Multimode interference couplers with tunable power splitting ratios

Leuthold, Juerg; Joyner, C.W.

doi:10.1109/50.923483

Cited by 135 publications

(70 citation statements)

References 23 publications

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“…3(c) shows the Middle Section of the OPLL-PIC. The 2x2 MMI in this section can be tuned by current injection [31], [32], although we have not done it in this work. The modulator and photodetector at the output of the 2x2 MMI connect to RF pads that are arranged in a G-S-G-S-G-S-G configuration for direct probing, with 150 µm pitch and 100 µm x 100 µm surface area per pad.…”

Section: B Opll-pic Designmentioning

confidence: 99%

Phase-Locked Optical Generation of mmW/THz Signals

Johansson¹,

Coldren²,

Rodwell³

2009

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The public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing this burden, to Department of Defense, Washington Headquarters Services, Directorate for Information , 1215 Jefferson Davis Highway, Suite 1204, Arlington, VA 22202-4302. Respondents should be aware that notwithstanding any other provision of law, no person shall be subject to any penalty for failing to comply with a collection of information if it does not display a currently valid OMB control number. PLEASE DO NOT RETURN YOUR FORM TO THE ABOVE ADDRESS. REPORT DATE (DD-MM-YY)2. REPORT TYPE 3. DATES COVERED (From -To) SPONSORING/MONITORING AGENCY REPORT NUMBER(S) AFRL-RY-WP-TR-2010-1073 DISTRIBUTION/AVAILABILITY STATEMENTApproved for public release; distribution unlimited. PAO Case Number: 88ABW 2010-1316 Clearance Date: 19 March 2010. This report contains color. SUPPLEMENTARY NOTES ABSTRACTIn this report, an effort to demonstrate a highly efficient millimeter-wave (mmW) modulated optical source is summarized. This is achieved using an integrated heterodyne optical phase-locked loop (OPLL) built from monolithically integrated photonic and electronic circuits (ICs). The close integration of these ICs enables low feedback latency so that relatively wide linewidth semiconductor lasers can be used. This demonstration is a key step toward realizing compact practical OPLL mmW sources incorporating data modulation. The heterodyne frequency is ultimately limited by photodetector bandwidths, and the data rate is limited by the heterodyne frequency. It will be shown that the overall performance of the heterodyne OPLL is sufficient to demonstrate the feasibility of and a direct path towards multilevel modulation at 100Gbps data rates of a mmW carrier frequency in the 100GHz to 300GHz range. This successful demonstration of the OPLL heterodyne source is a critical demonstration required to allow electronic and photonic components, now developed for advanced future fiber optic communications systems, to be directly adopted for high capacity optical feeds to enable 100Gbps wireless links. SUBJECT TERMSOptical Phase-Locked Loop (OPLL), Integrated Circuits (IC), Millimeter Waves (mmW), Terahertz (THz) SUMMARYIn t his r eport a n ew s eedling ef fort to d emonstrate a h ighly e fficient millime ter-wave ( MMW) modulated optical source is summarized. This is achieved using an integrated heterodyne optical phase-lock loop (OPLL) built from monolithically integrated photonic and electronic ICs. T he close integration of t hese ICs enables low f eedback la tency s o th at r elatively w ide lin ewidth semiconductor lasers can be used. This demonstration is key to show a direct path to compact practical O PLL m...

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Section: B Opll-pic Designmentioning

confidence: 99%

Phase-Locked Optical Generation of mmW/THz Signals

Johansson¹,

Coldren²,

Rodwell³

2009

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“…40,41 After that, several photonic switches have been proposed using the IM inside the MMI section to modify the phase relation between the self-images. 9,37,[42][43][44][45][46][47] The switching mechanism of all these switches is the same-they operate by modifying the refractive index at specific areas within the MMI waveguide, which are collocated with the occurrence of multiple self-images. This change in the refractive index effectively alters the phase relation between the selfimages, which ultimately modifies the output image and switches the light between the output waveguides.…”

Section: Image-modulated MMI Switchmentioning

confidence: 99%

Multimode interference photonic switches

et al. 2008

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Abstract. Photonic switches are becoming key components in advanced optical networks due to their various applications in optical communication. One of the key advantages of photonic switches is the fact that they redirect or convert light without any optical to electronic conversions and vice versa. As one type of optical switch, multimode interference ͑MMI͒ switches have received more attention in recent years due to their significant role. The structure and operation principle of various types of MMI switches are introduced, and the recent progresses of MMI switches are also discussed.

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“…To reduce power loss, we take advantage a variance of the SaD switch by using configurable optical splitters [20], shown in Fig. 2(a).…”

Section: Node Architecturementioning

confidence: 99%

Multicast traffic grooming in wavelength-routed WDM mesh networks using dynamically changing light-trees

Huang

Farahmand

Jue

2005

J. Lightwave Technol.

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Abstract-In this paper, we address the online multicast traffic grooming problem in wavelength-routed wavelength division multiplexing (WDM) mesh networks with sparse grooming capability. We develop a multicast dynamic light-tree grooming algorithm (MDTGA) that can support multihop traffic grooming by taking advantage of light-trees. In this algorithm, a light-tree can be dropped, branched, and extended when a route is to be established for a new request; a light-tree can also be contracted when some branches carry no effective traffic after requests depart from the network. The difficulty of the algorithm lies in the dynamic characteristic of light-trees. We implement MDTGA on a new auxiliary-graph model. For the purpose of comparison, we also implement a lightpath-based grooming algorithm by putting a constraint on the optical-splitting capability of the nodes. Through extensive simulations, we find that MDTGA has much better performance than the lightpath-based algorithm.

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Multimode interference couplers with tunable power splitting ratios

Cited by 135 publications

References 23 publications

Phase-Locked Optical Generation of mmW/THz Signals

Phase-Locked Optical Generation of mmW/THz Signals

Multimode interference photonic switches

Multicast traffic grooming in wavelength-routed WDM mesh networks using dynamically changing light-trees

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