#GAIN BANDWIDTH PRODUCT PC#

Continuous single-frequency tuning was observed with the laser producing 3 mW of output. Compression tuning can extend the tuning range, and a tuning range of 32 nm has been reported for a short EDFGL (3 cm) in a MOPA configuration. Since the gratings and the fiber length tune together, the laser remains stable. Ball and Morey stretch-tuned a pair of Bragg gratings of a 100-mm-long erbium fiber laser and showed 9 GHz mode-hop-free operation. Tunability is possible with fiber Bragg gratings by strain or temperature tuning (see Chapter 3). The gain bandwidth of doped fibers is several tens of nanometers. Raman Kashyap, in Fiber Bragg Gratings (Second Edition), 2010 8.5.2 Tunable Single-Frequency Sources The CFA performance can be improved immeasurably with a good layout, good decoupling capacitors, and low inductance components. Breadboarding and lab testing are a must with CFAs.

#GAIN BANDWIDTH PRODUCT PC#

A prudent circuit designer scans the PC board layout for stray capacitances, and he eliminates them. Stray capacitance on the inverting input node or across the feedback resistor always leads to peaking, usually to ringing, and sometimes to oscillations.

This situation precludes CFAs from operation in the differential amplifier configuration. The inverting input impedance is very high, but the noninverting input impedance is very low. As R F is increased stability increases, but the bandwidth decreases. Stability is dependent on the feedback resistor as R F is decreased, stability is decreased, and when R F goes to zero the circuit becomes unstable. Bruce Carter, Ron Mancini, in Op Amps for Everyone (Fifth Edition), 2018 9.11 SummaryĬonstant gain-bandwidth is not a limiting criterion for the CFA, so the feedback resistor is adjusted for maximum performance.

Gain bandwidth product