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Chinese Optics Letters

Chinese Optics Letters

| PUBLISHED MONTHLY BY CHINESE LASER PRESS AND DISTRIBUTED BY OSA

  • Vol. 2, Iss. 1 — Jan. 10, 2004
  • pp: 15–17

A high performance tunable optical filter based on cascaded polarization interference filter

Zongfu Hu  »View Author Affiliations


Chinese Optics Letters, Vol. 2, Issue 1, pp. 15-17 (2004)


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Abstract

A new kind of tunable optical filter is proposed for DWDM optical communication application. It is based on cascaded polarization interference filter (PIF). The period and bandpass width of each PIF are decided by its optical path difference between o-ray and e-ray (OPDOE). When their OPDOEs are proportionately designed, the tuning range and bandpass width depend on OPDOE in the first and the last PIF, respectively. The tuning range, bandpass width and crosstalk are independent each other. The crosstalk is related to the OPDOE ratios among PIFs and can be suppressed by designing the PIF's OPDOE. A set of OPDOE is suggested that are l_1, 2* l_1, 2^2* l_1, 2^3* l_1, 2^4* l_1, ..., 2^{N-4}* l_1, 15*2^{N-7}* l_1, 10*2^{N-6}* l_1 and 2^{N-2}* l_1 from the first to the last. This suggested OPDOEs can yield -50-dB crosstalk for any tuning range and bandpass width. The insert loss is less than 1 dB. As its loose alignment requirement, there is no limitation on cascaded PIF number. When 11 PIFs are cascaded, it can achieve 170-nm tuning range, -50-dB crosstalk, bandpass width applicable to 25-GHz channel spacing and 1 dB insert loss.

© 2005 Chinese Optics Letters

OCIS Codes
(060.2330) Fiber optics and optical communications : Fiber optics communications
(120.2440) Instrumentation, measurement, and metrology : Filters

Citation
Zongfu Hu, "A high performance tunable optical filter based on cascaded polarization interference filter," Chin. Opt. Lett. 2, 15-17 (2004)
http://www.opticsinfobase.org/col/abstract.cfm?URI=col-2-1-15


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