The microwave photonic sensing system is widely investigated recently. The transmission character between two typesof optical sensing schemes interrogated by microwave approach is investigated. The first case is that the incoherent lightis modulated by the electro-optic modulator firstly and then filtered, and the second case is that the incoherent light isfiltered firstly and then modulated. Experimental results show that the optical loss and microwave loss of the linksbetween two cases are different. By utilizing a fiber with the length of 2km between and optical filter, the optical loss ofthe links in case I is 1.8dB lower than that in case II, and the microwave loss of the links in case I is 3.8dB lower thanthat in case II. To conclude, the non-reciprocal character appears in this incoherent microwave photonics links.
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