Delay lines based on left-handed transmission line structure

Abstract

Delay lines based on the left‐handed transmission line (LH‐TL) structure are designed and fabricated. Comparisons of the simulation and experimental results demonstrate validity of the present design. It can be found that the LH‐TL time delay lines possess higher delay efficiency and more compactness than the traditional ones consisting of the right‐handed transmission line (RH‐TL). © 2006 Wiley Periodicals, Inc. Micorwave Opt Technol Lett 48: 1998–2001, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21836

40 Gbit/s on-off-keyed system with 5.71 GHz clock recovery circuit using duty cycle division multiplexing

“…Seven sampling circuits are synchronized with the edge detected signals. By putting an appropriate delay lines [25] for each of the sampler as shown in Fig. 1 (c), the first, second, …, and seventh sampler (S1, S2, …, and S7) take samples at T s /16, 3T s /16, …, and 13T s /16 s per symbol respectively.…”

70-Gb/s amplitude-shift-keyed system with 10-GHz clock recovery circuit using duty cycle division multiplexing

“…The n numbers of sampling circuits are synchronized with the recovered clock. By putting an appropriate delay lines [25] for each of the sampler as shown in Fig. 1b, the 1st, 2nd, …, and nth sampler (S1, S2, …, and Sn) take samples at T s /(2n + 2), 3T s / (2n + 2), …, and (2n − 1)T s /(2n + 2) s per symbol, respectively.…”

Design of a 5‐bit time delay module with left‐handed and right‐handed transmission line

“…Here the time delay lines of 400, 800, and 1600 ps are designed based on LH-TL structures. The detailed considerations of design of LH-TL delay lines to realize time delays of 400, 800, and 1600 ps were proposed in [5]. Figure 3 shows the structures of 400, 800, and 1600 ps LH-LT time delay lines, and Figure 4 shows their phase responses versus frequency, respectively.…”

“…Because of the sharp relationship between Ang(S21) of left-handed transmission lines (LH-TLs) versus frequency, LH-TLs have shown their superiority to right-handed transmission lines (RH-TLs) in the application of large true time delay. Recent work has demonstrated the characteristics of low loss and compactness of LH-TLs [5][6][7].…”

“…However, the operating wavelengths of the L-band EDFAs are very far from the peak emission band of Er 3ϩ ion, the amplifiers are relatively inefficient. To improve gain characteristics, the ED-FAs by reflection scheme [2,3], or by partial amplified spontaneous emission (ASE) was feedback into the EDF causing a gain increment in the L-band [4], or by recycling unused ASE into under pumped EDF regions [5] have been suggested and experimentally verified. Although there are many techniques began to be employed in L-band system, the comparison of one-stage and two-stage in single pumping scheme EDFA for achieving highpower low-noise- figure characteristics have not yet been reported.…”