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      <link:linkbaseRef xlink:type="simple" xlink:href="aaoi-20170331_lab.xml" xlink:title="Label Links" xlink:role="http://www.xbrl.org/2003/role/labelLinkbaseRef" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" />
    </appinfo>
  </annotation>
  <import namespace="http://www.xbrl.org/2003/instance" schemaLocation="http://www.xbrl.org/2003/xbrl-instance-2003-12-31.xsd" />
  <import namespace="http://www.xbrl.org/2003/linkbase" schemaLocation="http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd" />
  <import namespace="http://xbrl.sec.gov/dei/2014-01-31" schemaLocation="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd" />
  <import namespace="http://fasb.org/us-types/2016-01-31" schemaLocation="http://xbrl.fasb.org/us-gaap/2016/elts/us-types-2016-01-31.xsd" />
  <import namespace="http://www.xbrl.org/dtr/type/non-numeric" schemaLocation="http://www.xbrl.org/dtr/type/nonNumeric-2009-12-16.xsd" />
  <import namespace="http://www.xbrl.org/dtr/type/numeric" schemaLocation="http://www.xbrl.org/dtr/type/numeric-2009-12-16.xsd" />
  <import namespace="http://www.xbrl.org/2009/role/negated" schemaLocation="http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd" />
  <import namespace="http://fasb.org/us-gaap/2016-01-31" schemaLocation="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd" />
  <import namespace="http://xbrl.sec.gov/country/2016-01-31" schemaLocation="http://xbrl.sec.gov/country/2016/country-2016-01-31.xsd" />
  <element id="aaoi_AdvancePaymentsCurrent" name="AdvancePaymentsCurrent" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="credit" />
  <element id="aaoi_ChinaConstructionBankMember" name="ChinaConstructionBankMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" />
  <element id="aaoi_Revolving1Member" name="Revolving1Member" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" />
  <element id="aaoi_TermLoan1Member" name="TermLoan1Member" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" />
  <element id="aaoi_TermLoan2Member" name="TermLoan2Member" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" />
  <element id="aaoi_NotePayable1Member" name="NotePayable1Member" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" />
  <element id="aaoi_NotePayable2Member" name="NotePayable2Member" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" />
  <element id="aaoi_TermLoanMember" name="TermLoanMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" />
  <element id="aaoi_EastWestBankMember" name="EastWestBankMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" />
  <element name="DocumentAndEntityInformationAbstract" id="aaoi_DocumentAndEntityInformationAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <element name="InterimFinancialStatementsPolicyTextBlock" id="aaoi_InterimFinancialStatementsPolicyTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <element name="NumeratorAbstract" id="aaoi_NumeratorAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <element name="DenominatorAbstract" id="aaoi_DenominatorAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <element id="aaoi_NetIncomeLossPerShareAbstract" name="NetIncomeLossPerShareAbstract" nillable="true" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" />
  <element name="RestrictedCashAndCashEquivalentsFairValueDisclosure" id="aaoi_RestrictedCashAndCashEquivalentsFairValueDisclosure" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" />
  <element id="aaoi_EastWestAndComericaMember" name="EastWestAndComericaMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" />
  <element id="aaoi_ChaileaseFinanceCoMember" name="ChaileaseFinanceCoMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" />
  <element id="aaoi_ConstructionLoan1Member" name="ConstructionLoan1Member" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" />
  <element id="aaoi_WindfallTaxBenefitsUnrecognized" name="WindfallTaxBenefitsUnrecognized" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="credit" />
  <element name="WeightedAverageSharePriceOnDateOfExercise" id="aaoi_WeightedAverageSharePriceOnDateOfExercise" type="num:perShareItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <element name="WeightedAverageFairValueAbstract" id="aaoi_WeightedAverageFairValueAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <element id="aaoi_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedOptionsExcerciseWeightedAverageGrantDateFairValue" name="SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedOptionsExcerciseWeightedAverageGrantDateFairValue" nillable="true" type="num:perShareItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element name="AggregateIntrinsicValueAbstract" id="aaoi_AggregateIntrinsicValueAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeitedInPeriodTotalIntrinsicValue" id="aaoi_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeitedInPeriodTotalIntrinsicValue" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <element id="aaoi_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedOptionsExericsableWeightedAverageGrantDateFairValue2" name="SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedOptionsExericsableWeightedAverageGrantDateFairValue2" nillable="true" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element name="WeightedAverageFairValueVestedAndExpectedToVest2" id="aaoi_WeightedAverageFairValueVestedAndExpectedToVest2" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <element name="WeightedAverageSharePriceOnDateOfRelease" id="aaoi_WeightedAverageSharePriceOnDateOfRelease" type="num:perShareItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <element name="SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueGranted" id="aaoi_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueGranted" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <element name="SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueReleased" id="aaoi_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueReleased" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <element name="SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueCancelled" id="aaoi_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueCancelled" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <element id="aaoi_AggregateIntrinsicValueOtherThanOptionsExercisable" name="AggregateIntrinsicValueOtherThanOptionsExercisable" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="debit" />
  <element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOtherThanOptionsVestedAndExpectedToVestExercisableAggregateIntrinsicValue" id="aaoi_ShareBasedCompensationArrangementByShareBasedPaymentAwardOtherThanOptionsVestedAndExpectedToVestExercisableAggregateIntrinsicValue" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" />
  <element id="aaoi_AtmOfferingMember" name="AtmOfferingMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" />
  <element id="aaoi_MaturityDatesRangingFromJanuary2016ToJune2016Member" name="MaturityDatesRangingFromJanuary2016ToJune2016Member" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" />
  <element id="aaoi_NumberOfIncentivePlans" name="NumberOfIncentivePlans" nillable="true" type="xbrli:integerItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="aaoi_PercentageOfSharesOnWhichOptionIsExercisable" name="PercentageOfSharesOnWhichOptionIsExercisable" nillable="true" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="aaoi_OptionsExpirationPeriod" name="OptionsExpirationPeriod" nillable="true" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="aaoi_IntangibleAssetsNetExcludingGoodwilAndLandUseRights" name="IntangibleAssetsNetExcludingGoodwilAndLandUseRights" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="debit" />
  <element id="aaoi_OneMonthLiborRateMember" name="OneMonthLiborRateMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" />
  <element id="aaoi_FinanceLease2Member" name="FinanceLease2Member" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="aaoi_FinanceLease1Member" name="FinanceLease1Member" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="aaoi_PropertyPlantAndEquipmentNetBeforeConstructionInProgressAndLandComponents" name="PropertyPlantAndEquipmentNetBeforeConstructionInProgressAndLandComponents" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="debit" />
  <element id="aaoi_OtherNonoperatingIncomeExpenseOther" name="OtherNonoperatingIncomeExpenseOther" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="credit" />
  <element id="aaoi_CashPaidForReceivedFrom" name="CashPaidForReceivedFrom" nillable="true" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" />
  <element id="aaoi_TermLoan3Member" name="TermLoan3Member" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="aaoi_SecondAtmOfferingMember" name="SecondAtmOfferingMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="aaoi_PurchaseAndSaleContractAndFinanceLeaseAgreementMember" name="PurchaseAndSaleContractAndFinanceLeaseAgreementMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="aaoi_SaleLeasebackTransactionInitialPaymentMade" name="SaleLeasebackTransactionInitialPaymentMade" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="credit" />
  <element id="aaoi_FinanceLeaseTermOfContract" name="FinanceLeaseTermOfContract" nillable="true" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="aaoi_AgreementTerminationAmount" name="AgreementTerminationAmount" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" />
  <element id="aaoi_AccountingStandardsUpdate201609Member" name="AccountingStandardsUpdate201609Member" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="aaoi_EquipmentTermLoanMember" name="EquipmentTermLoanMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" />
  <element id="aaoi_DrawDownPeriod" name="DrawDownPeriod" nillable="true" type="us-types:durationStringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="aaoi_AmortizationPeriod" name="AmortizationPeriod" nillable="true" type="us-types:durationStringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="aaoi_ModificationAgreementMember" name="ModificationAgreementMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" />
  <element id="aaoi_SecondModificationMember" name="SecondModificationMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" />
  <element id="aaoi_FirstAmendmentMember" name="FirstAmendmentMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" />
</schema>
