What is different in EDFA diffrent operation mode

[MUKESH KUMAR GUPTA]

In EDFA optical amplifier ..there is operation mode ..like (Gain control , power control, saturation, single power control). what is their significant.. How they effect our system..i also attached simple design.

[alistu]

Dear Mukesh,

Each of the operation modes in the optical amplifier correspond to a condition in which the selected parameter remains constant. For example, if you choose “Power Control” operation mode option, the value of the amplifier output power is kept constant. For more detailed information about each mode, you might want to have a look at the help section of the component.

Cheers!

[Ashu verma]

OPREATION MODES

The Flat Gain EDFA subsystem enables three operation modes, which you can select in the Flat Gain EDFA Properties dialog box by clicking on Main/Operation Mode/Value. The first option is the Gain Control that maintains the gain constant and allows you to include (or not include) the amplified spontaneous emission in the calculations. In the second operation mode option, Power Control, the value of the output power is maintained constantly. The third operation mode, Saturation, considers the amplifier operating in a saturated condition – operating in an output signal power correspondent to a gain 3 dB lower than the saturated gain.

Gain control mode
In this mode, you set the desired amplifier gain (in dB units), which is given by the ratio of the total output power (Pout) and total input power (Psin), including (or not including) the generated ASE (PASE) There are no additional iterations or complicated equation solutions in this mode. The set amplifier input parameters as gain and noise figure give the performance of this sub-system to be inserted in the global system.

G=(pout-PAse)/Psin

Power control mode
The value that you define in the power control mode is the desired amplifier output power (in dBm units), which is maintained constantly. If the gain required to keep the desired output power is higher than the value of the parameter Gain, the amplifier will saturate, and the maximum power will be determined by the input power amplified by the parameter Gain. Analogous with the gain-controlled mode, there is no additional calculation involved in the designed amplifier. The output power set as input parameter defines the amplifier performance to be considered in the system where this amplifier is inserted. The ASE, which basically computes the noise introduced by the amplifier into the system, can be included (or not included) in the amplifier performance. Note that the specified output power is not degraded by the ASE noise included in the amplifier subsystems – however, this noise source is computed in the global system analysis. Signal power control mode will not include the input noise into the calculated input power.

saturation mode
In the saturation mode, it is assumed that the pump power is constant, causing the amplifier to operate in a saturated regime. The saturation power, gain, and noise figure are the parameters required by this mode

Ref. T. Okoshi, “Exact Noise-Figure Formulas for Optical Amplifiers and Amplifier-Fiber Cascaded Chains,” IEEE/OSA Topical Meeting on Optical Amplifiers and their Applications, Monterrey, PDP11, 1990.

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