A scheme is proposed for millimeter-wave signal generation without filters. No optical or electrical filters are used in the scheme, and the scheme can obtain 16-tupling millimeter-wave signals. The scheme adopts the structure of cascading a three-parallel Mach-Zehnder modulator structure and a single Mach-Zehnder modulator. All redundant sidebands can be suppressed very well by adjusting the parameters of the system and only 8th order optical sidebands are left. The scheme can obtain 16-tupling millimeter-wave signals without any optical or electrical filters. The theoretical analysis for this proposed scheme are provided, and the effects of modulation depth, extinction ratio, phase shifter offset and modulator bias on the system are verified by simulation. The 10 GHz radio frequency signal is mixed with the 2 Gbit/s non-return-to-zero pattern data as the driving signal of the Mach-Zehnder modulator, it is verified that the power cost of the system link through 50 km optical fiber transmission is only 1.0 dB. The system can meet the needs of communication systems with good transmission performance. The scheme has certain reference value for the generation of high frequency millimeter wave signal without filters.