KR101507775B1 - OTDR having the function of the integrated optical transceiver OSA - Google Patents

Abstract

The present invention relates to an optical transceiver embedded OSA with an OTDR function which includes an OTDR transmitter which emits an optical signal in the direction of an optical fiber, an OTDR filter which determines the state of an optical line by receiving the light which is scattered backward by Rayleigh scattering in the optical fiber, and a focusing lens which focuses an optical signal to input the optical signal emitted through the OTDR filter to a duct of the optical fiber. The present invention reduces a size and a weight and performs mass production By applying a photodiode array and a PD array structure together instead of a photo diode and a directional coupler to form the OTDR function. The rapidly increased obstacle of an optical line network is easily diagnosed and determined by the application to an external OTDR combined with an existing optical communication network infrastructure.

Description

[0002] Optical transceivers incorporating an OTDR having an integrated optical function have been developed for the integrated optical transceiver OSA

In order to configure the OTDR function, a conventional directive coupler for distinguishing the optical path between the transmitter and the receiver, and a photodiode + hole (PD) instead of the photodiode for receiving back- (OTDR) function by optimizing the optical sub-assembly (OSA) structure of the external OTDR (Optical Time Domain Reflectometer) function that can be combined with the existing OLT (Optical Line Transmission) (OSA) with a built-in optical transceiver.

Optical fiber breakage, optical connector failure, fusion splicing point, fiber breakage, etc. on the optical path cause the transmission strength of the optical signal to be weakened, which makes smooth communication difficult. Therefore, it is very important to locate and repair the position of the above anomalies on the optical path.

Optical Time Domain Reflectometer (OTDR) is an optical communications instrument that can measure up to 250 km of optical communication links and is used to locate these losses.

While light is transmitted through the optical fiber, a small amount of loss occurs due to Rayleigh scattering, and some photons scatter toward the light source, which is called backscatter. The backscattering intensity is determined by the input intensity, and the intensity of the reflected light is gradually weakened after traveling a long distance. The OTDR measures the intensity of backscattering that continues to be reflected. Using this, it is possible to measure the length of the whole section and the length of each contact point within a few seconds by measuring the loss of the entire section and the loss of each part.

1 shows a structure of an OTDR. The OTDR includes a clock generator 1, an optical generator 2, a directive coupler 3, an optical receiver An optical receiver 4, an A / D converter 5, and a display 6.

The clock generator 1 generates voltage pulses, and when the optical generator 2 is operated, the timing processor is driven to generate a laser signal and the near-infrared light is emitted to the optical fiber. In this case, When the light scattered by the receiver 4 is received and the received light is amplified and applied to the A / D converter 5, it is averaged in the A / D converter 5 and displayed on the display 6. The optical coupler 3 transmits a laser signal to enter the optical fiber, and the light from the optical fiber is reflected to be incident on the optical receiver 4.

When the OTDR and the diplexer / triplexer as described above are formed as separate product types, if a problem is found in the optical line, the OTDR is separately mounted to measure the optical line. Therefore, it is difficult to constantly monitor the optical path.

In addition, since the price per unit of OTDR equipment is quite high, there is a financial difficulty to install and operate all optical lines.

In the optical structure for implementing the OTDR technology, the directive coupler 3 is used as a directional coupler by applying a splitter or a circulator. An insertion loss of up to 1 dB is generated at a maximum of 3 dB Such a loss has a problem in that it obstructs the implementation of the function of diagnosing the condition of the high branch long-distance optical fiber network.

Korean Unexamined Patent Application Publication No. 2004-0006726 (Publication date: January 24, 2004) Korean Patent Laid-Open Publication No. 2013-0030369 (public date: March 27, 2013)

In order to solve the above-mentioned problems, the present invention provides a conventional directional coupler for distinguishing an optical path between a transmitter and a receiver in order to configure an OTDR function, and a photo diode for receiving back- Optical Sub-Assembly (OSA) structure with external OTDR (Optical Time Domain Reflectometer) function that can be combined with existing OLT (Optical Line Transmission) by applying photodiode + hole (PD) Array + Hole structure And to provide this to the OS having the high efficiency optical transceiver built-in otidial function.

In addition, it is aimed to provide an optical transceiver with built-in OTDR function that enables to diagnose the condition of the optical line in real time in combination with the existing optical line network and to manufacture a low-cost optical module by minimizing the manufacturing cost. have.

According to an aspect of the present invention, there is provided an optical signal transceiver comprising: an OTDR transmitter for emitting an incident light signal in an optical fiber direction; An OTDR filter that passes an incident light signal emitted in the direction of the optical fiber and receives a reflected light signal that is backscattered by Rayleigh scattering in the optical fiber to determine the state of the optical line; And a focusing lens for focusing an optical signal emitted from the OTDR filter into the optical path of the optical fiber. The present invention provides an optical transceiver having the built-in OTDR function.

The OTDR filter of the present invention forms a hole for passing an OTDR signal emitted from an OTDR transmitter; And a photodiode is installed on one side of the hole to receive an OTDR signal reflected from the optical fiber backscattered. The optical transceiver is provided with a built-in OTDR function.

The OTDR filter of the present invention forms a hole for passing an OTDR signal emitted from an OTDR transmitter; And at least two or more photodiodes are arranged on the outer periphery of the hole, thereby providing an optical transceiver having built-in optical function of the OS.

The present invention includes an optical transceiver built-in OTDR (Optical Transponder) function that realizes monitoring of the line status of the optical communication module by integrating OTDR (Optical Time Domain Reflectometer), which monitors the optical path state, into the optical communication module OSA An OTDR transmitter for outputting an incident light signal in the optical fiber direction; An isolator that passes the incident light signal emitted from the OTDR transmitter in the optical fiber direction and does not pass the reflected light signal reflected by the Rayleigh scattering in the optical fiber toward the OTDR transmitter; An OTDR filter that passes an incident light signal emitted in the direction of the optical fiber and receives light backscattered by Rayleigh scattering in the optical fiber to determine the state of the optical line; And a focusing lens for focusing the optical signal to be introduced into the optical fiber channel through the OTDR filter. The present invention also provides an optical transceiver having the built-in OTDR function.

The present invention is characterized in that the OTDR filter forms a hole for passing an OTDR signal emitted from the OTDR transmitter; And a photodiode is installed on the outer circumference of the hole so as to receive an OTDR signal that is reflected back from the optical fiber and reflected from the optical fiber.

The present invention is characterized in that the OTDR filter includes: a hole for passing an OTDR signal emitted from an OTDR transmitter; And a photodiode arranged in an array on an outer circumference of the hole to receive an OTDR signal. The optical transceiver is provided with an OS with built-in optical function.

The OTDR having the OTDR built-in type according to the present invention is suitable for miniaturization, light-weighting and mass production compared to the existing one by applying the OTDR filter constituting the OTDR function together with the photodiode and hole structure of the PD array type It is effective.

In addition, it is applied to the external OTDR that can be combined with the existing optical network infrastructure, and is effective for diagnosis and discrimination of the radar network failure which is rapidly increasing.

1 is a block diagram showing a conventional OTDR structure.
FIG. 2 is a block diagram showing the structure of an OSA having an optical diode built-in optical transceiver according to the present invention. FIG.
3 is a block diagram showing the configuration of the photodiode array of FIG. 2;
4 is a configuration view showing a structure in which an isolator is included in the structure of FIG. 2. FIG.

While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and will herein be described in detail.

It should be understood, however, that the invention is not intended to be limited to the particular embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

Like reference numerals are used for similar elements in describing each drawing. The terms first, second, etc. may be used to describe various components, but the components are not limited by the terms. The terms are used only for the purpose of distinguishing one component from another.

For example, the term "and / or" includes any combination of a plurality of related listed items or any of a plurality of related listed items.

Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the meaning in the context of the relevant art and are to be construed as ideal or overly formal in meaning unless explicitly defined in the present application Should not.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the structure of an OSA with an optical transceiver built-in type according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 2 is a block diagram showing the structure of an OSA having an optical AD converter with built-in optical transceiver according to the present invention, and FIG. 3 is a diagram showing the structure of the photodiode array of FIG.

As shown in FIGS. 2 and 3, the OS with the optical transceiver built-in type optical transceiver according to the present invention includes an OTDR transmitter 10, an OTDR filter 30, and a focusing lens 40.

The OTDR transmitter 10 generates a laser signal to cause the optical signal to enter the single mode optical fiber 100 and outputs an incident light signal to the OTDR filter 100 in order to detect a damage of the optical line to the allocated optical line monitoring interval Out.

The OTDR filter 30 forms a hole 31 for transmitting an incident light signal emitted from the OTDR transmitter 10 and a photodiode 32 is provided on an outer circumference of the hole 31, The diodes 32 are arranged in a regular array as shown in the figure.

The photodiodes 32 are composed of one or at least two or more arrays arranged in an array.

The OTDR filter 30 can check whether there is damage to the optical path 100 through the reflected light signal that is backscattered by Rayleigh scattering in the optical fiber 100 incident on the optical fiber 100 And receives the incident light signal.

When the incident light signal emitted through the hole 31 of the OTDR filter 30 is incident on the focusing lens 40, the focusing lens 40 transmits the incident light signal through the hole 31 of the OTDR filter 30 to be incident on the optical fiber 100, And the reflected light is applied as the incident area of the reflected light signal reflected by scattering.

In the present invention constructed as described above, an incident light signal is generated in an OTDR transmitter (laser diode) 10, and the generated incident light signal is output to the OTDR filter 30, and the hole 31 of the OTDR filter 30 And then the optical signal is emitted again to the focusing lens 40. [0042] An incident light signal emitted from the focusing lens 40 is collected at a predetermined angle and is incident on the optical fiber 100.

Rayleigh scattering occurs continuously with the progress of the incident light signal to the optical fiber 100. The reflected light signal backscattered by the Rayleigh scattering enters the focusing lens 40 again and enters the OTDR filter 30. [

The reflected light signal incident on the OTDR filter 30 is incident on a photodiode 32 provided at the outer periphery of the hole 31 to check whether or not the optical path monitoring period is damaged.

4 is a configuration diagram showing a structure in which an isolator is included in the structure of FIG.

As shown in FIG. 4, the present invention includes an OTDR transmitter 10, an isolator 20, an OTDR filter 30, And a focusing lens 40.

The OTDR transmitter 10 transmits an incident light signal to the single mode optical fiber 100 and generates a laser signal to cause the incident light signal to enter the optical fiber 100. The OTDR transmitter 10 detects an incident light Signal to the OTDR filter (10).

The isolator 20 transmits the incident light signal in the forward direction and reflects the backward scattered light reflected from the optical fiber to the backward attenuation amount with respect to the insertion loss in the forward direction, Distortion correction, impedance matching, intermodulation prevention, and stabilization of the oscillation frequency.

The OTDR filter 30 detects the presence or absence of damage to the optical line monitoring section through a reflected light signal backscattered by Rayleigh scattering in the optical fiber 100 by an incident light signal incident on the optical fiber 100 Receiving the incident light signal.

When the incident light signal emitted through the hole 31 of the OTDR filter 30 is incident on the focusing lens 40, the focusing lens 40 transmits the incident light signal through the hole 31 of the OTDR filter 30 and collects the incident light signal at a predetermined angle to enter the optical fiber 100. And is output to the OPDR filter 30 of the reflected light signal backscattered by the Rayleigh scattering in the optical fiber 100.

In the present invention configured as described above, the OTDR transmitter 10 generates an incident light signal and outputs the generated laser signal to the isolator 20.

The incident light signal emitted from the isolator 20 is incident on the optical fiber 100 through the hole 31 of the OTDR filter 30 so that the incident light signal is transmitted through the focusing lens 40 and collected at a predetermined angle.

Rayleigh scattering occurs continuously with the progress of the signal incident on the optical fiber 100. The reflected light signal backscattered by the Rayleigh scattering enters the OTDR filter 30 through the focusing lens 40 again.

The reflected light signal incident on the OTDR filter 30 is reflected toward the optical fiber 100 by the isolator 20 in the case of the reflected light signal passed through the hole 31 and reflected by the photodiode 32, the presence or absence of damage to the optical line monitoring section is checked.

The present invention is suitable for miniaturization, weight reduction, and mass production compared with the conventional OTDR filter by adopting a PD array type photodiode and a hole structure together.

In addition, it is applied to external OTDR that can be combined with existing optical network infra structure, and is useful for diagnosis and identification of radiated disturbance.

10: OTDR transmission unit 20:
30: OTDR filter 31: hole
32: photodiode 40: focusing lens

Claims (6)

In the OS with optical transceiver built-
An OTDR transmitter for emitting an incident light signal in the optical fiber direction;
An OTDR filter that passes an incident light signal emitted in the optical fiber direction and receives a reflected light signal backscattered by the Rayleigh scattering in the optical fiber to determine the state of the optical line;
A focusing lens for focusing an optical signal emitted from the OTDR filter into the optical path of the optical fiber; Lt; / RTI >
Wherein the OTDR filter forms a hole for passing an OTDR signal emitted from the OTDR transmitter;
And a photodiode is installed on one side of the hole to receive an OTDR signal reflected back from the optical fiber. delete The method according to claim 1,
Wherein at least two or more photodiodes are arranged on an outer periphery of the hole. (Optical Time Domain Reflectometer) that monitors the state of the optical line is integrated into the Optical Sub Assembly (OSA), which is an optical communication module, to monitor the line status of the optical communication module in real time. In this case,
An OTDR transmitter for emitting an incident light signal in the optical fiber direction;
An isolator that passes an incident light signal emitted from the OTDR transmitter in the direction of the optical fiber and does not pass a reflected light signal reflected by the Rayleigh scattering in the optical fiber toward the OTDR transmitter;
An OTDR filter that passes an incident light signal emitted in the direction of the optical fiber and receives light backscattered by the Rayleigh scattering in the optical fiber to determine the state of the optical line;
A focusing lens that focuses the optical signal path such that the optical signal emitted through the OTDR filter flows into the optical path of the optical fiber; Lt; / RTI >
Wherein the OTDR filter forms a hole for passing an OTDR signal emitted from the OTDR transmitter;
And a photodiode is installed on an outer circumference of the hole to receive an OTDR signal reflected and scattered from the optical fiber. delete 5. The method of claim 4,
Wherein the photodiodes are arranged in an array on an outer periphery of the holes to receive OTDR signals.

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