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- W1552912349 abstract "We experimentally and theoretically studied coupling coefficients K as high as 300 cm-l and found lower feedback sensitivity, lower influence on facet reflectivity and excellent high frequency behaviour without any penalty in mode jumps. Large coupling coefficients and abrupt U4 phase shifts are expected to be crucial for high single longitudinal mode performance1p2. However, in these highly coupled devices mode hopping has been expected to occur due to nonlinear effects3 caused by the strong non uniformity of the spatial field distribution inside the cavity. Optical spectrum analysing below and above threshold as well as high bit rate NRZ transmission experiments have been performed. Measured intensity modulations, eye diagrams and linewidths under modulation are compared to appropriate data obtained from a model based on rate equations. From spectra measured near threshold (fig. 1) we find the stopband width and thus determine K ranging between 1SO and 300 cm-' for our devices (3 KL up to 9 1. These devices reveal low threshold currents (>11mA), stable single mode operation (fig. Z), ultrahigh side mode suppression ratio >SodB (fig.3), a very good high bit-rate behaviour (fig. 4), lower feedback sensitivity, and lower sensitivity on facet reflectivity. In extremely strong coupled devices the external quantum efficiency can be relatively low (0.03 - 0.1 W/A). This disadvantage, however, can be reduced by placing the U4 phase shift with it's strong local photon pile-up near to the front facet. Our studies demonstrate, that we can obtain devices with very high coupling revealing some important advantages without any penalty due to the strong influence of nonlinear effects. E.g. the non uniformity of the spatial field distribution which is known to lead to" @default.
- W1552912349 created "2016-06-24" @default.
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- W1552912349 date "1990-01-01" @default.
- W1552912349 modified "2023-09-28" @default.
- W1552912349 title "1.53 /spl mu/m InGaAsP/InP first order /spl lambda//4 shifted DFB lasers with high coupling coefficients" @default.
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- W1552912349 doi "https://doi.org/10.1109/islc.1990.764489" @default.
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