A relatively high-powered beam of light is mixed with the input signal using a wavelength selective coupler (WSC). The input signal and the excitation light must be at significantly different wavelengths. The mixed light is guided into a section of fibre with erbium ions included in the core. This high-powered light beam excites the erbium ions to their higher-energy state. When the photons belonging to the signal at a different wavelength from the pump light meet the excited erbium atoms, the erbium atoms give up some of their energy to the signal and return to their lower-energy state. A significant point is that the erbium gives up its energy in the form of additional photons which are exactly in the same phase and direction as the signal being amplified. So the signal is amplified along its direction of travel only. This is not unusual - when an atom "lases" it always gives up its energy in the same direction and phase as the incoming light. Thus all of the additional signal power is guided in the same fibre mode as the incoming signal. There is usually an isolator placed at the output to prevent reflections returning from the attached fibre. Such reflections disrupt amplifier operation and in the extreme case can cause the amplifier to become a laser. The erbium doped amplifier is a high gain amplifier.
I.high power optical amplifier - Features
1. The OLAH is a fiber amplifier and power supply integrated in a 1RU&2RU shelf.
Multiple output ports can be chose.
2. The OLAH incorporates electrical control circuitry with a digital signal
processor and includes photodiodes for monitoring the optical
input and output power through tap couplers.
3. Double cooling system can protect the pump laser to work in a long time.
4. RJ45 and RS 232 port, SNMP management system.
5. Good stability, VFD displays the working conditions, good trouble alarm system.
Ⅱ.high power optical amplifier - Technical Parameters
Model | -20-27 | -28 | -29 | -30 | -31 | -32 | -33 | -34 | -35 | -36~38 |
Output Power (dBm) | 20-27 | 28 | 29 | 30 | 31 | 32 | 33 | 34 | 35 | 36~38 |
CATV Input power (dBm) | -3～10 | |||||||||
CATV Wavelength Range (nm) | 1530～1565 | |||||||||
Output port | 8,16,32,64 | |||||||||
Output power stability (dB) | <±0.2 | |||||||||
C/N (dB) | ≥45 | |||||||||
CSO (dB) | ≥63 | |||||||||
CTB (dB) | ≥63 | |||||||||
Bias oscillation sensitivity (dB) | <0.2 | |||||||||
Bias oscillation dispersion (PS) | <0.5 | |||||||||
Optical return loss (dB) | ≥45 | |||||||||
CATV Fiber connector | FC/APC,SC/APC | |||||||||
Noise ratio (dB) | <5.0(0dBm optical input) | |||||||||
connector | RJ45(SNMP) ,RS232 | |||||||||
Power loss (W) | ≤130 | |||||||||
Working Voltage (V) | 220V(90～265),DC-48V | |||||||||
Working Temp (℃) | -20～85 | |||||||||
size (mm) | 540(L)×486(W)×88(H) | |||||||||
Ⅲ.high power optical amplifier - Panel display
Ⅳ. high power optical amplifier - Important Notes
1. Please avoid eyes directly to output.
2. Please turn off the power first then plug in or out the patch cord
3. EDFA has very small influence on CSO and CTB, but has big influence in C/N.
The input optical power influence the C/N. High optical input gets higher C/N. Please see the
following data. The minimum optical input should be 4dBm.
C/N and Optical Input
Optical In(dBm) | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | -1 | -2 | -3 |
C/N(dBm) | 52.4 | 52.2 | 52.0 | 51.6 | 51.1 | 50.6 | 50.1 | 49.5 | 48.8 | 48.1 | 47.3 |
Ⅴ.high power optical amplifier Normal - Trouble Solution
The display in screen of the EDFA shows the correct output of the pump laser, if the output
is lower than showed, please check as the following steps.
1. Check the optical meter. Because of the high out of EDFA, please don't use Chinese
optical meter to test the EDFA, the advised one is EXFO.
2. The output adaptor burnt.
3. The operator plug in and out the patch cord when the power on, this will burnt the
output pigtail connector and make the output lower. The solution is to splice a new
the pigtail connector.
4. Some operators use the bad quality patch cord and its fiber core is too long, after
connected, it will hurts the pigtail of pump laser output. In this condition, in the
first test, the output is correct, but in the second time, the output become lower.
The solution is also to splice a new pigtail connector.
5. The wavelength of the input deviates far from 1550nm, it will make both the
outputport and screen show lower.
6. Too low input will make both the output and screen show lower.
Ⅵ.high power optical amplifier - Precautions:
1. Before installation or operation of unit, please carefully go through the user's manual.
2. OLAH Series EDFA should be serviced only by qualified personnel.
3. Before proceeding with installation and/or operation of transmitter, please assure that transmitter is well earthed.
4. OLAH series EDFA are Class III laser products. Use of controls, adjustments, and procedures other than those
specified herein may result in hazardous laser radiation exposure.
Ⅶ.high power optical amplifier - Warranty Term
OLAH Series EDFA are covered by Two YEARs Limited Warranty, which starts from the initial date of
your purchase. We provide its customer whole-lifetechnical supports.If warranty is expired, repair service
only chargesparts (if required). In the event that a unit must be returned for service, before returning the
unit, please be advised that:
1. Warranty mark pasted on the housing of unit must be in good conditions.
2. A clear and readable material describes model number, serial number and troubles should be offered.
3. Please pack the unit in its original container. If the original container is no longer available, please pack the unit in at least 3 inches of shock absorbing material.
4. Returned unit(s) must be prepaid and insured. COD and freight collect can not be acceptable.
NOTE: we do not assume responsibility for damage caused by improper packing of returned unit(s).
The following situation is not covered by warranty:
1. The unit fails to perform because of operators' faults.
2. Warranty mark is modified, damaged and/or removed.
3. Damage caused by Force Majeure.
4. The unit has been unauthorized alteration and/or repaired.
5. Other troubles caused by operators' faults.
