Tunable Optical Add/Drop Multiplexers Using Cascaded Mach Zehnder Coupler
Tunable Optical Add/Drop Multiplexers Using Cascaded Mach Zehnder Coupler
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DOI：
10.1080/01468030701719080
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发表时间：
2007-12
影响因子：
1.7
通讯作者：
P. Sahu
中科院分区：
文献类型：
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作者：
P. Sahu
摘要提出了一种基于SiO2/锡永级联马赫曾德尔耦合器的可调谐分插滤波器，并给出了其数学模型。滤波宽度的增加（即，自由光谱响应）和降低该滤波器的串扰，使用其具有截断二项式耦合器分布的数学模型进行优化。对于5级（M = 9，r = 2）截断二项式CMZ滤波器，在−20 dB串扰时折射率对比度为100 GHz（0.8 nm）信道间隔的波长信道数为100 GHz（31 nm的自由光谱范围），每个MZ部分的弯曲损耗为0.1 dB。可以看出，如果在制造过程中，波导芯宽度w增加或减少0.1 μm（以百分比计为10% ±6.6%），则串扰略微增加10% ± 7%。波长通道的热调谐是由具有低功率热光延迟线结构的薄膜加热器实现的，与传统结构相比，其加热功率降低了1.58倍。
Abstract A tunable add/drop filter based on Cascaded Mach Zehnder (CMZ) coupler using SiO2/silicon oxinitride (SiON) is presented with its mathematical model. The increase of filtered width (i.e., free spectral response) and lowering of crosstalk for this filter are optimized using its mathematical model with truncated binomial coupler distribution. The number of wavelength channels with 100 GHz (0.8 nm) channel spacing for 5-stage (M = 9, r = 2) truncated binomial CMZ filter with index contrast ∼5% at −20 dB crosstalk and the bending loss of 0.1 dB per MZ section are obtained as ∼37 (free spectral range of 31 nm). It is seen that if during the fabrication process, waveguide core width w is increased or decreased by 0.1 μm (in percentage terms ∼±6.6%), the crosstalk is slightly increased by ∼7%. Thermal tuning for wavelength channels is achieved by thin film heater with low power thermooptic delay line structure which reduces the heating power by ∼1.58 times in comparison to the conventional structure.