The BBOF transmission scheme is used to transport radio frequency (RF) wireless signals as a base band signal over fiber. The system then modulates the decoded base band signal to the required radio frequency only at the AP as shown in Figure 2. In this scheme, the transmitted downstream data is unconverted directly by optical modulator and propagates as a base band signal over optical fiber. The AP receives the base band optical signal which is directly detected and decoded by a photo diode (PD), a low pass filter (LPF), and decoder. The decoded bit downstream is then modulated by the RF modem at the carrier frequency ƒRF. In the upstream direction, the RF modem receives the up link wireless signal at the AP, and then decodes it to a bit upstream which is send back to the CO as a base band signal over fiber.