High performance modules of 2.5 Gbps modulator integrated DFB lasers using new RF impedance matching technique

Development of a novel broadband impedance matching network for 40 Gb/s electro‐absorption modulators

“…Under reverse bias, the EAMs exhibit a high impedance operation. Because of degraded signal injection efficiency and strong reflection, the high impedance characteristic of the EAMs can limit the high‐speed performance of the device [6, 7].…”

“…To reduce the input return loss, Ghiasi et al [11] have proposed to use a microstrip Chebyshev transformer connecting with a laser diode to obtain the match at a centre frequency of 10.5 GHz, whereas Music et al [12] have proposed to employ a low‐pass impedance matching filter in a low‐cost laser module. Besides, with a “+” shaped microstrip line, the RF return loss of an EAM integrated lasers (EML) is improved for 2.5 Gbps application [7]. Using a “L” type microstrip line, the impedance matching of an EML is realized for frequencies above 10 GHz [6].…”

Electro-Absorption Modulator Integrated Lasers With Enhanced Signal Injection Efficiency

“…In fact, this is a large value (a difference of approximately 33%) considering the physical size of the EAM, and its impact on the performance of the EAM is significant. To relief the above problem, a method (similar to that proposed in [12]) to improve the signal injection efficiency and optical performance of 10-Gb/s EMLs will be proposed in this paper. In contrast to [12], a systematic lumped-element impedance-matching network (L-network) design procedure is followed and implementation method and design equations will be presented in this paper.…”

“…To relief the above problem, a method (similar to that proposed in [12]) to improve the signal injection efficiency and optical performance of 10-Gb/s EMLs will be proposed in this paper. In contrast to [12], a systematic lumped-element impedance-matching network (L-network) design procedure is followed and implementation method and design equations will be presented in this paper. Moreover, the " " design proposed in [12] functions more like staggered-step impedance transformer or open-circuit stubs which consist of two impedance discontinuities that cause signal reflections and result in signal distortion and degraded jitter.…”

“…In contrast to [12], a systematic lumped-element impedance-matching network (L-network) design procedure is followed and implementation method and design equations will be presented in this paper. Moreover, the " " design proposed in [12] functions more like staggered-step impedance transformer or open-circuit stubs which consist of two impedance discontinuities that cause signal reflections and result in signal distortion and degraded jitter. Furthermore, using two discrete sections to introduce the required capacitance and inductance restrict the implementation to bit-rates lower than 10 Gb/s because parasitic inductance and capacitance are introduced by these sections.…”