The influence of bias current and ASE injection power on the side-mode suppression ratio (SMSR), relative intensity noise (RIN) and gain of the ASE-injection wavelength-locked Fabry-Perot laser diode (F-P LD) have been studied experimentally. Results show that the SMSR and RIN depend on the bias current for a given ASE, and there is different optimum bias current in terms of the SMSR and RIN. With the influence of detailed spontaneous recombination mechanism and its temperature dependence and the temperature- and wavelength-dependent material gain, we propose a static model of the wavelength-locked F-P LD based on nonlinear etalon theory. The temperature dependence of gain and saturation power of wavelength-locked F-P LD is analyzed theoretically with the model. The results show that the saturation power increases as we increase the operation temperature, while it decreases as we increase the reflectivity of front facet.
We discuss wishes for next generation access networks and proposed and demonstrated WDM-PONs based on wavelength locked F-P LDs. These WDM-PONs guarantee color-free (or wavelength independent) operation of ONTs and OLT transceivers. The scalability of the WDM-PON is also investigated in terms of transmission length, split ratio, and transmission speed.
We demonstrate an optimization method of the decision threshold level in optical receivers for WDM-PONs based on wavelength locked Fabry-Perot laser diodes. The decision threshold level is controlled by the average optical power. For the WDM-PON with 100 GHz channel spacing, we reduced required injection power for color-free operation by 6 dB using the proposed method.
We propose and demonstrate a fiber-optic feeder network for microcellular CDMA personal communication service. The proposed network is based on a passive double-star architecture. The relaxed CNR and dynamic range requirements of CDMA signals allowed the use of double-star architecture. The proposed network was demonstrated by using various light sources to examine the possibility of using inexpensive components. The result shows that this network could be implemented cost-effectively by using a Fabry-Perot laser for the downlink and LED's for the uplink.
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