840 nm Fiber Isolator for Broadband SLD’s
Rev B, Sept. 14, 2018
Page 3
Chapter 3 Description
Fiber isolators protect light sources from back reflections and signals that can
cause intensity noise and optical damage. Optical isolators, also known as
Faraday isolators, are magneto-optic devices that preferentially transmit light in
the forward direction while absorbing or displacing light propagating in the
reverse direction.
The IO-F-SLD Series Polarization-Independent Broadband Fiber Isolators are
specifically designed for use with superluminescent diodes (SLD’s). Typical fiber
isolators have a narrow isolating wavelength range with a peak isolation of about
33dB. These isolators are designed for flat isolation over a broad wavelength
range of either 100nm or 150nm depending on the model but have a lower
isolation of 23 to 32dB. This makes them an ideal choice for broad-spectrum
devices like SLD’s.
There is 0.8 m to 1.0 m of SM fiber built in to each side of the isolator, and an
arrow engraved on the body indicating the transmission direction. In addition,
each unit is tested before shipment to ensure compliance with our specifications
and a complete test report comes with every serialized part.
The main body of the isolator contains the Faraday rotator, polarizers and
retarder. The outer aluminum sleeves protect the input and output ports
containing the collimating lens and fiber ferrule.
This isolator is mounted on a baseplate with two 4-40 (M3) counterbored slots for
securing the unit to a breadboard or optical table. This base may be removed by
the user if desired. However, do not remove the lid as this is considered
disassembling and will void the warranty.
Part Number
The part number consists of the following:
IO
(The Isolator Code)
Letter
o
Polarization dependence (F/K
– Independent; J/L – Dependent)
o
Maximum Power Level (F/J
– 2W CW max; K/L - 10W CW max)
SLD1XX
(indicates broadband wavelength range in nm)
Center Wavelength
(nm)
Example:
The
IO-F-SLD100-840 isolator is a polarization independent fiber
isolator with a max power level of 2 W (CW), wavelength range of 100nm
(895 ± 75nm) and a center wavelength of 895 nm.
