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Fabry-Perot (F-P) etalon (25GHz finesse: 7.5)
Our Fabry-Perot etalons are free-space based Fabry-Perot etalons. They provide periodic wavelength comb transmission. They include 2-port transmission type, 3-port transmission/reflection type and 4-port transmission type. The 2-port type provides transmission spectrum, the 3-port type provides transmission and reflection spectrum, and the 4-port type provides a phase delay (when the same signal is input into the two input ports, there is a phase delay at the two output ports). Our company's Fabry-Perot etalons can cover the C-band wavelength, including single-mode and polarization-maintaining fibers. The free-space range (FSR) and finesse (F) of the etalons can be customized according to customer requirements. They are widely used in optical communications, fiber Bragg grating sensors, and tunable fiber lasers.
Product features:Available in X, O, S, C, and L bands、 Compact passive package、 Low insertion loss、 SM or PM fiber pigtails、 High optical power handling
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Application area:Wavelength locker、 Wavelength division multiplexing telecommunication network、 Handheld spectrum analyzer、 Fiber Bragg grating sensing system、 Tunable filter laser、 Tunable filter
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Parameters
Parament | Value |
Central wavelength | 1550nm(customizable) |
Spectral width | 40nm |
Typical FSR | 25, 50, 100GHz (customizable) |
Typical FSR tolerance | ±0.005GHz for 100GHz FSR |
Fineness | 2.5~40 |
Insertion loss | <0.8dB |
Polarization Dependent Loss(PDL) | <0. 15dB |
Extinction Ratio(ER) | >20dB (PM Fiber) |
Return loss | >45dB |
Phase delay | 0 to λ/4 (for 4-port device only) |
Maximum input power | 500mW (CW) |
Operating temperature | 10 to 50 °C |
Storage temperature | -20 to 75 °C |
Dimension | Ø5.5 x 35mm (L) or 40mm (L) |
Spectral shape

2-Port Pigtail Etalon Spectral Shape

3-port pigtail etalon spectral shape
Test the frequency discrimination characteristics of the standard at 1572nm
Instruments used: 1550nm SLD, spectrometer, laser driver
Circuit connection diagram

Spectrometer test results








Ordering Information
WLFE-A-B-C-D-E-F/G-H/I
A: Port type
2: 2 Port
3: 3 Port
4: 4 Port
B: Central wavelength
1550: 1550nm
C : Free space range of etalon in GHz(FSR)
25: 25GHz,
100: 100GHz。
D: Fineness
2.5 - 40
E: Fiber type
SM: Single mode Fiber
PM:Polarization-mode Fiber
F: Pigtail cable diameter(um)
0.9: 0.9um loose tube diameter
G: Pigtail length(m)
1: 1m
H/I: Connector type
FC/APC
FC/PC
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