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	  <link:definition>0023 - Disclosure - O. SEGMENT AND GEOGRAPHIC INFORMATION</link:definition>
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	  <link:definition>0026 - Disclosure - R. COMMITMENTS AND CONTINGENCIES</link:definition>
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	  <link:definition>0027 - Disclosure - S. RELATED PARTY TRANSACTIONS</link:definition>
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	  <link:definition>0028 - Disclosure - T. SUBSEQUENT EVENTS</link:definition>
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	  <link:definition>0029 - Disclosure - U. SELECTED QUARTERLY FINANCIAL DATA</link:definition>
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	  <link:definition>0030 - Disclosure - B. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)</link:definition>
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	  <link:definition>0031 - Disclosure - B. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)</link:definition>
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	  <link:definition>0032 - Disclosure - C. EARNINGS PER SHARE (Tables)</link:definition>
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	  <link:definition>0033 - Disclosure - D. INVENTORIES (Tables)</link:definition>
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	  <link:definition>0034 - Disclosure - E. PROPERTY, PLANT AND EQUIPMENT (Tables)</link:definition>
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	  <link:definition>0035 - Disclosure - F. INTANGIBLE ASSETS (Tables)</link:definition>
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	  <link:definition>0036 - Disclosure - G. FAIR VALUE OF FINANCIAL INSTRUMENTS (Tables)</link:definition>
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	  <link:definition>0037 - Disclosure - H. NOTES PAYABLE AND LONG-TERM DEBT (Tables)</link:definition>
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	  <link:definition>0038 - Disclosure - J. ACCRUED LIABILITIES (Tables)</link:definition>
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	  <link:definition>0039 - Disclosure - K. OTHER INCOME AND EXPENSE (Tables)</link:definition>
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	  <link:definition>0040 - Disclosure - L. INCOME TAXES (Tables)</link:definition>
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	  <link:definition>0041 - Disclosure - M. SHARE-BASED COMPENSATION (Tables)</link:definition>
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	  <link:definition>0044 - Disclosure - S. RELATED PARTY TRANSACTIONS (Tables)</link:definition>
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	  <link:definition>0045 - Disclosure - U. SELECTED QUARTERLY FINANCIAL DATA (Tables)</link:definition>
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	  <link:definition>0046 - Disclosure - B. Summary Of Significant Accounting Policies (Details)</link:definition>
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	  <link:definition>0047 - Disclosure - B. Summary Of Significant Accounting Policies (Narrative)</link:definition>
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	  <link:definition>0048 - Disclosure - C. Earnings Per Share (Details-Calculation EPS)</link:definition>
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	  <link:usedOn>link:calculationLink</link:usedOn>
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	  <link:definition>0049 - Disclosure - C. Earnings Per Share (Details-Potentially Dilutive Shares)</link:definition>
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	  <link:usedOn>link:calculationLink</link:usedOn>
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	<link:roleType roleURI="http://ao-inc.com/role/D.InventoryDetails" id="D.InventoryDetails">
	  <link:definition>0050 - Disclosure - D. Inventory (Details)</link:definition>
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	  <link:definition>0051 - Disclosure - D. Inventory (Narrative)</link:definition>
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	<link:roleType roleURI="http://ao-inc.com/role/E.PropertyPlantAndEquipmentDetails" id="E.PropertyPlantAndEquipmentDetails">
	  <link:definition>0052 - Disclosure - E. Property, Plant and Equipment (Details)</link:definition>
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	  <link:usedOn>link:calculationLink</link:usedOn>
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	<link:roleType roleURI="http://ao-inc.com/role/E.PropertyPlantAndEquipmentNarrative" id="E.PropertyPlantAndEquipmentNarrative">
	  <link:definition>0053 - Disclosure - E. Property, Plant and Equipment (Narrative)</link:definition>
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	  <link:definition>0054 - Disclosure - F. Intangible Assets (Details)</link:definition>
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	  <link:definition>0055 - Disclosure - F. Intangible Assets (Details-Amortization Schedule)</link:definition>
	  <link:usedOn>link:presentationLink</link:usedOn>
	  <link:usedOn>link:calculationLink</link:usedOn>
	  <link:usedOn>link:definitionLink</link:usedOn>
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	<link:roleType roleURI="http://ao-inc.com/role/F.IntangibleAssetsNarrative" id="F.IntangibleAssetsNarrative">
	  <link:definition>0056 - Disclosure - F. Intangible Assets (Narrative)</link:definition>
	  <link:usedOn>link:presentationLink</link:usedOn>
	  <link:usedOn>link:calculationLink</link:usedOn>
	  <link:usedOn>link:definitionLink</link:usedOn>
	</link:roleType>
	<link:roleType roleURI="http://ao-inc.com/role/G.FairValueOfFinancialInstrumentsDetails-Summary" id="G.FairValueOfFinancialInstrumentsDetails-Summary">
	  <link:definition>0057 - Disclosure - G. Fair Value of Financial Instruments (Details-Summary)</link:definition>
	  <link:usedOn>link:presentationLink</link:usedOn>
	  <link:usedOn>link:calculationLink</link:usedOn>
	  <link:usedOn>link:definitionLink</link:usedOn>
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	<link:roleType roleURI="http://ao-inc.com/role/H.NotesPayableAndLong-TermDebtDetails-ScheduleOfDebt" id="H.NotesPayableAndLong-TermDebtDetails-ScheduleOfDebt">
	  <link:definition>0058 - Disclosure - H. Notes Payable and Long-Term Debt (Details-Schedule of Debt)</link:definition>
	  <link:usedOn>link:presentationLink</link:usedOn>
	  <link:usedOn>link:calculationLink</link:usedOn>
	  <link:usedOn>link:definitionLink</link:usedOn>
	</link:roleType>
	<link:roleType roleURI="http://ao-inc.com/role/H.NotesPayableAndLong-TermDebtDetails-Maturities" id="H.NotesPayableAndLong-TermDebtDetails-Maturities">
	  <link:definition>0059 - Disclosure - H. Notes Payable and Long-Term Debt (Details-Maturities)</link:definition>
	  <link:usedOn>link:presentationLink</link:usedOn>
	  <link:usedOn>link:calculationLink</link:usedOn>
	  <link:usedOn>link:definitionLink</link:usedOn>
	</link:roleType>
	<link:roleType roleURI="http://ao-inc.com/role/H.NotesPayableAndLong-TermDebtNarrative" id="H.NotesPayableAndLong-TermDebtNarrative">
	  <link:definition>0060 - Disclosure - H. Notes Payable and Long-Term Debt (Narrative)</link:definition>
	  <link:usedOn>link:presentationLink</link:usedOn>
	  <link:usedOn>link:calculationLink</link:usedOn>
	  <link:usedOn>link:definitionLink</link:usedOn>
	</link:roleType>
	<link:roleType roleURI="http://ao-inc.com/role/I.Short-TermLoanWithShareholdersNarrative" id="I.Short-TermLoanWithShareholdersNarrative">
	  <link:definition>0061 - Disclosure - I. Short-Term Loan With Shareholders (Narrative)</link:definition>
	  <link:usedOn>link:presentationLink</link:usedOn>
	  <link:usedOn>link:calculationLink</link:usedOn>
	  <link:usedOn>link:definitionLink</link:usedOn>
	</link:roleType>
	<link:roleType roleURI="http://ao-inc.com/role/J.AccruedLiabilitiesDetails" id="J.AccruedLiabilitiesDetails">
	  <link:definition>0062 - Disclosure - J. Accrued Liabilities (Details)</link:definition>
	  <link:usedOn>link:presentationLink</link:usedOn>
	  <link:usedOn>link:calculationLink</link:usedOn>
	  <link:usedOn>link:definitionLink</link:usedOn>
	</link:roleType>
	<link:roleType roleURI="http://ao-inc.com/role/K.OtherIncomeAndExpenseDetails" id="K.OtherIncomeAndExpenseDetails">
	  <link:definition>0063 - Disclosure - K. Other Income and Expense (Details)</link:definition>
	  <link:usedOn>link:presentationLink</link:usedOn>
	  <link:usedOn>link:calculationLink</link:usedOn>
	  <link:usedOn>link:definitionLink</link:usedOn>
	</link:roleType>
	<link:roleType roleURI="http://ao-inc.com/role/L.IncomeTaxesDetails-OperationsIncome" id="L.IncomeTaxesDetails-OperationsIncome">
	  <link:definition>0064 - Disclosure - L. Income Taxes (Details-Operations Income)</link:definition>
	  <link:usedOn>link:presentationLink</link:usedOn>
	  <link:usedOn>link:calculationLink</link:usedOn>
	  <link:usedOn>link:definitionLink</link:usedOn>
	</link:roleType>
	<link:roleType roleURI="http://ao-inc.com/role/L.IncomeTaxesDetails-DeferredIncomeTaxes" id="L.IncomeTaxesDetails-DeferredIncomeTaxes">
	  <link:definition>0065 - Disclosure - L. Income Taxes (Details-Deferred Income Taxes)</link:definition>
	  <link:usedOn>link:presentationLink</link:usedOn>
	  <link:usedOn>link:calculationLink</link:usedOn>
	  <link:usedOn>link:definitionLink</link:usedOn>
	</link:roleType>
	<link:roleType roleURI="http://ao-inc.com/role/L.IncomeTaxesDetails-Reconciliation" id="L.IncomeTaxesDetails-Reconciliation">
	  <link:definition>0066 - Disclosure - L. Income Taxes (Details-Reconciliation)</link:definition>
	  <link:usedOn>link:presentationLink</link:usedOn>
	  <link:usedOn>link:calculationLink</link:usedOn>
	  <link:usedOn>link:definitionLink</link:usedOn>
	</link:roleType>
	<link:roleType roleURI="http://ao-inc.com/role/L.IncomeTaxesNarrative" id="L.IncomeTaxesNarrative">
	  <link:definition>0067 - Disclosure - L. Income Taxes (Narrative)</link:definition>
	  <link:usedOn>link:presentationLink</link:usedOn>
	  <link:usedOn>link:calculationLink</link:usedOn>
	  <link:usedOn>link:definitionLink</link:usedOn>
	</link:roleType>
	<link:roleType roleURI="http://ao-inc.com/role/M.Share-BasedCompensationDetails-Assumptions" id="M.Share-BasedCompensationDetails-Assumptions">
	  <link:definition>0068 - Disclosure - M. Share-Based Compensation (Details-Assumptions)</link:definition>
	  <link:usedOn>link:presentationLink</link:usedOn>
	  <link:usedOn>link:calculationLink</link:usedOn>
	  <link:usedOn>link:definitionLink</link:usedOn>
	</link:roleType>
	<link:roleType roleURI="http://ao-inc.com/role/M.Share-BasedCompensationDetails-Share-BasedCompensation" id="M.Share-BasedCompensationDetails-Share-BasedCompensation">
	  <link:definition>0069 - Disclosure - M. Share-Based Compensation (Details-Share-based Compensation)</link:definition>
	  <link:usedOn>link:presentationLink</link:usedOn>
	  <link:usedOn>link:calculationLink</link:usedOn>
	  <link:usedOn>link:definitionLink</link:usedOn>
	</link:roleType>
	<link:roleType roleURI="http://ao-inc.com/role/M.Share-BasedCompensationDetails-OptionActivity" id="M.Share-BasedCompensationDetails-OptionActivity">
	  <link:definition>0070 - Disclosure - M. Share-Based Compensation (Details-Option Activity)</link:definition>
	  <link:usedOn>link:presentationLink</link:usedOn>
	  <link:usedOn>link:calculationLink</link:usedOn>
	  <link:usedOn>link:definitionLink</link:usedOn>
	</link:roleType>
	<link:roleType roleURI="http://ao-inc.com/role/M.Share-BasedCompensationDetails-MinimumAndMaximum" id="M.Share-BasedCompensationDetails-MinimumAndMaximum">
	  <link:definition>0071 - Disclosure - M. Share-Based Compensation (Details-Minimum and Maximum)</link:definition>
	  <link:usedOn>link:presentationLink</link:usedOn>
	  <link:usedOn>link:calculationLink</link:usedOn>
	  <link:usedOn>link:definitionLink</link:usedOn>
	</link:roleType>
	<link:roleType roleURI="http://ao-inc.com/role/M.Share-BasedCompensationDetails-OptionsSummary" id="M.Share-BasedCompensationDetails-OptionsSummary">
	  <link:definition>0072 - Disclosure - M. Share-Based Compensation (Details-Options Summary)</link:definition>
	  <link:usedOn>link:presentationLink</link:usedOn>
	  <link:usedOn>link:calculationLink</link:usedOn>
	  <link:usedOn>link:definitionLink</link:usedOn>
	</link:roleType>
	<link:roleType roleURI="http://ao-inc.com/role/M.Share-BasedCompensationDetails-OptionsGranted" id="M.Share-BasedCompensationDetails-OptionsGranted">
	  <link:definition>0073 - Disclosure - M. Share-Based Compensation (Details-Options Granted)</link:definition>
	  <link:usedOn>link:presentationLink</link:usedOn>
	  <link:usedOn>link:calculationLink</link:usedOn>
	  <link:usedOn>link:definitionLink</link:usedOn>
	</link:roleType>
	<link:roleType roleURI="http://ao-inc.com/role/M.Stock-BasedCompensationNarrative" id="M.Stock-BasedCompensationNarrative">
	  <link:definition>0074 - Disclosure - M. Stock-Based Compensation (Narrative)</link:definition>
	  <link:usedOn>link:presentationLink</link:usedOn>
	  <link:usedOn>link:calculationLink</link:usedOn>
	  <link:usedOn>link:definitionLink</link:usedOn>
	</link:roleType>
	<link:roleType roleURI="http://ao-inc.com/role/N.StockholdersEquityNarrative" id="N.StockholdersEquityNarrative">
	  <link:definition>0075 - Disclosure - N. Stockholders Equity (Narrative)</link:definition>
	  <link:usedOn>link:presentationLink</link:usedOn>
	  <link:usedOn>link:calculationLink</link:usedOn>
	  <link:usedOn>link:definitionLink</link:usedOn>
	</link:roleType>
	<link:roleType roleURI="http://ao-inc.com/role/O.SegmentAndGeographicInformationDetails" id="O.SegmentAndGeographicInformationDetails">
	  <link:definition>0076 - Disclosure - O. Segment And Geographic Information (Details)</link:definition>
	  <link:usedOn>link:presentationLink</link:usedOn>
	  <link:usedOn>link:calculationLink</link:usedOn>
	  <link:usedOn>link:definitionLink</link:usedOn>
	</link:roleType>
	<link:roleType roleURI="http://ao-inc.com/role/O.SegmentAndGeographicInformationNarrative" id="O.SegmentAndGeographicInformationNarrative">
	  <link:definition>0077 - Disclosure - O. Segment And Geographic Information (Narrative)</link:definition>
	  <link:usedOn>link:presentationLink</link:usedOn>
	  <link:usedOn>link:calculationLink</link:usedOn>
	  <link:usedOn>link:definitionLink</link:usedOn>
	</link:roleType>
	<link:roleType roleURI="http://ao-inc.com/role/P.MajorCustomersNarrative" id="P.MajorCustomersNarrative">
	  <link:definition>0078 - Disclosure - P. Major Customers (Narrative)</link:definition>
	  <link:usedOn>link:presentationLink</link:usedOn>
	  <link:usedOn>link:calculationLink</link:usedOn>
	  <link:usedOn>link:definitionLink</link:usedOn>
	</link:roleType>
	<link:roleType roleURI="http://ao-inc.com/role/Q.EmployeeBenefitPlansNarrative" id="Q.EmployeeBenefitPlansNarrative">
	  <link:definition>0079 - Disclosure - Q. Employee Benefit Plans (Narrative)</link:definition>
	  <link:usedOn>link:presentationLink</link:usedOn>
	  <link:usedOn>link:calculationLink</link:usedOn>
	  <link:usedOn>link:definitionLink</link:usedOn>
	</link:roleType>
	<link:roleType roleURI="http://ao-inc.com/role/R.CommitmentsAndContingenciesDetails" id="R.CommitmentsAndContingenciesDetails">
	  <link:definition>0080 - Disclosure - R. Commitments And Contingencies (Details)</link:definition>
	  <link:usedOn>link:presentationLink</link:usedOn>
	  <link:usedOn>link:calculationLink</link:usedOn>
	  <link:usedOn>link:definitionLink</link:usedOn>
	</link:roleType>
	<link:roleType roleURI="http://ao-inc.com/role/R.CommitmentsAndContingenciesNarrative" id="R.CommitmentsAndContingenciesNarrative">
	  <link:definition>0081 - Disclosure - R. Commitments And Contingencies (Narrative)</link:definition>
	  <link:usedOn>link:presentationLink</link:usedOn>
	  <link:usedOn>link:calculationLink</link:usedOn>
	  <link:usedOn>link:definitionLink</link:usedOn>
	</link:roleType>
	<link:roleType roleURI="http://ao-inc.com/role/S.RelatedPartyTransactionsDetails" id="S.RelatedPartyTransactionsDetails">
	  <link:definition>0082 - Disclosure - S. Related Party Transactions (Details)</link:definition>
	  <link:usedOn>link:presentationLink</link:usedOn>
	  <link:usedOn>link:calculationLink</link:usedOn>
	  <link:usedOn>link:definitionLink</link:usedOn>
	</link:roleType>
	<link:roleType roleURI="http://ao-inc.com/role/U.SelectedQuarterlyFinancialDataDetails" id="U.SelectedQuarterlyFinancialDataDetails">
	  <link:definition>0083 - Disclosure - U. Selected Quarterly Financial Data (Details)</link:definition>
	  <link:usedOn>link:presentationLink</link:usedOn>
	  <link:usedOn>link:calculationLink</link:usedOn>
	  <link:usedOn>link:definitionLink</link:usedOn>
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	<link:linkbaseRef xlink:type="simple" xlink:href="aaoi-20131231_pre.xml" xlink:role="http://www.xbrl.org/2003/role/presentationLinkbaseRef" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:title="Presentation Links" />
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	<link:linkbaseRef xlink:type="simple" xlink:href="aaoi-20131231_cal.xml" xlink:role="http://www.xbrl.org/2003/role/calculationLinkbaseRef" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:title="Calculation Links" />
	<link:linkbaseRef xlink:type="simple" xlink:href="aaoi-20131231_def.xml" xlink:role="http://www.xbrl.org/2003/role/definitionLinkbaseRef" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:title="Definition Links" />
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    <element id="AAOI_ReverseStockSplitPolicyTextBlock" name="ReverseStockSplitPolicyTextBlock" nillable="true" xbrli:periodType="duration" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" />
    <element id="AAOI_IntangibleAssetsTableTextBlock" name="IntangibleAssetsTableTextBlock" nillable="true" xbrli:periodType="duration" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" />
    <element id="AAOI_MaturitiesOfNotesPayableAndLongtermDebtTableTextBlock" name="MaturitiesOfNotesPayableAndLongtermDebtTableTextBlock" nillable="true" xbrli:periodType="duration" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" />
    <element id="AAOI_PledgedCertificateOfDepositForLineOfCredit" name="PledgedCertificateOfDepositForLineOfCredit" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="AAOI_NumeratorAbstract" name="NumeratorAbstract" nillable="true" xbrli:periodType="duration" type="xbrli:stringItemType" substitutionGroup="xbrli:item" />
    <element id="AAOI_DenominatorAbstract" name="DenominatorAbstract" nillable="true" xbrli:periodType="duration" type="xbrli:stringItemType" substitutionGroup="xbrli:item" />
    <element id="AAOI_WeightedAverageSharesUsedToComputeNetIncomeLossPerShareAbstract" name="WeightedAverageSharesUsedToComputeNetIncomeLossPerShareAbstract" abstract="true" nillable="true" xbrli:periodType="duration" type="xbrli:stringItemType" substitutionGroup="xbrli:item" />
    <element id="AAOI_NetIncomeLossPerShare" name="NetIncomeLossPerShare" abstract="true" nillable="true" xbrli:periodType="duration" type="xbrli:stringItemType" substitutionGroup="xbrli:item" />
    <element id="AAOI_RestrictedCashAndCashEquivalentsFairValueDisclosure" name="RestrictedCashAndCashEquivalentsFairValueDisclosure" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="AAOI_CurrencyDomain" name="CurrencyDomain" abstract="true" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
    <element id="AAOI_AccruedPayments" name="AccruedPayments" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="AAOI_AccruedCommission" name="AccruedCommission" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="AAOI_GovernmentSubsidyIncome" name="GovernmentSubsidyIncome" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="AAOI_FairValueAssumptionsEstimatedForfeituresRate" name="FairValueAssumptionsEstimatedForfeituresRate" nillable="true" xbrli:periodType="duration" type="num:percentItemType" substitutionGroup="xbrli:item" />
    <element id="AAOI_NumberOfShares" name="NumberOfShares" abstract="true" nillable="true" xbrli:periodType="duration" type="xbrli:stringItemType" substitutionGroup="xbrli:item" />
    <element id="AAOI_ExercisePrice" name="ExercisePrice" abstract="true" nillable="true" xbrli:periodType="duration" type="xbrli:stringItemType" substitutionGroup="xbrli:item" />
    <element id="AAOI_M.SharebasedCompensationDetailsminimumAndMaximumAbstract" name="M.SharebasedCompensationDetailsminimumAndMaximumAbstract" abstract="true" nillable="true" xbrli:periodType="duration" type="xbrli:stringItemType" substitutionGroup="xbrli:item" />
    <element id="AAOI_WarrantsExercisedForCommonStockShares" name="WarrantsExercisedForCommonStockShares" nillable="true" xbrli:periodType="duration" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" />
    <element id="AAOI_SalesRevenueGoodsPercentage" name="SalesRevenueGoodsPercentage" nillable="true" xbrli:periodType="instant" type="num:percentItemType" substitutionGroup="xbrli:item" />
    <element id="AAOI_ConsultingServiceFees" name="ConsultingServiceFees" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="AAOI_InterestPayableRelatedParty" name="InterestPayableRelatedParty" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="AAOI_GrossMargin" name="GrossMargin" nillable="true" xbrli:periodType="duration" type="num:percentItemType" substitutionGroup="xbrli:item" />
    <element id="AAOI_WeightedAverageSharesUsedToComputeNetLossPerShareAsRevised" name="WeightedAverageSharesUsedToComputeNetLossPerShareAsRevised" abstract="true" nillable="true" xbrli:periodType="duration" type="xbrli:stringItemType" substitutionGroup="xbrli:item" />
</schema>
