The OC is composed of
a 405-nm optical isolator (Thorlabs IO-5-405-LP) and
a 12 optical splitter. LD1 is directly modulated by a
9.6 Gbps/5 GHz 16-QAM-OFDM data signal.
Meanwhile, LD3, with a central wavelength of 405 nm,
is injection-locked by LD1 via OC2 and PC2. All LDs
(LD1, LD2, and LD3) have the same optical
characteristics. The frequency response of the twostage
injection-locked 405-nm LD transmitter is
measured at the port 3 of OC2 by using an optical
network analyzer. The 16-QAM-OFDM data signal is
generated offline by MATLAB program and uploaded
into an arbitrary waveform generator (Tektronix
70001A).