Fig. 1. Experimental setup. Solid, dashed, and double solid lines: optical fibers, electrical links, and free-space optical links. Lp and Lc, tunable laser; PC1 and PC2, polarization controller; G1, G2, G3, pigtailed graded-index lens collimator; ISO1 and ISO2, Faraday isolator; B1, beam splitter; OL1 and OL2, objective lens; SOA, MQW-SOA; OSA, optical spectrum analyzer; PE, Peltier element; S1, electric switch; V, digital multimeter; TTC, thermoelectric temperature controller.

Fig. 2. Transmission spectra for P_in1 = −15.9 dBm and P_in2 = −4.53 dBm (indicated with solid and dashed arrows, respectively) at 18, 23, and 28°C under SCC (upper spectra) and OCC (lower spectra). Marks and traces are the measured values and their interpolations.

Fig. 3. Exsc,oc1,2 and V_bt1,2 versus temperature. Marks and traces are the measured values and their linear interpolations accompanied by their respective formulas.

Fig. 4. e_14e, A¯ehh, and ΔE_ssc versus temperature (upper, middle, and lower graphs) calculated using experimentally obtained values (open crosses) and interpolated values (open circles and their interpolations with solid lines) of Exsc,oc1,2 and V_bt1,2.

Fig. 5. 1Se-hhER energy versus total input power at 18, 23, and 28°C. Marks and traces are the measured values and their interpolations.