frequency response of optical device
  • Device and method for measuring frequency response of optical device
  • Device and method for measuring frequency response of optical device

Examples

Experimental program
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Embodiment 1

[0063] This embodiment provides a device for measuring the frequency response of an optical device. figure 1 Schematic diagram of the structure of the device. The device includes a laser light source 110 , a detection optical path 120 , a reference optical path 130 and a sampling processing module 140 .

[0064] Wherein, the laser light source 110 is used to generate a continuous laser carrier. The detection optical circuit 120 modulates the laser carrier to generate a first optical frequency comb, so that the first optical frequency comb passes through the optical device under test to obtain a detection optical comb, so as to record the amplitude-frequency response and phase-frequency response of the optical device under test in the detection optical comb On the comb teeth of the detection optical path 120, the frequency conversion of the detection optical comb is also converted into a baseband detection signal Sig. The reference optical path 130 modulates the laser carrier...

Embodiment 2

[0076] This example is for figure 1 The individual components of the shown device are described in detail. image 3 is a schematic structural diagram of the device used to measure the frequency response of the optical device in this embodiment. image 3 and figure 1 The same reference numerals are used for the same components.

[0077] It should be noted that since the optical frequency response of the optical device under test is recorded on the comb teeth of the optical frequency comb, it is necessary to calculate the information recorded on each comb tooth in the post-processing process. If the detection bandwidth is increased without increasing the amount of calculation, the interval between comb teeth will inevitably increase, resulting in a decrease in detection accuracy. like image 3 As shown, in this implementation, the PRBS code is used to modulate the continuous laser source to generate an optical frequency comb, so as to flexibly set the detection accuracy and ...

Embodiment 3

[0091] This embodiment provides a method for measuring the frequency response of an optical device. like Figure 5 As shown, firstly a continuous laser carrier is generated (step S501). The laser carrier is modulated to generate a first optical frequency comb (step S502), specifically, the laser carrier is modulated to generate a first optical frequency comb with a first frequency interval. Passing the first optical frequency comb through the optical device under test to obtain a detection optical comb (step S503 ), so as to record the amplitude-frequency response and phase-frequency response of the optical device under test on the teeth of the detection optical comb.

[0092] Modulating the laser carrier to generate a second optical frequency comb (step S504), specifically, shifting the frequency of the laser carrier, and modulating to generate a second optical frequency comb with a second frequency interval, and the first frequency interval It is different from the value o...

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Abstract

The invention provides a device and a method for measuring the frequency response of an optical device. The device comprises a laser source, a detection optical path, a reference optical path and a sampling processing module, wherein the laser optical source is used for generating a continuous laser carrier; the detection optical path is used for modulating the laser carrier to generate a first optical frequency comb, so that the first optical frequency comb obtains a detection optical comb through the optical device to be detected, and thus the amplitude-frequency response and the phase-frequency response of the optical device to be detected are recorded on comb teeth of the detection optical comb, and the detection optical comb is accordingly converted into a baseband detection signal; the reference optical path is used for modulating the laser carrier to generate a second optical frequency comb, so that the second optical frequency comb is converted into a baseband reference signal; the sampling processing module is used for sampling according to the baseband detection signal and the baseband reference signal, and calculating the amplitude-frequency response and the phase-frequency response of the optical device to be detected. According to the device and the method provided by the invention, the measuring speed is ensured while the measuring precision and the bandwidth are ensured, and meanwhile, the amplitude-frequency and phase-frequency responses of the device to be detected can be obtained.

Description

technical field [0001] The invention relates to the technical field of optical device measurement, in particular to a device and method for measuring the frequency response of an optical device. Background technique [0002] In the prior art, it is an inevitable trend of service development to improve the spectrum utilization rate in the optical fiber communication system. Multi-dimensional spectral resources including amplitude, phase, frequency, polarization and even mode field distribution are used to carry information, and the transmission, reception and processing of information have undergone unprecedented changes. For example, the subcarrier bandwidth of the optical frequency division multiplexing (OFDM) system is usually on the order of hundreds of MHz, while a frequency band of the traditional dense wavelength division multiplexing system occupies a bandwidth of hundreds of GHz; 16-order quadrature amplitude modulation (QAM) precisely controls Optical phase to 12 d...

Claims

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Application Information

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IPC IPC(8): H04B10/07
Inventor 戴一堂张梓平徐坤尹飞飞李建强
Owner BEIJING UNIV OF POSTS & TELECOMM
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