Fiber-coupled short Fabry-Perot resonators
- AT and T Bell Labs., Holmdel, NJ (USA)
Fabry-Perot resonators intended as filters in wavelength-multiplexed optical communications systems may have to be very short (on the order of 10 {mu}m) in order to increase their free spectral range. Short, yet tunable cavities can be designed as air gaps between two fibers placed in close proximity with highly reflecting mirrors deposited on their ends. However, an air-gap resonator with plane mirrors between closely spaced fiber ends may yield low throughout because of the poor match between the modes of typical single-mode fibers and the resonant mode in the air-gap cavity. The throughput can be improved by confining the resonant mode by means of a hollow dielectric tube placed inside the resonator. This paper compares short fiber-coupled Fabry-Parot resonators with and without an inserted hollow dielectric waveguide and derives expressions for their transmission losses. The authors show that the throughput of both types of resonator can be improved significantly by using a special fiber with large mode size to couple to the resonator. The special fiber is then spliced to a conventional single-mode fiber. They conclude that the resonator with an inserted hollow dielectric waveguide offers increased throughput for resonators with high finesse.
- OSTI ID:
- 5289797
- Journal Information:
- Journal of Lightwave Technology; (USA), Journal Name: Journal of Lightwave Technology; (USA) Vol. 7:5; ISSN JLTED; ISSN 0733-8724
- Country of Publication:
- United States
- Language:
- English
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