Normal dispersion frequency comb

• US 9,048,625 B2
• Filed: 07/29/2014
• Issued: 06/02/2015
• Est. Priority Date: 07/29/2013
• Status: Expired due to Fees

• Current Assignee: Trustees Of Columbia University In The City Of New York (Columbia University)
• Original Assignee: Trustees Of Columbia University In The City Of New York (Columbia University)
• Inventors: Zhou, Heng, Huang, Shu-Wei, Wong, Chee Wei
• Primary Examiner(s): NGUYEN, TUAN N
• Application Number:
  US14/445,959
• Publication Number:
  US 20150030040A1
• Time in Patent Office: 308 Days
• Field of Search: 372/18
• US Class Current: 1/1
• CPC Class Codes: G01J 3/457 Correlation spectrometry, e.g. of the intensity G01J3/453 takes precedence
• CPC Class Codes: G02F 1/35 Non-linear optics
• CPC Class Codes: G02F 2203/56 Frequency comb synthesizer
• CPC Class Codes: H01S 3/08013 Resonator comprising a fibre, e.g. for modifying dispersion or repetition rate the active medium being a fibre H01S3/067
• CPC Class Codes: H01S 3/1106 Mode locking

Abstract

Normal group velocity dispersion mode-locked optical frequency combs are provided on-chip. On-chip coherent frequency comb generation includes pulses showing temporal durations of about 74 fs. Pump detuning and bandpass filtering are provided for stabilizing and shaping the pulses from normal group velocity dispersion microresonators.

Claims

1. An apparatus for generating a frequency comb comprising:

a continuous wave pump coupled to a microring resonator, the microring resonator configured to emit a mode-locking frequency comb by normal dispersion, wherein;

the mode-locking frequency comb is coherent;

the mode-locking frequency comb comprises at least about 200 mode-locked modes; and

the mode-locking frequency comb has a repetition rate of about 108 GHz to about 116 GHz.

2. The apparatus of claim 1, wherein the microring resonator has a radius of about 200 μ

m, a cross-sectional width of about 2 μ

m and a cross-sectional height of about 0.725 μ

m.

3. The apparatus of claim 1, wherein the microring resonator comprises silicon nitride.

4. The apparatus of claim 1, wherein the microring resonator is configured to emit an optical pulse of about 74 femtoseconds.

5. The apparatus of claim 1, further comprising a spectral filter coupled to an output of the microring resonator.

6. The apparatus of claim 5, wherein the spectral filter comprises a bandpass filter.

7. The apparatus of claim 1, wherein the mode-locking frequency comb comprises at least about 300 mode-locked modes.

8. The apparatus of claim 1, wherein the mode-locking frequency comb comprises at least about 400 mode-locked modes.

9. The apparatus of claim 1, wherein the mode-locking frequency comb has a span of at least about 200 nm.