Fiber Bragg Grating FBG Filter Customized by the OTDR on Optical
Network ONUs
OTDR FBG Reflector is based on Fiber Bragg Grating technology with
wide bandwidth and low insertion loss to reflect OTDR test signal.
When the optical measurement system generates a certain range of
wavelength to a Passive Optical Network (PON) which can pass
through the FBG, the FBG will reflect its own intrinsic reflection
wavelength at 1644.5nm - 1655.5nm.
FBG Reflector (1550nm)
FBG Reflectors (1550nm), also known as FBG filters, are usually
installed at the front end of optical network ONUs. Combined with
OTDR equipment, they can realize point-to-point (PTP) or
point-to-multipoint (PTMP) network monitoring of optical links. It
can accurately and quickly reflect network anomalies.
FBG Reflector (1650nm)
FBG Reflector (1650nm) utilizes the wavelength-selective properties
of the Fiber Bragg Grating, and the FBG is embedded in the adapter.
It can be easily installed in the front end of the optical network
(ONU), and cooperate with the Optical Time Domain Reflector (OTDR)
to quickly and accurately realize the fault detection of the
optical network.
Pigtail Typed FBG Reflector
Characteristics | Applications |
* High precision of reflectance at test wavelength
* Low insertion loss at traffic wavelength
* Easy to install
* Exceptional reliability and environmental stability
* Applicable for FTTH, FTTB, FTTC
* Compatible with GPON, EPON, GEPON, 10GEPON, NGPON | * Create high reflectance and wide working bandwidth at the
termination of a PON without disturbing traffic
* Test the reflectance from the central office.
* Check optical continuity of a subscriber when being added, or
when troubleshooting |
1. The FBG reflector creates high reflectivity at the PON end,
which will not affect the communication
The fiber grating reflector uses fiber grating to reflect nearly
100% of the test light pulse sent by the OTDR on the OLT side of
the optical link terminal, and the wavelengths that do not meet the
conditions pass through the fiber optic reflector normally with a
small attenuation.
When the OTDR detects that the reflected detection signal exists,
the optical fiber connection at the user end is normal. If the
reflection value is very low or there is no reflection, it
indicates that the fiber at the user end is damaged or broken. It
can make online rapid detection of optical fiber lines without
affecting the normal communication of other communication signals.
2. High stability and reliability of FBG reflector
The fiber grating reflector uses the light sensitivity of the fiber
material to write the fiber grating on the fiber core. The optical
fiber goes through the ceramic ferrule and the grating area is
partially encapsulated inside the ceramic ferrule. The fiber
grating will not be affected during the insertion and removal of
the fiber optic reflector and it will not be affected by dirt, so
it has high reliability.
3. The FBG reflector and the adapter structure are easy to connect.
Fiber optic reflectors are available in SC type and LC type. They
interact with regular adapters. It is very convenient to use them.
With the widespread implementation of fiber-to-the-home FTTH
projects, the number of users involved in optical networks
continues to increase. How to quickly and accurately detect optical
network faults is particularly important for the mainte
Application Diagram:
Specification and Ordering Information:
Product Type | HJT-FBG-R-1550-XX-XX*① |
|---|
Parameters | Minimum | Maximum |
|---|
Optical Parameters |
|---|
Pass band wavelength range (nm) | 1260 | 1625 |
Reflect band wavelength range (nm) | 1644.5 | 1655.5 |
Insertion Loss (1260nm - 1360nm) (dB)*② | - | 1.0 |
Insertion Loss (1460nm - 1600nm) (dB) | - | 1.0 |
Insertion Loss (1600nm - 1625nm) (dB) | - | 2.0 |
Insertion Loss (Reflect Band) (dB) | 21 | - |
Return Loss (1260nm - 1360nm) (dB) *③ | 35 | - |
Return Loss (1460nm - 1580nm) (dB) | 35 | - |
Return Loss (1580nm - 1620nm) (dB) | 30 | - |
Return Loss (1620nm - 1625nm) (dB) | 20 | - |
Return Loss (Reflect Band) (dB) | 0 | 1.0 |
Polarization Dependent Loss (1260nm - 1600nm) (dB) | 0 | 0.6 |
Ripple (Reflect Band) (dB) | 0 | 0.4 |
Temperature Dependent Loss (1260nm - 1600nm) (dB) | 0 | 0.5 |
Max Optical Power Handling (dBm) | 27 |
Plug Times | 500 | - |
Connector | SC/APC Male & SC/APC Female | |
Temperature Range |
|---|
Storage Temperature (℃) | -40 | 85 |
Operating Temperature (℃) | -25 | 65 |
Relative Humidity (RH%) | 5 | 95 |
*①HJY-FBG-R-1550-XX-XX,the first XX means fibre type,the second XX
means structure type
*② Insertion Loss (dB) = -10 log
(Output Power/ Input Power) [dB]
*③Reture Loss (dB)=-10 log(Reflected Power/ Input Power) [dB]. To
measure the return loss of reflect band, the light of 1650nm should
be injected from the female side of reflector
