Transmission improvement in fiber wireless links using fiber Bragg gratings

Differential Service in a Bidirectional Radio-over-Fiber System over a Spectral-Amplitude-Coding OCDMA Network

“…In this section, numerical analysis according to Equation (10) and simulations done by Optisystem TM are both demonstrated. Received user power P is defined as P sr = P 1 = P 2 /2, and user numbers are K 1 = K 2 = 3.…”

“…However, the broadband light source (BLS) used for SAC encoding is not suitable for generating the optical millimeter, which is required by most wavelength reuse schemes. A coherent light source, generally a laser, is used to generate optical millimeters for up-and downlink transmissions by modulation schemes such as a double side band (DSB) [9] or a single side band (SSB) [10]. Unlike a laser with a near impulse spectrum, the broadband light source (BLS) for SAC encoding occupies a range of wavelength band of 1 to 10 THz.…”

Performance Improvement and Cost Reduction Techniques for Radio Over Fiber Communications

“…Suppressing the optical carrier with respect to the modulation sidebands increases the depth of optical modulation, thereby beneficially improving the attainable receiver sensitivity [56], [66], [67], [49], where the typical value of the optimum Carrier to Sideband Ratio (CSR) is 0 dB. Fig.…”

“…The FBG filter of Fig. 32 can also be employed before fiber transmission in order to simplify the RAP architecture [56]. However, this latter technique would prevent the implementation of wavelength re-use, since the reflected carrier power would no longer be available at the RAP but only at the BS.…”

“…2005 Attygalle et al [56] A Fiber Bragg Grating (FBG) filter was used for suppressing the optical carriers of Carrier Suppression OSSB and Optical Double Side Band (ODSB) signals, which improved the receiver sensitivity by upto 7 dB. 2005 Gu et al [57] A sub-picometer bandpass filter having a 3 dB bandwidth of 120 MHz was designed and fabricated.…”