Abstract
A true time delay (TTD) beamforming system incorporating a wavelength tunable optical phase-lock loop (OPLL)
module is proposed and experimentally demonstrated. In the proposed system, instead of using a high-frequency
intensity modulator to modulate the optical carrier with an RF signal, we use two laser diodes (LDs) that are phase
locked to generate an RF signal, which is then sent to a fiber Bragg grating (FBG) prism to produce different time
delays. Since no optical intensity modulator is used, the system can operate at much higher frequencies with a
reduced cost. In addition, the use of only two wavelengths eliminates the power-penalty problem caused by chromatic
dispersion. In the proposed approach, the wavelengths from the two LDs are phase-locked using a
frequency-discriminator-aided OPLL. A TTD beamforming system, using the OPLL in combination with an FBG prism to
achieve tunable time delays, is investigated. Experimental time-delay results are provided.
© 2007 IEEE
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