Overall optimization of high-speed semiconductor laser modules

Abstract

Based on the high frequency techniques such as frequency response measurement, equivalent circuit modeling and packaging parasitics compensation, a comprehensive optimization method for packaging high-speed semiconductor laser module is presented in this paper. The experiments show that the small-signal magnitude frequency response of the TO packaged laser module is superior to that of laser diode in frequencies, and the in-band flatness and the phase-frequency linearity are also improved significantly.optimization design, intrinsic response, equivalent circuits, semiconductor laser, optoelectronicTo satisfy the increasing demand of developing optical communication networks from 2.5 Gb/s to 10 Gb/s, and even to 40 Gb/s, high-speed optoelectronic devices such as directly modulated lasers, electro-absorption modulators and photodiodes have been steadily pushed to higher bandwidth and performance. It was generally considered in the past that the key factor to improve the frequency response of these devices was the design and manufacture of the chip rather than the packaging process. However, with the increasing rate of optical communication, the effects of the packaging parasitics has become more and more important and can not be neglected.In recent years, several kinds of packages such as TO, butterfly, mini-DIL, and other specially designed packages have been used for high-speed optoelectronic devices [16] . Microwave design is a key issue for packaging high-speed devices, and it might be quite different in various cases, such as structures of laser diodes, types of packages and application conditions. Therefore, many kinds of packaging designs and techniques have been developed [710] . Based on the high frequency techniques such as frequency response measurement, equivalent circuit modeling and packaging parasitics compensation, a comprehensive optimization design for packaging high-speed semiconductor laser module is presented in this paper,

A comprehensive consideration of bias voltage and temperature to extract the intrinsic frequency response of photodiodes

“…(iii) The parasitic parameters of the package network and the chip can be obtained by comparing with the results of packaged PD, and then with the equivalent circuit model of the whole PD can be established, consequently the comprehensive optimum design of the PD chip and its microwave packaging can be proceeded [16,17].…”

“…Figure 5 shows the fitting results calculated by eqs. (15) and (16). Table 1 gives the extracted values of the physical parameters of the PD.…”

“…The upper curve shows that the hole drift velocity increases quickly at the beginning, and then keeps invariant when the electrical field is above 30 kV/cm, while the lower curve shows that the hole drift velocity keeps increasing before the electrical field achieves Figure 2 The drift velocity vs E plot for holes in InGaAs calculated by eqs. (14) and (16). 70 kV/cm.…”

High-frequency characterization of an optical phase modulator with phase modulation-to-intensity modulation conversion in dispersive fibers

“…Once the fiber dispersion is determined from the characteristic notch frequency, the modulation index can be determined from the measured SFH, and its high-frequency degradation can be obtained by the swept-frequency measurement with a vector network analyzer owing to the fundamental component measurement [12]. For the measuring accuracy, we investigate the error dependence of the modulation index on the dispersion uncertainty by the error transfer factor…”

Normalized transfer function for characterizing conversion efficiency and harmonic distortion of all-optical sampling

“…The conversion efficiency represents the signal promotion, while the harmonic distortion reflects the signal distortion. In traditional spectrum measurement, a sinusoidal signal is input as the analog signal to be sampled, and the harmonics of the output signal are measured for comparison, from which the nonlinearity can be evaluated [6][7][8]. This method is very accurate; however, the measurement should be repeated for both input and output signals once the input signal is updated, which is not suitable for properly choosing the operating parameters in advance.…”