We propose and demonstrate the generation and detection of two new return-to-zero staggered differential phase-shift keying(RZ-SDPSK) modulation formats with 33% duty cycle and 67% duty cycle for 100 Gbit/s transmission.The their transmission characteristics shows that the generated RZ-SDPSK signal with 33% duty cycle is especially suited for single carrier transmission in the metropolitan area network without first-order-PMD compensation and with a lower bandwidth OBPF,and the CSRZ-SDPSK with 67% duty cycl...