We study stability and spectral purity of a microresonator-based Kerr frequency comb oscillator experimentally and observe a correlation between the frequency of the continuous wave laser pumping the nonlinear resonator and the repetition frequency of the comb. This correlation is used in a proof-of-principle demonstration of a Kerr frequency comb stabilized with an optical transition of 87Rb.
A quality factor exceeding 5x10(9) is obtained in whispering-gallery mode (WGM) resonators fabricated of crystalline quartz. We observe significant electrical tunability of WGMs in x-cut resonators and demonstrate an electro-optic modulator with a submegahertz passband at 12 GHz. We discuss other photonics applications of the crystal quartz WGM resonators in narrowband agile tunable filters, compact narrow linewidth lasers, and microwave and millimeter wave oscillators.
High performance, compact planar lightwave circuit based triplexers have been built and tested. The triplexers utilize lasers, photodiodes and filters that have been adapted to enable passive optical assembly of the triplexer, 02005 Optical Society o f America OCIS codes: (130.3120) integrated optics devices (230.0250) optoelectronics '
IntroductionPassive optical networks (PONS) are beginning to be mass deployed in high speed Fiber to the Home (FTTH) access networks. These networks utilize bidirectionaI optical modules that allow downstream and upstream traffic to share a single fiber. In the case where voice, data, and video services are provided on the access network, the optical module on the subscriber side is a triplexer that has two downstream receivers and one upstream laser. The most widely used waveIength plan uses the band from 1550-1560 nm for downstream video, 1480-1500 nm for downstream data, and 1260-1360 nm for upstream data. A triplexer typically consists of a data photodiode and transimpedance amp, a video photodiode, a 13 10 nm band laser and monitor photodiode, and WDM filters to separate the various optical wavelengths. Proper operation of the triplexer requires a high level of optical isolation from the WDM filters as well as effective suppression of stray light. Because every subscriber has a triplexer as part of the Optical Network Termination (ONT) equipment, cost is also an extremely important parameter for triplexers.In this paper we describe a pIanar lightwave circuit (PLC) based triplexer that achieves high levels of performance fiom a compact design that is built entirely using passive optical assembly methods.
Planar Lightwave Circuit Triplexer Design
. .A PLC based optical triplexer can be viewed as being built from five distinct functional elements. The optical waveguide network provides optical connectivity between the other main elements. The remaining four elements are the Iaser, PDs (3 per triplexer), the WDM filters (two per triplexer), and the optical fiber. A challenge in designing a PLC based ttiplexer is the design of the interfaces between the optical waveguides and these other elements. In this section, we describe ow designs for the key elements and the interfaces. The optical waveguide network used in the triplexer is primarily based on silica waveguides formed on a silicon substrate [ 1 ,a]. The Filter yA Laser Data. PD MPD
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