Abstract
We present the design of a widely tunable laser diode which employs a
coupled-cavity sampled grating rear reflector with interleaved connections
for use as the wavelength discrimination and tuning enhancement element.
Simulations show that this new reflector in conjunction with a cleaved
output facet for the laser yields a source with a tuning range of ${>}50$ nm. Due to the absence of a front grating reflector a highly
uniform output power can be obtained for a fixed gain current with a 0.35 dB
variation achievable for an output power of ${+}15$ dBm across 195 modes on a 25 GHz spacing. The SMSR for all modes
is close to 40 dB. The device can be integrated with a wideband front
reflector at the expense of an increase in threshold current and a reduced
tuning range.
© 2010 IEEE
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