Based on optical frequency combs (OFC), we propose an efficient and flexible multi-band frequency conversion scheme for satellite repeater applications. The underlying principle is to mix dual coherent OFCs with one of which carrying the input signal. By optically channelizing the mixed OFCs, the converted signal in different bands can be obtained in different channels. Alternatively, the scheme can be configured to generate multi-band local oscillators (LO) for widely distribution. Moreover, the scheme realizes simultaneous inter- and intra-band frequency conversion just in a single structure and needs only three frequency-fixed microwave sources. We carry out a proof of concept experiment in which multiple LOs with 2 GHz, 10 GHz, 18 GHz, and 26 GHz are generated. A C-band signal of 6.1 GHz input to the proposed scheme is successfully converted to 4.1 GHz (C band), 3.9 GHz (C band) and 11.9 GHz (X band), etc. Compared with the back-to-back (B2B) case measured at 0 dBm input power, the proposed scheme shows a 9.3% error vector magnitude (EVM) degradation at each output channel. Furthermore, all channels satisfy the EVM limit in a very wide input power range.

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A novel photonic technique of millimeter-wave (mm-wave) sub-carrier generation using optical parametric loop mirror (OPLM) and fiber Bragg grating (FBG) is proposed. Due to the four-wave mixing (FWM) effect and loop reflection characteristic in an OPLM, a carrier-suppressed modulation signal is able to generate two new harmonic components with six times frequency spacing of the modulation frequency and the initial two optical tones can be reflected back to the input port by the OPLM itself, which servers as the first order filtering. At the transmission port of the OPLM, a matching FBG will give further suppressing on the pump light. Finally, a millimeter-wave sub-carrier will be obtained after the FBG.

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