Abstract
The ability to transmit millimeter-wave signals over fiber opens up new possibilities for distributed antenna networks and phased- array systems. Previous results have demonstrated the transmission of millimeter-wave signals at 40 Mbit/s around 35 GHz by using narrow-band resonant enhancement.1 In this paper we report a system demonstration of 300-Mbit/s binary-phase- shift-keyed (BPSK) signal transmission at a carrier frequency of 39 GHz through 2.2 km of optical fiber, using a recently reported feedforward modulation technique.2 A bit error rate (BER) of 10-9 at a received optical power of —9.8 dBm has been achieved. The experimental setup is shown in Fig. 1. The dotted enclosure represents the feedforward millimeter-wave optical modulator. Details of the operational principle of this modulation technique can be found in Ref. 2. In brief, a beat note at 36.5 GHz is generated by photomixing two 1.3-μιη distributed-feedback (DFB) lasers each with a free-running linewidth of 15 MHz and emitting at an optical power of 8 mW. The beat note is electrically-mixed with the input millimeter-wave signal that is centered at 39 GHz and contains pseudorandom (215 — 1) nonreturn-to-zero (NRZ) BPSK data at 150-300 Mbit/s. The resulting i.f. error signal at fD = 39.0 — 36.5 = 2.5 GHz is fed forward to an external optical modulator with a 4-GHz electrical bandwidth.
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