An efficient ROF link with lower modulation index and higher extinction ratio insensitivity

Extinction ratio is an extremely important parameter for generating a millimeter wave (MM wave) signal in optical domain. However, there are some practical limitations associated with this factor. Due to which generating a MM wave signal with extinction ratio insensitivity is a challenge. For addressing the problem that when the extinction ratio is relatively low the power of undesired sidebands and carrier is higher than the desired sidebands, a MM wave generation model is designed which is not dependent on MZM extinction ratio. Further, it is shown that by inserting an optimum phase shift between the arms of the modulator, the radio over fiber system could be made stable and conversion efficient. Simulation results have verified that optimum phase shift can make the powers of undesired sidebands equal to zero which results in better receiver sensitivity of system.