Transistor Laser Power Stabilization Using Direct Collector Current Feedback Control

Microwave photonic links based on transistor lasers: Voltage modulation versus current modulation

“…This device data was also used for the device modelling that we reported in [10], and the small-signal equivalent circuit model has been used to generate the results reported below. Given that data is also available for S 11 and S 22 , we have used (7) and (8) to extract the intrinsic voltage and current modulation responses as shown in Fig.4. In order to obtain the absolute values, we used the static light-current slope characteristic value and assumed that at the low frequency…”

“…These include potentially increased bandwidth (and resonance-free frequency response) compared to conventional laser diodes, especially under common base operation [4]; demonstration of relative intensity noise close to the shot noise limit [5]; and use of collector current feedback for reduction of third-order intermodulation distortion [6] and for optical power stabilization [7]. Moreover, the development of verticallyemitting versions of the transistor laser [8] opens up possibilities for low-cost implementations based on VCSEL technology [9].…”

Circuit-level simulation of transistor lasers and its application to modelling of microwave photonic links

“…2. Option for direct collector current feedback control, thereby eliminating the need for monitor photodiodes and simplifying power stabilization circuits [10], [11]. 3.…”

Voltage and Current Modulation at 20 Gb/s of a Transistor Laser at Room Temperature

“…The transistor laser (TL) has been demonstrated with: roomtemperature continuous wave operation [14], fast spontaneous recombination lifetime (< 25ps) [15], bandfilling and voltage modulation via intracavity photon-assisted tunneling [16], [17], signal mixing via a tunnel junction [18], resonancefree high frequency operation [19], collector feedback control of laser power [20], and simultaneous 20 Gb/s electrical and optical transmission at low temperature [21]. Recently, low temperature operation of a vertical-cavity surface-emitting transistor laser (VCTL) has also been demonstrated [22].…”