1.Basic Principle：

1650nm fiber Bragg grating filter is an important device for communication link detection in the field of optical communication. The principle is equivalent to a band pass filter, which completely reflects light between 1643.5nm and 1656.5nm back (with a reflectivity of over 99.5%), allowing all other wavelengths of light to pass through. Used in the field of communication, it separates communication light (C+L band) from monitoring light to prevent monitoring light from passing through and affecting communication signals. At the same time, it can detect reflected light at the control end to achieve monitoring of the optical link.

2.Product Function：

Pass 1310+1550 nm and Stop 1650nm(1625nm).   RoHS compliance

3.Product advantages:

(1) Stable work, long lifespan, and high reliability.

(2) The grating is embedded inside the optical fiber and is not affected by environmental pollution.

(3) Both directions can work, making the system run more reliably.(4) The reflectivity of the band that needs to be blocked is high (above 99.5%), close to total reflection.

(5) Accurate wavelength control of the reflection band (1634.5nm~1656.5nm).(6) The transition zone at the edge of the bandpass is very narrow (less than 2nm), and passing through this area is full pass.(7) Using a standard and universal adapter structure for easy plugging and unplugging.

4.Product indicators:

Note:

(*) ORL(dB) = -10 log 10(Reflected Power/ Input Power) [dB];

(**)IL(dB) = -10 log 10(Output 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.

5.Operating temperature/humidity/storage:

6.Encapsulation Type:

Ø SC Type（Mono-directional/Bidirectional）