TWM466432U - Testing apparatus for optical network unit - Google Patents

Abstract

A testing apparatus for an optical network unit is disclosed to detect the communication quality of the optical network unit. The testing apparatus includes a light transceiver module and a control unit. The transmitting wavelength of the light transceiver module is &lgr; 1, and the receiving wavelength of the light transceiver module is &lgr; 2. The light transceiver module is connected to the control unit to receive an electrical signal from the control unit, so that a pulsed light of wavelength &lgr; 1 is generated by the light transceiver module to be a testing light. After the pulsed light of wavelength &lgr; 1 is received by the optical network unit, the optical network unit output a pulsed light of wavelength &lgr; 2.

Description

Fiber optic network unit test equipment

This creation is about a test device and test method, and in particular, a self-made test device and test method for detecting the optical communication quality of an optical network unit (ONU).

In recent years, the establishment of physical networks has gradually moved toward optical communication networks with large transmission capacity and good confidentiality. Especially in the case of long distance and large-scale transmission, the quality of optical fiber communication is far superior to the quality of traditional cable communication, to achieve fiber-to-the-home (FTTH) services, and the common passive optical network (Passive Optical Network, PON) ) for mainstream technology. Please refer to FIG. 1 , which illustrates a system architecture diagram of a conventional passive optical network. An optical line terminal (OLT) is disposed in the central office equipment and is externally connected to the optical network backbone 40. The optical signal transmitted by the optical line terminal 10 can be transmitted through the optical fiber, and the optical signal is branched and transmitted to the optical network unit 30 (ONU) near each terminal user via a splitter 20. The optical signals transmitted by the optical fiber network units 30 are coupled via the splitter 20 and transmitted to the optical fiber line terminal 10.

With the popularity of fiber-optic networks, the communication quality of fiber-optic networks must be more Stabilize to reduce the incidence of failures. Therefore, the testing of the fiber optic network unit 30 is the focus of the factory quality testing, and the testing equipment used today is to purchase expensive instruments, such as the external purchase bit error rate tester (BERT), Providing accurate pulse signals, however, the disadvantage is that if the instrument itself cannot be repaired by itself, it must be repaired by the original factory and the self-made rate cannot be improved. In view of this, it is a constant trend to develop test equipment that meets the requirements for fiber-optic network communication testing.

This creation is about a test equipment and test method for a fiber-optic network unit, replacing the existing test equipment with a self-made test equipment.

According to one aspect of the present invention, a test device for a fiber optic network unit is provided for detecting optical communication quality of a fiber optic network unit. The test device of the fiber network unit includes an optical transceiver module and a control unit. The optical transceiver module has an emission wavelength of λ 1 and a reception wavelength of λ 2 . The control unit is connected to the optical transceiver module, and the optical transceiver module is configured to receive the electrical signal sent by the control unit, so that the optical transceiver module generates a pulse light source with a wavelength of λ 1 as a pulse source for detecting, and the optical fiber After receiving the pulsed light source of wavelength λ 1 , the network unit outputs a pulsed light source having a wavelength of λ 2 .

According to one aspect of the present invention, a method for testing a fiber optic network unit is proposed to detect the optical communication quality of a fiber optic network unit. The test method of the fiber optic network unit includes the following steps. An optical transceiver module is provided. The optical transceiver module has an emission wavelength of λ 1 and a reception wavelength of λ 2 . Connect a control unit to receive control The electrical signal sent by the unit is such that the optical transceiver module generates a pulse light source having a wavelength of λ 1 as a pulse light source for detection. After receiving the pulse source of wavelength λ 1 , the fiber optic network unit outputs a pulse source having a wavelength of λ 2 .

In order to better understand the above and other aspects of the present invention, the preferred embodiments are described below, and in conjunction with the drawings, the detailed description is as follows:

10‧‧‧Fiber line terminal

20‧‧‧Differentiator

30‧‧‧Fiber network unit

40‧‧‧Fiber network backbone

100‧‧‧Test equipment

110‧‧‧Fiber network equipment

112‧‧‧Optical transceiver module

114‧‧‧Control unit

116‧‧‧Differentiator

118‧‧‧ oscilloscope

120‧‧‧Fiber network unit

122‧‧‧Light emitting elements

124‧‧‧Light receiving components

Rx‧‧‧pulse source with wavelength λ 1

Tx‧‧‧pulse source with wavelength λ 2

Figure 1 is a diagram showing the system architecture of a conventional passive optical network.

2 is a schematic diagram of a test apparatus of a fiber optic network unit in accordance with an embodiment of the present invention.

FIG. 3 is a flow chart showing a test method of a fiber optic network unit according to an embodiment of the present invention.

The testing device and the testing method of the optical fiber network unit disclosed in this embodiment are modified by self-produced optical fiber network equipment and adjusted parameters to enable a specific wavelength of the pulse light source to be used as the detecting optical fiber network unit. (ONU) a pulse source. For example, an optical transceiver module having an emission wavelength of 1310 nm and a reception wavelength of 1490 nm is modified into an optical transceiver module having an emission wavelength of 1490 nm and a reception wavelength of 1310 nm. That is to say, the emission wavelength of the modified optical transceiver module is 1490 nm, which can be used as the wavelength of a pulse source for detecting the fiber network unit. Therefore, the present embodiment can be used as a self-made test equipment after the modification of the existing optical network equipment, and can replace the traditional bit error rate tester that is purchased externally, and the cost is low, and the use is low. It's easier.

The following is a detailed description of the embodiments, which are intended to be illustrative only and not to limit the scope of the invention.

First embodiment

Referring to FIG. 2, a schematic diagram of a test apparatus 100 for a fiber optic network unit in accordance with an embodiment of the present invention is shown. The test equipment 100 self-made by the self-produced fiber optic network device 110 includes an optical transceiver module 112 and a control unit 114. The optical transceiver module 112 is configured to receive the electrical signal sent by the control unit 114, so that the optical transceiver module 112 generates a pulse light source Rx having a wavelength of λ1, and the pulse light source Rx having the wavelength λ1 is output through the optical transceiver module 112. As a pulse source for detection.

The control unit 114 is, for example, a central processing unit, a frequency synthesizer or the like. The frequency synthesizer is mainly composed of a voltage controlled oscillator (VCO) and a phase locked loop (PLL) to determine the output frequency of the voltage controlled oscillator. Once the loop is locked, the output signal of the voltage controlled oscillator can be locked to a specific frequency, such as locked at 1.25 GHz or 2.5 GHz, as a pulse signal.

The optical transceiver module 112 has a photoelectric converter, such as a laser diode, for receiving an electrical signal from the control unit 114 and converting it into a pulse light source Rx having a wavelength of λ 1, for example, converting to a frequency of 2.5 GHz, a wavelength. It is a pulse source of 1490 nm.

In addition, in FIG. 2, the test apparatus 100 includes a splitter 116 connected between the optical transceiver module 112 and the optical fiber network unit 120 to be tested, and transmits a pulse light source having a wavelength of λ 1 and a wavelength of Pulse light source Tx of λ 2 .

In addition, in FIG. 2, the test apparatus 100 includes an oscilloscope. 118. Connect the diver 116 to receive the pulse light source Tx having a wavelength of λ 2 . That is, the fiber optic network unit 120 to be tested outputs a pulsed light source Tx having a wavelength of λ 2 and is transmitted to the oscilloscope 118 via the splitter 116. The oscilloscope 118 can display an eye diagram of the pulse signal. When the voltage error of the pulse signal increases, the blank space in the center of the eye diagram will shrink, and when the pulse signal produces a time error as the noise increases, the signal will produce a blurred strip line with jitter or drift. Therefore, we can know the quality of optical communication by observing the eye width, eye height, and degree of edge jitter of the eye.

Referring to FIG. 2, the fiber optic network unit 120 to be tested includes a light emitting element 122 and a light receiving element 124 for output. The pulse light source Tx having a wavelength of λ 2 and the light receiving element 124 are for receiving the pulse light source Rx having a wavelength of λ 1 .

In the present embodiment, the test equipment 100 is modified by a fiber optic network device 110 and adjusts the parameters of the control unit 114 such that the optical network device 110 has an emission wavelength of λ 2 and a reception wavelength of λ 1 . The transceiver module is modified into an optical transceiver module 112 having an emission wavelength of λ 1 and a reception wavelength of λ 2 .

For example, the fiber optic network device 110 is, for example, a shutter device that is produced with an optical transceiver module having an emission wavelength of λ 2 and a reception wavelength of λ 1 . In order to achieve the purpose of the self-made test equipment 100, an optical transceiver module having an emission wavelength of λ 2 and a reception wavelength of λ 1 can be generated by changing the optical transceiver module 112 having a transmission wavelength of λ 1 and a reception wavelength of λ 2 . The pulsed light source is required, so there is no need to purchase an expensive bit error rate tester, which meets the cost requirement and meets the requirements for fiber network communication detection.

Next, please refer to FIG. 2 and FIG. 3 simultaneously, wherein FIG. 3 illustrates a flow of a test method of the optical fiber network unit 120 according to an embodiment of the present invention. Figure.

First, step 200 is to provide an optical transceiver module 112. The optical transceiver module 112 has an emission wavelength of λ 1 and a reception wavelength of λ 2 . In step 210, a control unit 114 is connected to receive the electrical signal sent by the control unit 114, so that the optical transceiver module 112 generates a pulse light source Rx having a wavelength of λ 1 as a pulse source for detection. Step 230 is that after the object to be tested (the fiber optic network unit 120) receives the pulse light source having the wavelength λ 1 , the pulse light source Tx having a wavelength of λ 2 is output.

The test method further includes performing a step 220 to provide a splitter 116. The splitter 116 is connected between the optical transceiver module 112 and the optical fiber network unit 120 to split the pulse light source with the wavelength λ 1 and the wavelength λ. 2 pulsed light source Tx. In addition, the above test method further includes performing step 240 to provide an oscilloscope 118, and the oscilloscope 118 is connected to the diplexer 116 for receiving the pulse light source Tx of the wavelength λ 2 output by the optical network unit 120. In this embodiment, the quality of the optical communication is known by observing the eye width, the eye height, and the degree of edge jitter of the eye diagram in the oscilloscope.

In the above test method, the wavelength band and frequency of the optical signal used are as follows: the pulse light source Tx having a wavelength of λ 2 is, for example, a pulse light source having a frequency of 1.25 GHz and a wavelength of 1310 nm, and the pulse light source Rx having a wavelength of λ 1 is, for example, a frequency of 2.5 GHz. A pulsed light source with a wavelength of 1490 nm.

In order to achieve the purpose of the self-made test equipment 100, the test method of the present embodiment is modified by a fiber optic network device 110 (for example, a shutter device) and adjusts the parameters of the control unit 114 as long as the emission wavelength is λ 2. the receiving wavelength. When the optical transceiver module of λ 1 is changed to the optical transceiver module 112 with the wavelength of λ 1 and the receiving wavelength of λ 2 , the required pulse source for detection can be generated, so that it is not necessary to purchase expensive bit errors. Rate tester, cost-compliant, and compliant with fiber-optic network communication Testing requirements.

In summary, although the present invention has been disclosed above in the preferred embodiments, it is not intended to limit the present invention. Those who have ordinary knowledge in the technical field of the present invention can make various changes and refinements without departing from the spirit and scope of the present invention. Therefore, the scope of protection of this creation is subject to the definition of the scope of the patent application.

100‧‧‧Test equipment

110‧‧‧Fiber network equipment

112‧‧‧Optical transceiver module

114‧‧‧Control unit

116‧‧‧Differentiator

118‧‧‧ oscilloscope

120‧‧‧Fiber network unit

122‧‧‧Light emitting elements

124‧‧‧Light receiving components

Rx‧‧‧pulse source with wavelength λ 1

Tx‧‧‧pulse source with wavelength λ 2

Claims (7)

A testing device for a fiber optic network unit for detecting optical communication quality of a fiber optic network unit, the testing device of the fiber optic network unit comprising: an optical transceiver module having an emission wavelength of λ 1 and a receiving wavelength of λ 2 And a control unit connected to the optical transceiver module, the optical transceiver module is configured to receive the electrical signal sent by the control unit, so that the optical transceiver module generates a pulse light source with a wavelength of λ 1 as a A pulse source for detection, and the fiber optic network unit receives a pulse source having a wavelength of λ 1 and then outputs a pulse source having a wavelength of λ 2 . The test device of claim 1, further comprising a splitter connected between the optical transceiver module and the optical fiber network unit to transmit a pulse light source having a wavelength of λ 1 and a wavelength of λ 2 of the pulsed light source. The test apparatus according to claim 2, further comprising an oscilloscope connected to the dipole to receive the pulse light source having a wavelength of λ 2 . The test apparatus of claim 1, wherein the test equipment is modified by a fiber optic network device and the parameters of the control unit are adjusted such that the optical network device has an emission wavelength of λ 2. receiving An optical transceiver module having a wavelength of λ 1 is modified into an optical transceiver module having an emission wavelength of λ 1 and a reception wavelength of λ 2 . The test apparatus of claim 4, wherein the fiber optic network device is a light barrier. The test device of claim 1, wherein the light receiving module has a photoelectric converter for receiving an electrical signal from the control unit and converting the electrical signal to a pulse light source having a wavelength of λ 1 . The test apparatus according to claim 1, wherein the pulse light source having a wavelength of λ 2 is a pulse light source having a frequency of 1.25 GHz and a wavelength of 1310 nm, and the pulse light source having a wavelength of λ 1 is a pulse having a frequency of 2.5 GHz and a wavelength of 1490 nm. light source.