Dual-wavelength transmission system using double micro-resonator system for EMI healthcare applications

Amiri, Iraj Sadegh; Bunruangses, M.; Chaiwong, K.; Udaiyakumar, R.; Maheswar, R.; Hindia, Mohammad Nour; Dimyati, Kaharudin; Yupapin, P.

doi:10.1007/s00542-018-4022-z

Cited by 4 publications

(1 citation statement)

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“…The presence of bandwidth limitation and nonlinearity is not unique to the coherent optical transponder. In other types of application, such as radio over fiber [11,12] and millimeter wave band communication [13,14], the transmitter also suffers from the penalty due to bandwidth limitation and nonlinearity. Thus, the novel method demonstrated in this paper can be adopted, modified, and applied to different types of communication systems.…”

Section: Introductionmentioning

confidence: 99%

Compensation of Limited Bandwidth and Nonlinearity for Coherent Transponder

2019

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Coherent optical transponders are widely deployed in today’s long haul and metro optical networks using dense wavelength division multiplexing. To increase the data carrying capacity, the coherent transponder utilizes the high order modulation format and operates at a high baud rate. The limited bandwidth and the nonlinearity are two critical impairments for the coherent in-phase quadrature transmitter. These impairments can be mitigated by digital filters. However, to accurately determine the coefficients of these filters is difficult because the impairment from the limited bandwidth and the impairment from nonlinearity are coupled together. In this paper, we present a novel method to solve this problem. During the initial power-up, we apply a sinusoidal stimulus to the coherent IQ transmitter. We then scan the frequency and amplitude of the stimulus and monitor the output power. By curve-fitting with an accurate mathematical model, we determine the limited bandwidth, the nonlinearity, the power imbalance, and the bias point of the transponder simultaneously. Optimized coefficients of the digital filters are determined accordingly. Furthermore, we utilize a coherent IQ transponder and demonstrate that the limited bandwidth is improved by the finite impulse response filter, while nonlinearity is mitigated by the memoryless Volterra filter.

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Section: Introductionmentioning

confidence: 99%