Sf. Lim et Cj. Changhasnain, A PROPOSAL OF BROAD-BANDWIDTH VERTICAL-CAVITY LASER-AMPLIFIER, IEEE photonics technology letters, 7(11), 1995, pp. 1240-1242
We propose a generic vertical-cavity amplifier (VCA) using a coupled-c
avity design to broaden the bandwidth. Calculations are made for cavit
ies with GaAs-AlAs and GaAs-AlxO2 distributed Bragg reflectors (DBR).
We found that at reasonable pumping levels the VCA increased the bandw
idth by 85% (GaAs-AlAs) to 500% (GaAs-Al2O2) as compared to a simple t
wo-mirror structure similar to vertical-cavity surface-emitting lasers
. In particular, the GaAs-AlAs VCA shows a bandwidth of 2 mn at 6-dB s
ignal gain, while the GaAs-AlxO2 VCA demonstrates a 5-nm bandwidth at
6-dB signal gain with no ripple at required single-pass power gain of
similar to 2-2.5%. Furthermore, as large as 30-nm bandwidth in a lossl
ess bandpass filter can be obtained.