Nonlinear wavelength crosstalk is one of the key factors which restrict transmission distance and detection performance of remotely interrogated optical fiber hydrophone (OFH) systems with dense wavelength division multiplexed (DWDM) and time division multiplexed (TDM) structures. In this paper, wavelength power conversion and nonlinear crosstalk problems caused by stimulated Raman scattering (SRS) under the condition of multi-wavelength and high peak power injection are analyzed theoretically and simulated. And a crosstalk suppression structure based on wavelength-staggered emission is proposed. Experimental results of the remotely interrogated 16DWDM×8TDM OFH system show that with this wavelength-staggered scheme, the wavelength optical power imbalance after 100 km transmission is reduced by 9.7 dB compared with the original scheme, and phase noises of the hydrophone channels associated with the wavelength 1 and wavelength 16, which are most affected by the crosstalk, are reduced by 20.0 dB and 10.5 dB, respectively, to the level of -97.0 dB and -96.5 dB. So the results verify the validity of the wavelength-staggered structure. The study can provide an important reference for the design of the optical emission and transmission links of remotely interrogated OFH systems.