L-Band Booster Optical Amplifiers (BOAs)
- L-Band and Super L-Band
- Polarization Maintaining: Amplifies Only One Polarization State
- Available with Either PM or SM Fiber Pigtails (1.5 m), 2.5 dB Loss at Each End of Chip
- FC/APC Connectors
- High Saturation Power, High Efficiency
- AR Coated Endfaces (R < 0.1%)
- Typical Applications: Boosting Laser Transmitters, Compensating for Transmit MUX/DeMUX Insertion Loss, Optical Shutter
|Item #||Center Wavelength||3 dB Bandwidth||SaturatedOutput |
Power (@ -3 dB)
|Small Signal Gain|
(@ Pin = -20 dBm)
|BOA1080S and BOA1080P||1590 nm Typical||90 nm Typical||15 dBm Typical||26 dB Typical||7.0 dB Typical|
|BOA1082S and BOA1082P||1625 nm Typical||80 nm Typical||13 dBm Typical||18 dB Typical||7.0 dB Typical|
For more specifications, please view the Specs and Performance Plots tabs
Booster Optical Amplifiers (BOAs) are single-pass, traveling-wave amplifiers that perform well with both monochromatic and multi-wavelength signals. Since BOAs only amplify one state of polarization, they are best suited for applications where the input polarization of the light is known. For applications where the input polarization is unknown or fluctuates, a Semiconductor Optical Amplifier (SOA) is required. However, the gain, noise, bandwidth, and saturation power specifications of a BOA are superior to that of a SOA because of the design features that make the SOA polarization insensitive.
The BOA consists of a highly efficient InP/InGaAsP Multiple Quantum Well (MQW) layer structure. As seen in the schematic to the right, the input and output of the amplifier is coupled to the reliable ridge waveguide on the optical amplifier chip. Losses typically range from 1.5 to 2.5 dB for the fiber-to-chip and chip-to-fiber coupling (each). These coupling losses affect the total gain, noise figure (NF), and saturation power (Psat). While the gain produced by the amplifier exceeds that of the losses, these losses remain an important factor in determining the device's performance. For instance a 1 dB drop in input coupling efficiency increases the noise figure by 1 dB. Alternatively, a 1 dB drop in output coupling decreases the saturation power by 1 dB.
The device is contained in a standard 14-pin butterfly package with either SMF or PMF pigtails that are terminated with FC/APC connectors. Optional polarization-maintaining isolators at the input, output, or both input/output are also available (specifications may vary with different configurations). Please contact Tech Support to order such a device.
The LDC1300B butterfly LD/TEC controller is one possible controller for these amplifiers. The LD/TEC controller and mount combination offers full PC control via RS232.
For a complete listing of products and services available from Covega, Thorlabs' Division of Quantum Electronics, please download the product catalog (3.5 Mb).
|Item #|| ||BOA1080S and BOA1080P||BOA1082S and BOA1082P|
|Operating Current||IOP||-||600 mA||750 mA||-||600 mA||750 mA|
|Center Wavelength||λC||1570 nm||1590 nm||1610 nm||1600 nm||1625 nm||1650 nm|
|Optical 3 dB Bandwidth||BW||80 nm||90 nm||-||70 nm||80 nm||-|
|Saturation Output Power|
(@ -3 dB)
|PSAT||12 dBm||15 dBm||-||10 dBm||13 dBm||-|
|Small Signal Gain|
(@ Pin = -20 dBm, typical λC )
|G||23 dB||26 dB||-||14 dB||18 dB||-|
|Gain Ripple (RMS) @ IOP||δG||-||0.05 dB||0.2 dB||-||0.05 dB||0.3 dB|
|Noise Figure||NF||-||7.0 dB||9.0 dB||-||7.0 dB||9.0 dB|
|Forward Voltage||VF||-||1.5 V||2.0 V||-||1.5 V||2.0 V|
|Chip Length||-||-||1.5 mm||-||-||1.5 mm||-|
|Waveguide Refractive Index||-||-||3.2||-||-||3.2||-|
|TEC Operation (typ/max @ TCASE = 25/70 °C)|
|- TEC Current||ITEC||-||0.12 A||1.5 A||-||0.12 A||1.5 A|
|- TEC Voltage||VTEC||-||0.25 V||4.0 V||-||0.25 V||4.0 V|
|- Thermistor Resistance||RTH||-||10 kΩ||-||-||10 kΩ||-|
Semiconductor Optical Amplifiers (SOAs and BOAs) are similar in design to Fabry-Perot Laser Diodes. The difference being that Fabry-Perot laser diodes have reflective coatings on both end faces of the semiconductor chip. The optical feedback from the end faces establishes a cavity in which lasing can occur. SOAs and BOAs have an anti-reflection (AR) coating on both end faces of the semiconductor chip. The AR coatings limit the optical feedback into the chip so that lasing does not occur.
As is typical for all amplifiers, SOA/BOAs operate in two regimes: a linear, flat, constant gain regime and a non-linear, saturated output regime. When used to amplify a modulated signal, the linear regime is typically used to eliminate pattern-dependent distortion, multi-channel cross-talk and transient response issues common to EDFAs. The non-linear regime is used to take advantage of the highly non-linear attributes of the semiconductor gain medium (cross-gain modulation, cross phase modulation) to perform wavelength conversion, optical 3R regeneration, header recognition, and other high-speed optical signal processing functions.
For a CW input signal, the amount of power that can be produced by the amplifier is determined by the saturation output power (Psat) parameter. Psat is defined as the output power at which the small-signal gain has been compressed by 3 dB. The maximum amount of CW power that can be extracted is approximately 3 dB higher than the saturation power.