What are Fiber-Bragg-Grating (FBG) laser diodes?
Fiber-Bragg-Grating (FBG) laser diode (Butterfly package)
Fiber Bragg grating or FBG laser diodes are diodes that have a distributed Bragg reflector at the core of the single-mode optical fiber. FBG lase diode normally operate in a single-mode and has an output wavelength ranging from 405 to 1650 nm. These diodes are available in DIP, DIL, chip, Butterfly, mini-butterfly, bar, sub-mount, chip on sub-mount, and C-mount packages. The FBG laser diodes are ideal for dense wavelength division multiplexing (DWDM), EDFAs for small package designs, high bit-rate, and channel-count EDFAs, CATV distribution, and solid-state pumping applications.
Fiber-Bragg-Grating (FBG) laser diode
The diode emits light that has a wavelength equal to the Bragg wavelength. The FBG acts as feedback to this laser and locks the emission wavelength. These laser diodes provide a noise-free, narrowband spectrum even under temperature, drive current, and optical feedback changes.
Key Specifications of FBG Laser Diodes:
Central wavelength: Represents the wavelength of laser emitted from the FBG laser diode. The wavelength is represented in nm (nanometre). An FBG laser diode can have a wavelength range of 405 to 1650 nm. A higher wavelength FBG laser diode is also available.
Technology: Fiber-Bragg-Grating laser (FBG)
Type: Fiber-coupled laser diode. A fiber-coupled FBG laser diode emits light through the fiber optic medium.
Fiber modes: Single-mode
Spectral width (FWHM): It is the width of the optical spectrum at the half-maximum power. Typically, the spectral width of FBG laser diodes can vary from 0.5 to 2 nm.
Output power: Represents the output power of the laser diode. An FBG output power is in the range of mill watts.
Threshold current (Ith): It is the current at which the output optical power increases sharply. When the laser diode is biased below this threshold current, the output optical power will be very low. Mostly, the threshold current of an FBG laser diode varies in the mA range.
Working current: It is the driving current or input currents when the laser diode reaches the rated power. Usually, the operating current of an FBG laser diode can from hundreds of mA to Ampere range.
Operating voltage: Represents the supply voltage. Mostly, an FBG laser diode can have the operating voltage range from 1.5 to 3.3 V or in-between this range. Another voltage rating is also available.
Reverse voltage: Represents the maximum allowable reverse voltage, when it is applied across the laser diode. Beyond the reverse voltage, the diode will damage. Usually, the reverse voltage of an FBG laser diode from 2-2.5 V.
Operating temperature: Represents the safe operating temperature of the FBG laser diode. Typically, it can have the range of -30 °C to + 70 °C.
Storage temperature: Represents the storage temperature range of FBG laser diode. Typically, it can have the range of -45 °C to + 80 °C.
Package type: Represents the type package used in the FBG laser diode. Usually, the FBG laser diodes are available in the Butterfly (BTF), mini-butterfly, TO-Can, chip on Sub-mount, and C-mount, chip, and DIL packages.
