In this paper, one method for accurate evaluating EDFA small signal gain spectrum is designed. According to this method, EDFA can be regarded as a box. One can measure and determine its gain spectrum accurately by using a single continuous wavelength DFB laser and a wide spectrum light source.
Homodyne crosstalk can be divided into two kinds: coherent and incoherent crosstalk in WDM optical network. A general analyzing model of crosstalks in WDM optical network is developed in this paper. According to the model, two different kinds of crosstalks, viz. coherent crosstalk and inconherent crosstalk, are distinguished from each other. The experimental results, 1dB power penalty for about 20dB coherent and incoherent crosstalk signal well agree with theoretical one, could be important to the WDM optical network designing.
Optical add/drop multiplexers (OADM) can play an important role in WDM optical transport network systems. In this paper, we focus on the performance of using OADM integrated with pre-EDFA in multi-wavelength optical transmission networks called OADM subsystem. We calculate the receiver sensitivity incurred in an OADM subsystem with pre-EDFA. We theoretically investigate the effects of the spontaneous emission factor, and pre-amplifier gain, spontaneous emission factor, on the receiver sensitivity. The theoretical results agree well with the experimental results we have done.