Hybrid devices
Hybrid devices
What is EDFA?
An erbium-doped fiber amplifier is an optical amplifier made using optical fibers doped with the rare metal erbium. On DWDM optical fiber communication lines, a large number of erbium-doped fiber amplifiers are needed to increase the relay-free transmission distance of signal light.
EDFA mainly consists of five parts: erbium-doped fiber (EDF), pump, coupler, isolator, and GFF.
To reduce the size and lower the cost, the functions of the three devices in the dotted box can be integrated into one device, which is called a hybrid device.
What are the common types of hybrid devices?
IWDM (Isolator + WDM)
The IWDM integrates the functions of polarization-sensitive photoisolators and 1550/980 nm wavelength division multiplexing.
2. TAIW (Tap Coupler + Isolator + WDM)
TAIW is one of the components of the EDFA front-end solution, integrating the functions of tap couplers, optical isolators, and 1550/980 nm wavelength division multiplexing.
3. IGFF (Isolator + Gain Flattening Filter)
IGFF combines an optical isolator and a gain flat filter (GFF), with the optical isolator serving to prevent reverse light input. The mixing of this device is relatively simple. Just add a filter plate behind the optical isolator core. When the film is coated on the filter, the transmission spectrum is exactly complementary to the transmission spectrum gain of the isolator core; that is, it plays a role in gain flattening.
The TAP PD component integrates a TAP coupler and a PD photodiode detector. TAP serves as signal shunting, while PD functions for photoelectric conversion. Due to its unique optical design, it is easy to integrate into high-density optical fiber communication systems to conduct online monitoring of the power of optical signals, thereby achieving power monitoring and management of optical signals.
At present, Hirundo can provide a full range of hybrid device products, with functions covering the five core passive components of EDFA: optical isolator (isolator), wavelength division multiplexer (WDM), gain flat filter (GFF), coupler (coupler), and TAP PD (spectrometer). In addition to the conventional miniaturized hybrid devices, we can also provide ultra-miniaturized hybrid devices with dimensions superior to those in the industry.
