We propose and analyze a new analog optical link. This link, based on
phase modulation using a novel external modulator, has high linearity
and suppresses the impact of laser relative intensity noise. The link
increases the spurious-free dynamic range by 21 dB as compared to a co
nventional externally modulated AM link for 10 mW of received optical
power, relative intensity noise of - 130 dB / Hz, and a 15 GHz interme
diate frequency.